ISAKMP for vpn
to my knowledge, I think that pix & asa allow ipsec to be attempted (or possibly put in place) from anywhere.
I read that, but could not understand what he entirely & there is no mention of avoid it.
If it does not attempt, can she really be established even if this peer is not mentioned in sets related ipsec vpn.
If there is such a condition, how can it be configured to accept ipsec still started from only a specific public source.
appreciate your help.
Thank you.
Hello
ASAs the PIX allow any source IPsec connections (if properly configured).
For example, as soon as the PIX / ASA is configured as a VPN IPsec server, it will allow connections from any source on the Internet.
I guess that since the main purpose of remote VPN access must be able to connect from anywhere, this is the behavior.
The ASAs now include an option to apply the ACL on the interface of traffic to employment (as well as the traffic through the box).
If you apply that ACL ISAKMP only from a certain IP address (or the refusal of certain IP,) then the ASA will follow this rule, but this is not often used because it defeats the purpose of being able to connect from anywhere.
The security normally applied for remote connections is through the name of user and password, OTP, digital certificates, etc. to validate the authenticity of the user trying to connect. In addition, you can use Secure Desktop to do a posture check of the remote device and allow connections only if certain conditions are met.
However, if you are referring to VPN Site to Site, the PIX / ASA allows only a valid counterpart (already configured IP) connections.
It will be useful.
Federico.
Tags: Cisco Security
Similar Questions
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Two links one for VPN Site to Site and another for internet on the same router configuration
Hi all
I have 2 internet links an ADSL and lease terminated on the same router. I need to configure ADSL for VPN site-to-site of HO and internet leased line dedicated for all users.
my site IP subnet is 10.10.100.0/24 and HO subnet is 10.1.0.0/24. Please find attached Config and advice it will be OK and works fine
Thanks in advance...
Mikael
Hello
For me, it looks like it has configured the route correctly;
ip route 0.0.0.0 0.0.0.0 fastethernet4 -> for all traffic to the internet.
Road 10.1.0.0 ip 255.255.255.0 Dialer1 -> for vpn traffic to HO.
The public_IP_HO must be defined according to the map of encryption using the set by the peers command.
I want to add is on the isakmp policy hash attribute, you can choose between sha/md5 or whatever available on your device. Make sure that the isakmp policy to match political isakmp of your HO.
The other thing is the acl for the internet. You may want to consider replacing the deny statement if you want to deny traffic only to your jar currently it is said to deny all traffic 10.10.100.0 10.0.0.0 network, not to the 10.1.0.0 HO (network).
HTH,
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The problem is that we use a non-standard port for the SSL VPN from 443 is already sent to an internal device. I have unused public addresses to the external interface of the ASA, but I don't know how I could use them. I would like to have a different IP address for SSL VPN, so I don't have to mess with the port forward that is currently in place. I read on proxy arp, but that looks like it could be a problem. I could have someone connect another cable to a different interface on the ASA (5512-X) and assign this static interface I want for the VPN, but I'm not sure it will work well. We have connections VPN site to site in place as well. Can I have the ASA listening on two different interfaces at the same time?
Recap:
IP 1 - address primary NAT, Site at tunnels put end here, some Cisco IPsec VPN terminate customer
IP 2 - want to have all customers of Anyconnect connect here, to migrate all legacy Cissco IPsec clients until they are all over Anyconnect.
Key is that I can not stop listening on IP 1 for site-to-site connections.
Thoughts?
Thank you!
On the SAA, you cannot use the additional IPS for VPN.
If tcp/443 is already used for an external server, then I would reconfigure the DNS entry for it to use the second IP address that must be sent to the internal server. You can then use the IP interface of the ASA for AnyConnect.
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Hello
I would like to configure the ASA for vpn only. By default, ASA allows traffic from the interface of high security to low security interface. I want to stop it. Is it possible to do without resorting to access lists.
Thank you
John
Define interfaces for the same level of security and make sure that you do not have same-security-traffic permits inter-interface enabled.
http://www.Cisco.com/en/us/products/ps6120/products_configuration_example09186a00807fc191.shtml
Hope that helps.
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Can the NAT of ASA configuration for vpn local pool
We have a group of tunnel remote ipsec, clients address pool use 172.18.33.0/24 which setup from command "ip local pool. The remote cliens must use full ipsec tunnel.
Because of IP overlap or route number, we would like to NAT this local basin of 172.18.33.0 to 192.168.3.0 subnet when vpn users access certain servers or subnet via external interface of the ASA. I have nat mapping address command from an interface to another interface of Armi. The pool local vpn is not behind any physical interface of the ASA. My question is can ASA policy NAT configuration for vpn local pool. If so, how to set up this NAT.
