TCP SYN Sweep excessively shooting host (3030.0)

Hi all

We've recently added a bunch of IP addresses to our internal networks (we initially only had them on the perimeter). As we implemented these IPS (running 5.x), we have seen a massive increase in the number of TCP SYN host sweep.

I looked a little further into the traffic, and it seems that much of this is traffic to port 80 on the external addresses (I'm guessing that its Web sites with ads, etc. that are originally most of these).

However, there are a lot of connections will apparently arbitrary ports to many different beaches of network. The part that worries me the most, is that a lot of the SYN scans addresses to internal AND external.

I could not determine the exact cause of the SYN scans, but it seems that the majority of our customers do.

I'm only a student, so my knowledge (and access to knowledge) are rather limited.

I was wondering if someone at - he had similar experiences? If so, is there a good way to eliminate false positives since potentially important alerts?

Best regards

Ryan

We use Intellitactics NSM as our SEM and it works very well for our environment (because it is relatively soft and we like to tinker).

I don't remember the exact changes we did, but that's what we have:

#sh conf | Start 3030

signatures 3030 0

scanning engine

50 unique

Tcp protocol

storage Axxb key

Specify-port-range Yes

1-24,26-79,81-442,444-2966,2968-65534 port range

The part of this signature working for us, it's that our platform (NSM) will create an alert when we see 100 of these signatures in a given period of time. That lets us know that some scanning time is underway (note that servers HTTP, DNS, FTP & busy will trigger this sig on back so filtering traffic & profiling is important).

Tags: Cisco Security

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    MTU 1500 dmz

    MTU 1500 wireless

    local pool VPN_DHCP 192.168.72.220 - 192.168.72.235 255.255.255.0 IP mask

    mask 192.168.75.1 - 192.168.75.50 255.255.255.0 IP local pool VPN_Range_2

    no failover

    ICMP unreachable rate-limit 1 burst-size 1

    ICMP allow any inside

    ICMP allow all outside

    ASDM image disk0: / asdm - 613.bin

    don't allow no asdm history

    ARP timeout 14400

    Global 1 interface (outside)

    NAT (inside) 0 access-list sheep

    NAT (inside) 1 0.0.0.0 0.0.0.0

    NAT (wireless) 1 192.168.40.0 255.255.255.0

    public static tcp (indoor, outdoor) interface smtp smtp Mailsrv_Pearle_Europe netmask 255.255.255.255

    public static tcp (indoor, outdoor) interface ftp ftp netmask 255.255.255.255 Pearle-DC02

    public static 990 Pearle-DC02 990 netmask 255.255.255.255 interface tcp (indoor, outdoor)

    static (inside, outside) tcp 3389 3389 Mailsrv_Pearle_Europe netmask 255.255.255.255 interface

    public static tcp (indoor, outdoor) interface www Pearle-DC02 www netmask 255.255.255.255

    public static 40200 Pearle-DC02 40200 netmask 255.255.255.255 interface tcp (indoor, outdoor)

    public static tcp (indoor, outdoor) interface https Exchange2010 https netmask 255.255.255.255

    public static tcp (indoor, outdoor) interface h323 h323 LifeSize-PE-HQ netmask 255.255.255.255

    public static 60000 60000 LifeSize-PE-HQ netmask 255.255.255.255 interface tcp (indoor, outdoor)

    public static 60001 LifeSize-PE-HQ 60001 netmask 255.255.255.255 interface tcp (indoor, outdoor)

    public static 60002 LifeSize-PE-HQ 60002 netmask 255.255.255.255 interface tcp (indoor, outdoor)

    public static 60003 LifeSize-PE-HQ 60003 netmask 255.255.255.255 interface tcp (indoor, outdoor)

    public static 60004 LifeSize-PE-HQ 60004 netmask 255.255.255.255 interface tcp (indoor, outdoor)

    public static 60005 LifeSize-PE-HQ 60005 netmask 255.255.255.255 interface tcp (indoor, outdoor)

    public static 60006 LifeSize-PE-HQ 60006 netmask 255.255.255.255 interface tcp (indoor, outdoor)

    public static 60007 LifeSize-PE-HQ 60007 netmask 255.255.255.255 interface tcp (indoor, outdoor)

    public static 60008 LifeSize-PE-HQ 60008 netmask 255.255.255.255 interface tcp (indoor, outdoor)

    public static 60009 LifeSize-PE-HQ 60009 netmask 255.255.255.255 interface tcp (indoor, outdoor)

    public static (inside, outside) udp interface 60001 LifeSize-PE-HQ 60001 netmask 255.255.255.255

    public static (inside, outside) udp interface 60002 LifeSize-PE-HQ 60002 netmask 255.255.255.255

    public static (inside, outside) udp interface 60003 LifeSize-PE-HQ 60003 netmask 255.255.255.255

    public static (inside, outside) udp interface 60004 LifeSize-PE-HQ 60004 netmask 255.255.255.255

    public static (inside, outside) udp interface 60005 LifeSize-PE-HQ 60005 netmask 255.255.255.255

    public static (inside, outside) udp interface 60006 LifeSize-PE-HQ 60006 netmask 255.255.255.255

    public static (inside, outside) udp interface 60007 LifeSize-PE-HQ 60007 netmask 255.255.255.255

    public static (inside, outside) udp interface 60008 LifeSize-PE-HQ 60008 netmask 255.255.255.255

    public static (inside, outside) udp interface 60009 LifeSize-PE-HQ 60009 netmask 255.255.255.255

    public static (inside, outside) udp interface 60010 LifeSize-PE-HQ 60010 netmask 255.255.255.255

    public static (inside, outside) udp interface 60011 LifeSize-PE-HQ 60011 netmask 255.255.255.255

    public static (inside, outside) udp interface 60012 LifeSize-PE-HQ 60012 netmask 255.255.255.255

    public static (inside, outside) udp interface 60013 LifeSize-PE-HQ 60013 netmask 255.255.255.255

    public static (inside, outside) udp interface 60014 LifeSize-PE-HQ 60014 netmask 255.255.255.255

    public static (inside, outside) udp interface 60015 LifeSize-PE-HQ 60015 netmask 255.255.255.255

    public static (inside, outside) udp interface 60016 LifeSize-PE-HQ 60016 netmask 255.255.255.255

    public static (inside, outside) udp interface 60017 LifeSize-PE-HQ 60017 netmask 255.255.255.255