Thank you
Haiying
Elijah,
NAT_VPNClients ip 172.18.33.0 access list allow 255.255.255.0 10.1.1.0 255.255.255.0
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The above configuration will be NAT 172.18.33.0/24 to 192.168.33.0/24 when you go to 10.1.1.0/24 (assuming that 10.1.1.0/24 is your subnet of servers).
To allow the ASA to redirect rewritten traffic the same interface in which he receive, you must also order:
permit same-security-traffic intra-interface
Federico.
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Summary:
We strive to establish a two-way VPN L2L tunnel with a partner. VPN traffic is one-to-many towards our partner, and our partner they need of a many-to-one to us (they need to access a host on our network). In addition, our partner has many VPN, so they force us to use a separate NAT with two private hosts addresses, one for each direction of the tunnel.
My initial configuration of the tunnel on my grown up side of Phase 1, but not IPSec. Partner ran debug that revealed that my host did not address NAT'd in the NAT policy. We use an ASA5520, ver 7.0.
Here is the config:
# #List of OUR guests
the OURHosts object-group network
network-host 192.168.x.y object
# Hosts PARTNER #List
the PARTNERHosts object-group network
network-host 10.2.a.b object
###ACL for NAT
# Many - to - many outgoing
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# One - to - many incoming
VIH3 list extended access permit ip host 192.168.c.d PARTNERHosts object-group
# #NAT
NAT (INSIDE) 2-list of access NAT2
NAT (OUTSIDE) 2 172.20.n.0
NAT (INSIDE) 3 access-list VIH3
NAT (OUTSIDE) 3 172.20.n.1
# #ACL for VPN
access list permits extended VPN ip object-group objects PARTNERHosts OURHosts-group
access allowed extended VPN ip host 192.168.c.d PARTNERHosts object-group list
# #Tunnel
tunnel-group
type ipsec-l2l card
<#>crypto is the VPN address card crypto
<#>the value transform-set VPN #>card
<#>crypto defined peer #> #>I realize that the ACL for the VPN should read:
access allowed extended VPN ip host 172.20.n.0 PARTNERHosts object-group list
access allowed extended VPN ip host 172.20.n.1 PARTNERHosts object-group list
.. . If the NAT was working properly, but when this ACL is used, Phase 1 is not even negotiating, so I know the NAT is never translated.
What am I missing to NAT guests for 172.20 addresses host trying to access their internal addresses via the VPN?
Thanks in advance.
Patrick
Here is the order of operations for NAT on the firewall:
1 nat 0-list of access (free from nat)
2. match the existing xlates
3. match the static controls
a. static NAT with no access list
b. static PAT with no access list
4. match orders nat
a. nat [id] access-list (first match)
b. nat [id] [address] [mask] (best match)
i. If the ID is 0, create an xlate identity
II. use global pool for dynamic NAT
III. use global dynamic pool for PAT
If you can try
(1) a static NAT with an access list that will have priority on instruction of dynamic NAT
(2) as you can see on 4A it uses first match with NAT and access list so theoretically Exchange autour should do the trick.
I don't see any negative consequences? -Well Yes, you could lose all connectivity. I don't think that will happen, but I can't promise if you do absolutely not this after-hours.
Jon
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How to open the manual mini port for vpn connection in win7?
How to open the manual mini port for vpn connection in win7?
Hi Andrew,
Your question of Windows 7 is more complex than what is generally answered in the Microsoft Answers forums. It would be better suited to the TechNet community.
Please visit the link below to find a community that will provide the support you want.
http://social.technet.Microsoft.com/forums/en-us/w7itpronetworking/threads
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AAA for VPN - Kerberos, LDAP or an NT domain?
All,
After that a small return on what you think is the best method for AAA authentication for VPN clients when authenticating against a Windows domain for remote access?
I have always used "NT Domain" because it seems to correspond roughly to the NT Auth I used to use on the old hubs. However, I (finally) decided to take a look at the Kerberos and LDAP, since they must have been added for a reason...
Far as I can tell LDAP adds the ability to search a little more finely (basic DN) AD, but that's all. Am I missing something? Are there more reason to use LDAP or Kerberos domain auth?
What is more reliable? That you guys use?
See you soon!
Either it is reliable, you can map users in different group policies or apply different DAP political, based on their belonging to a group. If you are basic authentication, then your method is still the best way to go.