    public static (inside, outside) udp interface 60018 LifeSize-PE-HQ 60018 netmask 255.255.255.255

    public static (inside, outside) udp interface 60019 LifeSize-PE-HQ 60019 netmask 255.255.255.255

    public static (inside, outside) udp interface 60020 LifeSize-PE-HQ 60020 netmask 255.255.255.255

    public static (inside, outside) udp interface 60021 60021 LifeSize-PE-HQ netmask 255.255.255.255

    public static (inside, outside) udp interface 60022 LifeSize-PE-HQ 60022 netmask 255.255.255.255

    public static (inside, outside) udp interface 60023 LifeSize-PE-HQ 60023 netmask 255.255.255.255

    public static (inside, outside) udp interface 60024 LifeSize-PE-HQ 60024 netmask 255.255.255.255

    public static (inside, outside) udp interface 60025 LifeSize-PE-HQ 60025 netmask 255.255.255.255

    public static (inside, outside) udp interface 60026 LifeSize-PE-HQ 60026 netmask 255.255.255.255

    public static (inside, outside) udp interface 60027 LifeSize-PE-HQ 60027 netmask 255.255.255.255

    public static (inside, outside) udp interface 60028 LifeSize-PE-HQ 60028 netmask 255.255.255.255

    public static (inside, outside) udp interface 60029 LifeSize-PE-HQ 60029 netmask 255.255.255.255

    public static (inside, outside) udp interface 60030 LifeSize-PE-HQ 60030 netmask 255.255.255.255

    public static (inside, outside) udp interface 60031 LifeSize-PE-HQ 60031 netmask 255.255.255.255

    public static (inside, outside) udp interface 60032 LifeSize-PE-HQ 60032 netmask 255.255.255.255

    public static (inside, outside) udp interface 60033 LifeSize-PE-HQ 60033 netmask 255.255.255.255

    public static (inside, outside) udp interface 60034 LifeSize-PE-HQ 60034 netmask 255.255.255.255

    public static (inside, outside) udp interface 60035 LifeSize-PE-HQ 60035 netmask 255.255.255.255

    public static (inside, outside) udp interface 60036 LifeSize-PE-HQ 60036 netmask 255.255.255.255

    public static (inside, outside) udp interface 60037 LifeSize-PE-HQ 60037 netmask 255.255.255.255

    public static (inside, outside) udp interface 60038 LifeSize-PE-HQ 60038 netmask 255.255.255.255

    public static (inside, outside) udp interface 60039 LifeSize-PE-HQ 60039 netmask 255.255.255.255

    public static (inside, outside) udp interface 60040 60040 LifeSize-PE-HQ netmask 255.255.255.255

    public static Mailsrv_Pearle_Europe 7472 netmask 255.255.255.255 7472 interface tcp (indoor, outdoor)

    public static LanSweep-XP netmask 255.255.255.255 8001 8001 interface tcp (indoor, outdoor)

    public static 8002 8002 LanSweep-XP netmask 255.255.255.255 interface tcp (indoor, outdoor)

    public static LanSweep-XP netmask 255.255.255.255 8003 8003 interface tcp (indoor, outdoor)

    static (inside, outside) 193.173.12.194 tcp https Pearle-DC02 https netmask 255.255.255.255

    inside_access_in access to the interface inside group

    Access-group outside_access_in in interface outside

    Access-group Wireless_access_in in wireless interface

    Route outside 0.0.0.0 0.0.0.0 193.173.12.206 1

    Route outside OracleThree 255.255.224.0 193.173.12.198 1

    Route outside 143.47.128.0 255.255.240.0 193.173.12.198 1

    Route inside 172.27.0.0 255.255.255.0 Pearle-DC02 1

    Timeout xlate 03:00

    Timeout conn 01:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02

    Sunrpc timeout 0:10:00 h323 0:05:00 h225 mgcp from 01:00 0:05:00 mgcp-pat 0:05:00

    Sip timeout 0:30:00 sip_media 0:02:00 prompt Protocol sip-0: 03:00 sip - disconnect 0:02:00

    Timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute

    dynamic-access-policy-registration DfltAccessPolicy

    AAA authentication LOCAL telnet console

    the ssh LOCAL console AAA authentication

    Enable http server

    http 192.168.40.0 255.255.255.0 Wireless

    http 192.168.1.0 255.255.255.0 inside

    http 192.168.72.0 255.255.255.0 inside

    http GrandVisionSoesterberg 255.255.255.0 inside

    SNMP-server host inside 192.168.33.29 survey community public version 2 c

    location of Server SNMP Schiphol

    contact Server SNMP SSmeekes

    SNMP-Server Public community

    Server enable SNMP traps snmp authentication linkup, linkdown cold start

    Crypto ipsec transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac

    Crypto ipsec transform-set ESP-DES-SHA esp - esp-sha-hmac

    Crypto ipsec transform-set ESP-DES-MD5 esp - esp-md5-hmac

    Crypto ipsec transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac

    Crypto ipsec transform-set ESP-3DES-MD5-esp-3des esp-md5-hmac

    Crypto ipsec transform-set ESP-AES-256-SHA 256 - aes - esp esp-sha-hmac

    Crypto ipsec transform-set ESP-AES-128-SHA aes - esp esp-sha-hmac

    Crypto ipsec transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac

    Crypto ipsec transform-set ESP-AES-128-MD5-esp - aes esp-md5-hmac

    Crypto ipsec transform-set esp-SHA-ESP-3DES-3des esp-sha-hmac

    Crypto ipsec transform-set esp-aes-256 GRANDVISION esp-md5-hmac

    life crypto ipsec security association seconds 28800

    Crypto ipsec kilobytes of life - safety 4608000 association

    Dynamic crypto map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set pfs

    Crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 value transform-set ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA MD5-ESP-3DES ESP-DES-SHA ESP-DES-MD5

    Dynamic crypto map SYSTEM_DEFAULT_CRYPTO_MAP 65535 define security association lifetime 28800 seconds

    cryptographic kilobytes 4608000 life of the set - the association of security of the 65535 SYSTEM_DEFAULT_CRYPTO_MAP of the dynamic-map

    card crypto outside_map0 1 match address outside_cryptomap_1

    outside_map0 card crypto 1jeu pfs

    outside_map0 card crypto 1jeu peer 212.78.223.182

    outside_map0 card crypto 1jeu transform-set ESP ESP-3DES-SHA-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-ESP ESP-3DES-MD5 MD5-DES-SHA ESP-DES-MD5

    outside_map0 map 1 lifetime of security association set seconds 28800 crypto

    card crypto outside_map0 1 set security-association life kilobytes 4608000

    card crypto game 2 outside_map0 address outside_cryptomap_2

    outside_map0 crypto map peer set 2 193.173.12.193

    card crypto outside_map0 2 game of transformation-ESP ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA ESP-3DES-MD5-DES-SHA ESP-DES-MD5

    life card crypto outside_map0 2 set security-association seconds 28800

    card crypto outside_map0 2 set security-association life kilobytes 4608000

    card crypto outside_map0 3 match address outside_1_cryptomap

    outside_map0 card crypto 3 set pfs

    outside_map0 card crypto 3 peers set 193.172.182.66

    outside_map0 crypto map 3 the value transform-set ESP-3DES-SHA

    life card crypto outside_map0 3 set security-association seconds 28800

    card crypto outside_map0 3 set security-association life kilobytes 4608000

    card crypto outside_map0 game 4 address outside_cryptomap

    outside_map0 card crypto 4 peers set 213.56.81.58

    outside_map0 4 set transform-set GRANDVISION crypto card

    life card crypto outside_map0 4 set security-association seconds 28800

    card crypto outside_map0 4 set security-association life kilobytes 4608000

    card crypto outside_map0 5 match address outside_cryptomap_3

    outside_map0 card crypto 5 set pfs

    outside_map0 crypto card 5 peers set 86.109.255.177

    outside_map0 card crypto 5 game of transformation-ESP ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA ESP-3DES-MD5-DES-SHA ESP-DES-MD5

    life card crypto outside_map0 5 set security-association seconds 28800

    card crypto outside_map0 5 set security-association life kilobytes 4608000

    Crypto map outside_map0 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP

    outside_map0 interface card crypto outside

    crypto ISAKMP allow inside

    crypto ISAKMP allow outside

    crypto ISAKMP enable dmz

    crypto ISAKMP enable wireless

    crypto ISAKMP policy 5

    preshared authentication

    3des encryption

    sha hash

    Group 2

    life 86400

    Telnet 192.168.72.0 255.255.255.0 inside

    Telnet timeout 5

    SSH 192.168.72.0 255.255.255.0 inside

    SSH GrandVisionSoesterberg 255.255.255.0 inside

    SSH 213.144.239.0 255.255.255.192 outside

    SSH timeout 5

    Console timeout 0

    management-access inside

    dhcpd dns 194.151.228.18 is 10.10.1.100

    dhcpd outside auto_config

    !

    dhcpd address 192.168.72.253 - 192.168.72.253 inside

    !

    dhcpd address dmz 192.168.50.10 - 192.168.50.50

    dhcpd enable dmz

    !

    dhcpd address wireless 192.168.40.10 - 192.168.40.99

    dhcpd dns 194.151.228.18 wireless interface

    dhcpd activate wireless

    !

    a basic threat threat detection

    host of statistical threat detection

    statistical threat detection port

    Statistical threat detection Protocol

    Statistics-list of access threat detection

    no statistical threat detection tcp-interception

    Group Policy "pearle_vpn_Hyp only" internal

    attributes of Group Policy "pearle_vpn_Hyp only".

    value of server WINS 192.168.72.25

    value of server DNS 192.168.72.25

    Protocol-tunnel-VPN IPSec l2tp ipsec

    Split-tunnel-policy tunnelspecified

    value of Split-tunnel-network-list SplittnlHyperion

    Split-dns value pearle.local

    internal pearle_vpn_OOD_only group policy

    attributes of the strategy of group pearle_vpn_OOD_only

    value of Split-tunnel-network-list SplittnlOOD

    internal pearle_vpn group policy

    attributes of the strategy of group pearle_vpn

    value of server WINS 192.168.72.25

    value of server DNS 192.168.72.25

    Protocol-tunnel-VPN IPSec l2tp ipsec svc

    Split-tunnel-policy tunnelspecified

    value of Split-tunnel-network-list splittunnelclientvpn

    Pearle.local value by default-field

    Split-dns value pearle.local

    username anyone password encrypted password

    username something conferred

    VPN-group-policy pearle_vpn_OOD_only

    type of remote access service

    tunnel-group 193 type ipsec-l2l

    tunnel-group 193 ipsec-attributes

    pre-shared-key *.

    tunnel-group 193.173.12.193 type ipsec-l2l

    IPSec-attributes tunnel-group 193.173.12.193

    pre-shared-key *.

    NOCHECK Peer-id-validate

    type tunnel-group pearle_vpn remote access

    tunnel-group pearle_vpn General-attributes

    address pool VPN_Range_2

    Group Policy - by default-pearle_vpn

    pearle_vpn group of tunnel ipsec-attributes

    pre-shared-key *.

    type tunnel-group Pearle_VPN_2 remote access

    attributes global-tunnel-group Pearle_VPN_2

    address pool VPN_Range_2

    strategy-group-by default "pearle_vpn_Hyp only".

    IPSec-attributes tunnel-group Pearle_VPN_2

    pre-shared-key *.

    tunnel-group 213.56.81.58 type ipsec-l2l

    IPSec-attributes tunnel-group 213.56.81.58

    pre-shared-key *.

    tunnel-group 212.78.223.182 type ipsec-l2l

    IPSec-attributes tunnel-group 212.78.223.182

    pre-shared-key *.

    tunnel-group 86.109.255.177 type ipsec-l2l

    IPSec-attributes tunnel-group 86.109.255.177

    pre-shared-key *.

    !

    class-map inspection_default

    match default-inspection-traffic

    !

    !

    type of policy-card inspect dns preset_dns_map

    parameters

    message-length maximum 512

    Policy-map global_policy

    class inspection_default

    inspect the preset_dns_map dns

    inspect the ftp

    inspect h323 h225

    inspect the h323 ras

    inspect the rsh

    inspect the rtsp

    inspect the skinny

    inspect sunrpc

    inspect xdmcp

    inspect the sip

    inspect the netbios

    inspect the tftp

    inspect the pptp

    !

    global service-policy global_policy

    context of prompt hostname

    Cryptochecksum:7d4d9c7ca7c865d9e40f5d77ed1238eb

    : end

    ASDM image disk0: / asdm - 613.bin

    ASDM BESServer 255.255.255.255 inside location

    ASDM VPN_Pool_2 255.255.255.0 inside location

    ASDM OracleTwo 255.255.224.0 inside location

    ASDM OracleOne 255.255.240.0 inside location

    ASDM OracleThree 255.255.224.0 inside location

    ASDM location Exchange2010 255.255.255.255 inside

    ASDM location Grandvision 255.255.255.0 inside

    ASDM Grandvision2 255.255.255.240 inside location

    ASDM Grandvision3 255.255.255.0 inside location

    ASDM Grandvision4 255.255.255.255 inside location

    ASDM GrandVision_PC 255.255.255.255 inside location

    ASDM location LanSweep-XP 255.255.255.255 inside

    ASDM GrandVisionSoesterberg 255.255.255.0 inside location

    ASDM location Pearle-DC02 255.255.255.255 inside

    ASDM location Pearle-WDS 255.255.255.255 inside

    ASDM location Swabach 255.255.255.0 inside

    ASDM GrandVisionSoesterberg2 255.255.255.0 inside location

    don't allow no asdm history

    Where is that host (inethost)? Inside of the ASA, or on the internet (on the outside)?

    If it is outside, you must configure the NAT for the pool of vpn as you turn on the SAA.

    NAT (outside) 1 192.168.75.0 255.255.255.0

  • TCP Hijack on IDS signature

    Someone has a lot of experience with the 'TCP Hijack' signature on the IDS sensors? I checked the NSDB and docs IDS for the engine in question, but neither go into details on how to determine if alerts are false or true positives.

    Any comments would be much appreciated.

    Thank you very much

    Matt

    Under the version of Cisco IDS 3.x, Hamid 3250 only looked at a few ports (TCP 21, 23, 513 and 514, if I remember correctly).

    With the introduction of version 4.x, the signature was no longer limited to these ports. Thus, at least here, we were see a large number of "false positives" involving the web proxy traffic and NetBIOS traffic. BTW, I have no idea if the signature has been coupled to the ports under version 5.x (someone?).

    The logic that we apply to all alarm hamid 3250 we see here is based on two factors: intent and feasibility.

    Although it is theoretically possible to divert most oriented session TCP connections between a client and a server, there are some that simply make no sense.

    If you take alarms involving TCP port 80, what would be the point to divert someone connecting to a web server? Anything sensitive that someone could do this using a browser is done via HTTPS (SSL/TLS aka), so Cryptography will eliminate the threat of hijacking it. So now you re left with web access unsecure. what you are more likely to find if divert you this? Someone looking at the comic strip Dilbert, or something as I imagine... I think you will agree that, therefore, there is no intention at all.

    As with any attack of diversion, the feasibility is quite low. Most of these attacks requires that the hijacker be in the same domain as the intended victim. That being said, it goes without saying that you aren t also see cache poisoning attacks ARP or TCP Syn flooding (or another DoS attack against the victim), you aren t see a valid hijack alarm. Of course, the problem here is that these activities usually occur in an area that is not supervised by a NIDS, then you will need other corroborating data to see (HIDS/NNIDS, router logs).

    In all cases, these alarms are not very useful on their own. When they become valuable, in my opinion, is when they appear in concert with other alarms (e.g. Hamid 7105 - imbalance of ARP requests).

    I hope this helps.

    Alex Arndt

  • Reset TCP question

    I have a question about the TCP/IP communication. Let's say I have a device cisco running with off http server. If I send a TCP syn packet to the device with the port of destination 80/443(any non-listening port), the device responds by TCP RESET? Or it will simply fall package without any acknowledgement?

    I think it will be different from a device to:

    ASA will drop connection refused the services is not running, to do send reset use the command "resetoutside service" send reset to a TCP packet refused to the external interface.

    Default access points will reset

    Default routers will reset

    Default switches will reset

    Kind regards

    PS please rate and mark as right

  • ACE - probe on VIP sfarm TCP port failed

    Hello

    I noticed that AS addresses for TCP SYN sent by external device (in my example: GSS device) to the virtual IP address of a serverfarm is perfected OUTOFSERVICE - due to the failure rservers (ARP failed).

    A context is configured on the ACE module that is in bridge mode. VIP serverfarm is listening on a TCP port.

    Do you know why the AS sends TCP SYN ACK, even if all the rservers in the serverfarm are declining?

    How address this situation and to define the ACE to respond on these request only if VIP is ACTIVE because of the State CONTINUES to sfarm?

    Krzysztof salvation,

    What version of ACE are you running?

    When ACE meets the keepalive GSS what is the status of VIP (in-service or out-of-service) in show-service policy

    It could be a bug like the one below:

    CSCtz42618 VIP on port 443 accepts the connection when all real servers are down

    Kind regards

    Kanwal

  • Host Update Utility always useful to patch 4.1?

    So, apparently, that the host update utility provided with vSphere 4.0 client does not support upgrading a version 4.0.x of ESXi 4.1 and you must do so by vCLI for those of us who do not have vCenter. Fine.

    While it is a regular update patches? Currently, the host update utility seems to grind through a sweep of the host of a host 4.1 for a long time then says it is up to date, but it is not clear if this is because there is no update 4.1 out again, or he is simply lying because he made the version 4.0 updates checks only. If she is not really checked 4.1 updates, how users free regular ESXi without vCenter supposed to update and maintain their hosts? Is VMware we expected trolling through the downloads pages periodically to check if there is a new version of build manually update or expect that you subscribe to the explosion of e-mail complete VMware just so that we can update notifications?

    I posted a query similar to a return of the week, and although I've seen some answers, they only suggested that "no" was the answer.

    It is very frustrating - Update Manager is a pain in the butt and "cancel the job, restart your server, put in maintenance mode manually and try again", advice that I usually get, somewhat defeats all ideals "automatically patch your environment" Update Manager pushes.

    You can never vihostupdater.pl command-line if you were aware. Its a real pain.

  • Multiple TCP * extend Proxy

    Hello

    I'm developing a C++ Client for consistency and using the TCP protocol * Extend to connect to the Cache.

    I am able to run multiple nodes on the same machine.

    My goal is to add more machines to this configuration (is another machine called cluster or node?).


    I would like to have a configuration as explained below:

    NamedCache: AQRCache
    Cache Type: Close cover (Local and distributed/remote)

    HOST_A:
    TCP * extend A
    Node 1
    Node 2

    C++customera performer on Host_A talk to TCP * Extend_A.


    HOST_B:
    TCP * extend_B
    Node 3
    Node 4

    C++clientrunning on Host_B B talk to TCP * Extend_B.


    Host_C:
    TCP * extend_C
    Node 5
    Node 6

    C++clientC running on Host_C talk to TCP * Extend_C.


    Other Clients in C++:

    C++clientrunning on Host_D talk to TCP * Extend_A.
    C++clientE running on Host_E talk to TCP * Extend_A.
    C++clientF running on Host_F talk to TCP * Extend_A.


    Issues related to the:

    1. to add more machines, if I am running an instance on another machine with the same configuration file, it will work?

    2. is it possible to run separate TCP * Proxy extend on each host and it will be part of the same cluster?

    3 or should all customers C++ must talk to only TCP * extend Proxy?


    Thank you
    NS

    1. to add more machines, if I am running an instance on another machine with the same configuration file, it will work?

    Yes, you can add other machines/nodes using the same configuration file.

    2. is it possible to run separate TCP * Proxy extend on each host and it will be part of the same cluster?

    Yes, you can run several proxy nodes in a single cluster. Just about every production cluster has several proxy nodes.

    3 or should all customers C++ must talk to only TCP * extend Proxy?

    No, there is no reason to force all C++ clients to connect to a single proxy. In fact you might consider to configure each client with the complete list of proxy servers. Each customer is going to randomly select a server to connect, ensuring that a single proxy is not overloaded.

    Also take a look at this document: http://coherence.oracle.com/display/COH35UG/Best+Practices+for+Coherence+Extend

    Thank you
    Patrick

  • What are the causes an IP internal to "attack" multiple public IP addresses?

    We had to many TCP SYN host sweep. Could someone share what could cause the above? Follow copies of the alert details.

    evIdsAlert: eventId = 1216742775473866070 = severity = informational Cisco vendor

    Author:

    hostId: ips

    appName: sensorApp

    appInstanceId: 403

    time: August 8, 2008 19:18:53 UTC offset = 480 timeZone = GMT-08:00

    signature: description = TCP SYN host Sweep id = 3030 = S2 version

    subsigId: 0

    marsCategory: probe/SpecificPorts

    interfaceGroup: vs0

    VLAN: 0

    participants:

    striker:

    addr: 172.16.5.111 locality = OUT

    Port: 3958

    target:

    addr: 69.63.178.11 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 64.62.193.70 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 77.67.127.41 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 64.215.162.27 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 65.55.15.242 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 77.67.127.10 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 69.63.176.167 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 65.242.27.32 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 64.209.118.140 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 77.67.127.25 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 207.200.64.225 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 207.68.179.219 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 65.55.13.158 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 63.217.8.128 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 66.151.244.212 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    target:

    addr: 207.200.64.161 locality = OUT

    OS: idSource = unknown type = unknown = relevant

    alertDetails: InterfaceAttributes: = 'Unknown' physical context = 'Unknown' bottom of basket = "GigabitEthernet0/1 ';

    riskRatingValue: 31 targetValueRating = average attackRelevanceRating = relevant

    threatRatingValue: 31

    Interface: GigabitEthernet0/1 context unknown physical = unknown = backplane = GigabitEthernet0/1

    Protocol: tcp

    Scans when detected on the network local are "mostly" false positives, that's the official word from Cisco:

    http://Tools.Cisco.com/Security/Center/viewIpsSignature.x?signatureId=3030&signatureSubId=0&softwareVersion=6.0&releaseVersion=S2

    "Benign triggers.

    Scan host 3030 and 3032 signatures detect behaviors that cannot be observed from sources outside the local network, but are normal behaviors for sources within the local network. »

    You can filter these signatures of the LAN hosts using event Action filters or tune the signature (using the source / dest. fields inside).

    Concerning

    Farrukh

  • Cisco IOS 12.3.5a vs IOS 12.3.3c

    I have an ongoing execution of 2621 IP address, firewall, IDS, and NAT I opened the appropriate ports to allow a PCAnywhere client via the host inside the firewall. It works fine on IOS 12.3.3c and below. The connection starts, but does not end when executing 12.3.5a. Is it a problem with Cisco plan police control which became available in the version of IOS 12.3.4T or more, or is there a bug in the 12.3.5 undocumented code?

    There is a bug documented in 12.3 (5) with FW IOS does not allow connections initiated from outside to start to internal hosts. Basically the Firewall ignores the package of TCP SYN - ACK, returning from the inside, the host for the 3-way connection never ends. Initiated by inside outbound connections are not affected.

    Bug ID is CSCec78231, you can read about it here:

    http://www.Cisco.com/cgi-bin/support/Bugtool/onebug.pl?BugID=CSCec78231&submit=search

    Stick with 12.3 (3) at the moment, already should be resolved in 12.3 (6) when it comes out.

  • After upgrade no more VPNS to v3.6.3 (hub)

    Once we have updated version of 3.6.1 to 3.6.3 concentrator we are more able to set up a VPN session.

    Hereby the newspapers from the hub and the Cisco VPN Client.

    For security reasons, I replaced the following information:

    Concentrators c.c.c.c = IP address

    ISP of the assigned client IP = w.w.w.w.

    The client IP address assigned (from pool) Concentratot = internal g.g.g.g

    Primary DNS/WINS=D1.D1.D1.D1

    Secondary DNS/WINS=D2.D2.D2.D2

    Journal of the hub:

    2002-08-10 183 14:20:24.840 SEV = 5 IP/49 RPT = 5

    Transmitting station TCP SYN - ACK to client.w, port TCP dest 1677 pkt

    10/08/2002 184 14:20:24.850 SEV = 5 RPT IP/50 = 9

    Head of network TCP ACK from client.w, port TCP source 1677 pkt

    185 10/08/2002 14:20:24.890 SEV = 5 RPT IP/50 = 10

    Head of network TCP ACK from client.w, port TCP source 1677 pkt

    186 10/08/2002 14:20:25.190 SEV = 5 RPT IP 41 = 5

    Established client.w, the TCP source 1677 port TCP session.

    188 10/08/2002 14:20:37.170 SEV = 4 RPT IKE/52 = 5.w

    User group [TestGroup] [testuser]

    (Testuser) user authenticated.

    10/08/2002 189 14:20:37.280 SEV = 5 RPT IKE/184 = 5.w

    User group [TestGroup] [testuser]

    Client OS: Windows NT

    The client Application version: 3.6.2 (Rel) of

    192 10/08/2002 14:20:37.620 SEV = 4 RPT IKE/119 = 5.w

    User group [TestGroup] [testuser]

    PHASE 1 IS COMPLETE

    2002-08-10 193 14:20:37.630 SEV = 5 RPT IKE/25 = 5.w

    User group [TestGroup] [testuser]

    Data received from the Proxy host remote ID supported:

    Address g.g.g.g, protocol 0, Port 0

    196-10/08/2002 14:20:37.630 SEV = 5 RPT IKE/24 = 5.w

    User group [TestGroup] [testuser]

    Data received from the Proxy host local ID supported:

    Address c.c.c.c, protocol 0, Port 0

    199-10/08/2002 14:20:37.630 SEV = 5 RPT IKE/66 = 5.w

    User group [TestGroup] [testuser]

    Remote peer IKE configured for SA: ESP-AES128-SHA

    201 10/08/2002 14:20:37.630 SEV = IKE/0 4 RPT = 5.w

    User group [TestGroup] [testuser]

    All the proposals of the IPSec Security Association has deemed unacceptable!

    202-10/08/2002 14:20:37.630 SEV = 4. RPT = 5 IKEDBG/0

    Error of QM WSF (P2 struct & 0x1d150bc, mess id 0xbac8f29).

    203-10/08/2002 14:20:37.630 SEV = 4 IKEDBG/65 RPT = 5.w

    User group [TestGroup] [testuser]

    History of mistake IKE responder QM WSF (struct & 0x1d150bc)

    , :

    QM_DONE, EV_ERROR

    QM_BLD_MSG2, EV_NEGO_SA

    QM_BLD_MSG2, EV_IS_REKEY

    QM_BLD_MSG2, EV_CONFIRM_SA

    209 10/08/2002 14:20:37.640 SEV = 5 IP/43 RPT = 5

    Remove entry TCP peripheral pour.w IDE oucederomsurlesecondport 1677

    Journal of the client:

    5 14:20:24.786 08/10/02 Sev = Info/6 DIALER / 0 x 63300002

    Start the connection.

    6 14:20:24.796 08/10/02 Sev = Info/4 CM / 0 x 63100002

    Start the login process

    7 14:20:24.796 08/10/02 Sev = Info/4 CM / 0 x 63100004

    Establish a connection using Ethernet

    8 14:20:24.796 08/10/02 Sev = Info/4 CM / 0 x 63100026

    Attempt to connect with the server "c.c.c.c.

    9 14:20:24.796 10/08/02 Sev = Info/6 CM / 0 x 63100033

    Awarded the local TCP port 1677 for the TCP connection.

    10 14:20:24.866 10/08/02 Sev = Info/4 CM/0x6310002D

    TCP connection on port 10001 with Server "c.c.c.c.

    11 14:20:24.996 08/10/02 Sev = Info/4 CM / 0 x 63100026

    Attempt to connect with the server "c.c.c.c.

    12 14:20:24.996 08/10/02 Sev = Info/6 IKE/0x6300003B

    Try to establish a connection with c.c.c.c.

    13 14:20:25.017 08/10/02 Sev = Info/4 IKE / 0 x 63000013

    SEND to > ISAKMP OAK AG (SA, KE, NO, ID, VID, VID, VID) to c.c.c.c

    14 14:20:25.347 08/10/02 Sev = Info/6 IPSEC/0x6370001F

    TCP SYN sent to c.c.c.c, src port 1677, port dst 10001

    15 14:20:25.347 08/10/02 Sev = Info/6 IPSEC/0x6370001C

    TCP SYN - ACK received from c.c.c.c, src port 10001, port dst 1677

    16 14:20:25.347 08/10/02 Sev = Info/6 IPSEC / 0 x 63700020

    TCP ACK sent c.c.c.c, src port 1677, port dst 10001

    17 14:20:25.347 08/10/02 Sev = Info/4 IPSEC / 0 x 63700014

    Remove all keys

    18 14:20:25.597 08/10/02 Sev = Info/5 IKE/0x6300002F

    Received packet of ISAKMP: peer = c.c.c.c

    19 14:20:25.597 08/10/02 Sev = Info/4 IKE / 0 x 63000014

    RECEIVING< isakmp="" oak="" ag="" (sa,="" ke,="" non,="" id,="" hash,="" vid,="" vid,="" vid,="" vid,="" vid)="" from="">

    20 14:20:25.597 08/10/02 Sev = Info/5 IKE / 0 x 63000059

    Useful load Vendor ID = 12F5F28C457168A9702D9FE274CC0100

    21 14:20:25.597 08/10/02 Sev = Info/5 IKE / 0 x 63000001

    Peer is a compatible peer Cisco-Unity

    22 14:20:25.597 08/10/02 Sev = Info/5 IKE / 0 x 63000059

    Useful load Vendor ID = 09002689DFD6B712

    23 14:20:25.597 08/10/02 Sev = Info/5 IKE / 0 x 63000001

    Peer supports XAUTH

    24 14:20:25.597 08/10/02 Sev = Info/5 IKE / 0 x 63000059

    Useful load Vendor ID = AFCAD71368A1F1C96B8696FC77570100

    25 14:20:25.597 08/10/02 Sev = Info/5 IKE / 0 x 63000001

    Peer supports the DPD

    26 14:20:25.597 08/10/02 Sev = Info/5 IKE / 0 x 63000059

    Useful load Vendor ID = 4048B7D56EBCE88525E7DE7F00D6C2D3C0000000

    27 14:20:25.597 10/08/02 Sev = Info/5 IKE / 0 x 63000059

    Useful load Vendor ID = 1F07F70EAA6514D3B0FA96542A500306

    28 14:20:25.617 08/10/02 Sev = Info/4 IKE / 0 x 63000013

    SEND to > ISAKMP OAK AG * (HASH, NOTIFY: STATUS_INITIAL_CONTACT) to c.c.c.c

    29 14:20:25.778 08/10/02 Sev = Info/5 IKE/0x6300002F

    Received packet of ISAKMP: peer = c.c.c.c

    30 14:20:25.778 08/10/02 Sev = Info/4 IKE / 0 x 63000014

    RECEIVING< isakmp="" oak="" trans="" *(hash,="" attr)="" from="">

    31 14:20:25.778 08/10/02 Sev = Info/4 CM / 0 x 63100015

    Launch application xAuth

    32 14:20:34.671 08/10/02 Sev = Info/4 CM / 0 x 63100017

    xAuth application returned

    33 14:20:34.671 08/10/02 Sev = Info/4 IKE / 0 x 63000013

    SEND to > ISAKMP OAK TRANS *(HASH, ATTR) to c.c.c.c

    34 14:20:37.194 08/10/02 Sev = Info/5 IKE/0x6300002F

    Received packet of ISAKMP: peer = c.c.c.c

    35 14:20:37.194 08/10/02 Sev = Info/4 IKE / 0 x 63000014

    RECEIVING< isakmp="" oak="" trans="" *(hash,="" attr)="" from="">

    36 14:20:37.194 08/10/02 Sev = Info/4 CM/0x6310000E

    ITS established Phase 1. 1. ITS phase 1 in the system

    37 14:20:37.194 08/10/02 Sev = Info/4 IKE / 0 x 63000013

    SEND to > ISAKMP OAK TRANS *(HASH, ATTR) to c.c.c.c

    38 14:20:37.204 08/10/02 Sev = Info/5 IKE/0x6300005D

    Customer address a request from firewall to hub

    39 14:20:37.204 08/10/02 Sev = Info/5 IKE/0x6300005C

    Firewall policy: product = Cisco integrated customer, capacity = (centralized Protection Policy).

    40 14:20:37.214 08/10/02 Sev = Info/4 IKE / 0 x 63000013

    SEND to > ISAKMP OAK TRANS *(HASH, ATTR) to c.c.c.c

    41 14:20:37.375 08/10/02 Sev = Info/5 IKE/0x6300002F

    Received packet of ISAKMP: peer = c.c.c.c

    42 14:20:37.375 08/10/02 Sev = Info/4 IKE / 0 x 63000014

    RECEIVING< isakmp="" oak="" trans="" *(hash,="" attr)="" from="">

    43 14:20:37.375 08/10/02 Sev = Info/5 IKE / 0 x 63000010

    MODE_CFG_REPLY: Attribute = INTERNAL_IPV4_ADDRESS:, value = g.g.g.g

    44 14:20:37.375 10/08/02 Sev = Info/5 IKE / 0 x 63000010

    MODE_CFG_REPLY: Attribute = INTERNAL_IPV4_DNS (1):, value = d1.d1.d1.d1

    45 14:20:37.375 08/10/02 Sev = Info/5 IKE / 0 x 63000010

    MODE_CFG_REPLY: Attribute = INTERNAL_IPV4_DNS (2):, value = d2.d2.d2.d2

    46 14:20:37.375 08/10/02 Sev = Info/5 IKE / 0 x 63000010

    MODE_CFG_REPLY: Attribute = INTERNAL_IPV4_NBNS (1) (a.k.a. WINS):, value = d1.d1.d1.d1

    47 14:20:37.375 08/10/02 Sev = Info/5 IKE / 0 x 63000010

    MODE_CFG_REPLY: Attribute = INTERNAL_IPV4_NBNS (2) (a.k.a. WINS):, value = d2.d2.d2.d2

    48 14:20:37.375 08/10/02 Sev = Info/5 IKE/0x6300000E

    MODE_CFG_REPLY: Attribute = MODECFG_UNITY_BANNER, value = WARNING:

    Any use of this system may be recorded or monitored without further notice, and newspapers that results can be used as evidence in court.

    If you are not authorized to use this system disconnect now!

    49 14:20:37.375 08/10/02 Sev = Info/5 IKE/0x6300000D

    MODE_CFG_REPLY: Attribute = MODECFG_UNITY_SAVEPWD:, value = 0x00000000

    50 14:20:37.375 08/10/02 Sev = Info/5 IKE/0x6300000D

    MODE_CFG_REPLY: Attribute = MODECFG_UNITY_PFS:, value = 0x00000000

    51 14:20:37.375 08/10/02 Sev = Info/5 IKE/0x6300000E

    MODE_CFG_REPLY: Attribute = APPLICATION_VERSION, value = Cisco Systems, Inc. / VPN 3000 Concentrator Version 3.6.3.Rel created by vmurphy on October 4, 2002 16:23

    52 14:20:37.425 08/10/02 Sev = Info/4 CM / 0 x 63100019

    Data in mode Config received

    53 14:20:37.465 08/10/02 Sev = Info/5 IKE / 0 x 63000055

    Has received a request for Driver IP address c.c.c.c, GW IP = c.c.c.c key

    54 14:20:37.465 08/10/02 Sev = Info/4 IKE / 0 x 63000013

    SEND to > ISAKMP OAK QM * (HASH, SA, NO, ID, ID) to c.c.c.c

    55 14:20:37.465 08/10/02 Sev = Info/5 IKE / 0 x 63000055

    Received a key demand driver for IP 10.10.10.255, GW IP = c.c.c.c

    56 14:20:37.465 08/10/02 Sev = Info/4 IKE / 0 x 63000013

    SEND to > ISAKMP OAK QM * (HASH, SA, NO, ID, ID) to c.c.c.c

    57 14:20:37.675 08/10/02 Sev = Info/5 IKE/0x6300002F

    Received packet of ISAKMP: peer = c.c.c.c

    58 14:20:37.675 08/10/02 Sev = Info/4 IKE / 0 x 63000014

    RECEIVING< isakmp="" oak="" info="" *(hash,="" notify:status_resp_lifetime)="" from="">

    59 14:20:37.675 08/10/02 Sev = Info/5 IKE / 0 x 63000044

    Answering MACHINE-LIFE notify has value of 86400 seconds

    60 14:20:37.675 10/08/02 Sev = Info/5 IKE / 0 x 63000046

    This SA has already been living for 13 seconds, setting expiration 86387 seconds now

    61 14:20:37.705 08/10/02 Sev = Info/5 IKE/0x6300002F

    Received packet of ISAKMP: peer = c.c.c.c

    62 14:20:37.705 08/10/02 Sev = Info/4 IKE / 0 x 63000014

    RECEIVING< isakmp="" oak="" info="" *(hash,="" del)="" from="">

    63 14:20:37.705 08/10/02 Sev = Info/5 IKE/0x6300003C

    A receipt a payload to DELETE for IKE SA with Cookies = 2CDEFD1BD3EFB19215350D42094312B8

    64 14:20:37.705 08/10/02 Sev = Info/5 IKE / 0 x 63000017

    Marking of IKE SA delete (COOKIES = 2CDEFD1BD3EFB192 15350D42094312B8) reason = DEL_REASON_PEER_DELETION

    65 14:20:38.066 08/10/02 Sev = Info/4 IPSEC / 0 x 63700014

    Remove all keys

    66 14:20:38.066 08/10/02 Sev = Info/6 IPSEC/0x6370002B

    Sent packets of 6, 0 were fragmented.

    67 14:20:38.066 08/10/02 Sev = Info/6 IPSEC/0x6370001D

    TCP RST from c.c.c.c, src port 10001, port dst 1677

    68 14:20:38.366 08/10/02 Sev = Info/4 CM / 0 x 63100012

    ITS phase 1 deleted before first Phase 2 SA is caused by "DEL_REASON_PEER_DELETION". 0 ITS phase 1 currently in the system

    69 14:20:38.366 08/10/02 Sev = Info/5 CM / 0 x 63100029

    Initializing CVPNDrv

    70 14:20:38.366 08/10/02 Sev = Info/4 CM / 0 x 63100031

    Reset the TCP connection on port 10001

    71 14:20:38.366 08/10/02 Sev = Info/6 CM / 0 x 63100034

    Removed the local TCP port 1677 for the TCP connection.

    72 14:20:38.416 08/10/02 Sev = WARNING/3 DIALER/0xE3300008

    GI VPNStart callback doesn't have a 'CM_IKE_RECEIVED_DELETE_NOTIFICATION' (15 h).

    73 14:20:39.418 08/10/02 Sev = Info/4 IPSEC / 0 x 63700012

    Delete all keys associated with peer c.c.c.c

    74 14:20:39.418 08/10/02 Sev = Info/4 IPSEC / 0 x 63700012

    Delete all keys associated with peer c.c.c.c

    75 14:20:39.418 08/10/02 Sev = Info/6 IPSEC / 0 x 63700022

    TCP RST sent to c.c.c.c, src port 1677, port dst 10001

    76 14:20:39.418 08/10/02 Sev = Info/4 IPSEC / 0 x 63700014

    Remove all keys

    77 14:20:39.418 08/10/02 Sev = Info/6 IPSEC/0x6370002B

    Sent 4 packets, 0 were fragmented.

    When I look at the proposals of active IKE SA or configurations all seems ok (so everything worked fine with 3.6.1. Concentrator release).

    Any suggestion would be appreciated.

    Marcel

    OK, I tried it myself and ran into the same issue. AES seems to be broken in 3.6.3. A bug has been created (CSCdy88797) and will be corrected shortly, but for now, you need to use 3.6.1 or change the encryption algorithms if you simply use 3.6.3.

    Sorry about that.

  • Cisco AnyConnect SSL VPN

    Hi guys,.

    I am currently ut setting for the first time on a Cisco ASA 5505 Cisco AnyConnect SSL VPN.

    I enclose my topology.

    I ran the wizard of the ASDM on the ASA2 I want to use for my VPN connections.

    Everything works fine except that I can't access any internal computer servers on my network.

    I do a specific configuration because my servers have a different default gateway of the ASA that I use for my VPN?

    I have since the ASA2 the 192.168.10.0 network.

    my remote ip address of the pool is 10.0.0.1-10.0.0.10/24

    config (I've included what, in my view, is necessary, please let me know if you need to see more):

    ASA 2.0000 Version 8

    Sysopt connection permit VPN

    tunnel of splitting allowed access list standard 192.168.10.0 255.255.255.0

    network of the NETWORK_OBJ_10.0.0.0 object

    10.0.0.0 subnet 255.255.255.0

    NAT (inside, outside) static source any any static destination NETWORK_OBJ_10.0.0.0 NETWORK_OBJ_10.0.0.0 non-proxy-arp-search to itinerary

    internal GroupPolicy_vpn group strategy

    attributes of Group Policy GroupPolicy_vpn

    value of 192.168.10.20 WINS server

    value of server DNS 192.168.10.15

    client ssl-VPN-tunnel-Protocol ikev2

    Split-tunnel-policy tunnelspecified

    Split-tunnel-network-list value split tunnel

    domain.local value by default-field

    WebVPN

    User PROFILE of value type profiles AnyConnect

    type tunnel-group tunnel_vpn remote access

    tunnel-group tunnel_vpn General-attributes

    address ra_vpn_pool pool

    Group Policy - by default-GroupPolicy_vpn

    tunnel-group tunnel_vpn webvpn-attributes

    activation of the Group tunnel_vpn alias

    !

    Thanks in advance!

    Hello

    The unit behind your ASAs on the internal LAN should really be a router switch or L3 and not a basic L2 switch.

    You now have an asymmetric routing on your network, and this is the reason why the connection of the VPN device will not work.

    The problem comes from the fact that internal devices use the ASA1 for the default gateway. When trying to connect to the VPN Client, the following happens

    • Client VPN armed sends TCP SYN that happens by the VPN with the ASA2
    • ASA2 passes the TCP SYN to the server
    • Server responds with TCP SYN ACK for the VPN Client and sends this information to the ASA1 as the destination host is in another network (vpn pool)
    • ASA1 sees the TCP SYN ACK, but never saw the TCP SYN so he abandoned the connection.

    To work around the problem, you need to essentially configure TCP State Bypass on the ASA1 although I wouldn't really say that, but rather to change the configuration of the network so that traffic makes this way to start.

    An option, even if not the best, would be to set the LAN of the ASA2 to ASA1 on some physical ports and set up a new network connection between them (not the same 192.168.10.x/yy). In this way the ASA1 would see the entire conversation between servers and VPN Clients and there are no problems with the flow of traffic.

    But as I said it probably still isn't the best solution, but in my opinion better than having recourse to special configurations ASA1.

    There could be a 'special' configuration on the ASA2 that you could use to make the Client VPN connections operate in their current configuration, without changing anything in the physical topology.

    You can change the NAT for VPN Clients configuration so that the VPN ALL users would actually PATed to 192.168.10.4 IP address when they connect to your internal network. Given that the server would see the connection coming from the same network segment, they would know to forward traffic back with the ASA2 rather than ASA1 like her today.

    If this is not an ideal solution.

    No source (indoor, outdoor) nat static any any static destination NETWORK_OBJ_10.0.0.0 NETWORK_OBJ_10.0.0.0 non-proxy-arp-search to itinerary

    the object of the LAN network

    192.168.10.0 subnet 255.255.255.0

    NAT (exterior, Interior) 1 dynamic source NETWORK_OBJ_10.0.0.0 destination static LAN LAN interface

    Hope this helps

    -Jouni

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