Thank you
Tarik Admani
* Please note the useful messages *. -
Traffic permitted only one-way for VPN-connected computers
Hello
I currently have an ASA 5505. I put up as a remote SSL VPN access. My computers can connect to the VPN very well. They just cannot access the internal network (192.168.250.0). They cannot ping the inside interface of the ASA, nor any of the machines. It seems that all traffic is blocked for them. The strange thing is that when someone is connected to the VPN, I can ping this ASA VPN connection machine and other machines inside the LAN. It seems that the traffic allows only one way. I messed up with ACL with nothing doesn't. Any suggestions please?
Pool DHCP-192.168.250.20 - 50--> for LAN
Pool VPN: 192.168.250.100 and 192.168.250.101
Outside interface to get the modem DHCP
The inside interface: 192.168.1.1
Courses Running Config:
: Saved
:
ASA Version 8.2 (5)
!
hostname HardmanASA
activate the password # encrypted
passwd # encrypted
names of
!
interface Ethernet0/0
switchport access vlan 20
!
interface Ethernet0/1
switchport access vlan 10
!
interface Ethernet0/2
switchport access vlan 10
!
interface Ethernet0/3
Shutdown
!
interface Ethernet0/4
Shutdown
!
interface Ethernet0/5
Shutdown
!
interface Ethernet0/6
Shutdown
!
interface Ethernet0/7
switchport access vlan 10
!
interface Vlan1
No nameif
no level of security
no ip address
!
interface Vlan10
nameif inside
security-level 100
IP 192.168.250.1 255.255.255.0
!
interface Vlan20
nameif outside
security-level 0
IP address dhcp setroute
!
passive FTP mode
DNS lookup field inside
DNS domain-lookup outside
pager lines 24
Within 1500 MTU
Outside 1500 MTU
mask 192.168.250.100 - 192.168.250.101 255.255.255.0 IP local pool VPN_Pool
ICMP unreachable rate-limit 1 burst-size 1
don't allow no asdm history
ARP timeout 14400
Global interface 10 (external)
NAT (inside) 10 192.168.250.0 255.255.255.0
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
timeout tcp-proxy-reassembly 0:01:00
Floating conn timeout 0:00:00
dynamic-access-policy-registration DfltAccessPolicy
the ssh LOCAL console AAA authentication
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http 192.168.250.0 255.255.255.0 inside
No snmp server location
No snmp Server contact
Server enable SNMP traps snmp authentication linkup, linkdown cold start
life crypto ipsec security association seconds 28800
Crypto ipsec kilobytes of life - safety 4608000 association
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SSH 192.168.250.0 255.255.255.0 inside
SSH timeout 5
SSH version 2
Console timeout 0
dhcpd dns 8.8.8.8
!
dhcpd address 192.168.250.20 - 192.168.250.50 inside
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!
a basic threat threat detection
Statistics-list of access threat detection
no statistical threat detection tcp-interception
WebVPN
allow outside
SVC disk0:/anyconnect-win-2.5.2014-k9.pkg 1 image
SVC disk0:/anyconnect-macosx-i386-2.5.2014-k9.pkg 2 image
Picture disk0:/anyconnect-linux-2.5.2014-k9.pkg 3 SVC
enable SVC
tunnel-group-list activate
attributes of Group Policy DfltGrpPolicy
value of server DNS 8.8.8.8
Protocol-tunnel-VPN IPSec l2tp ipsec svc webvpn
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tunnel-group AnyConnect General attributes
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tunnel-group AnyConnect webvpn-attributes
enable AnyConnect group-alias
!
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match default-inspection-traffic
!
!
type of policy-card inspect dns preset_dns_map
parameters
maximum message length automatic of customer
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
Review the ip options
inspect the netbios
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inspect esmtp
inspect sqlnet
inspect sunrpc
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!
global service-policy global_policy
context of prompt hostname
no remote anonymous reporting call
call-home
Profile of CiscoTAC-1
no active account
http https://tools.cisco.com/its/service/oddce/services/DDCEService destination address
email address of destination [email protected] / * /
destination-mode http transport
Subscribe to alert-group diagnosis
Subscribe to alert-group environment
Subscribe to alert-group monthly periodic inventory
monthly periodicals to subscribe to alert-group configuration
daily periodic subscribe to alert-group telemetry
Cryptochecksum:30fadff4b400e42e73e17167828e046f
: end
Hello
No worries
As we change the config I would do as well as possible.
First, it is strongly recommended to use a different range of IP addresses for VPN clients and the internal network
No VPN_Pool 192.168.250.100 - 192.168.250.101 255.255.255.0 ip local pool mask
mask 192.168.251.100 - 192.168.251.101 255.255.255.0 IP local pool VPN_Pool
NAT_0 ip 192.168.250.0 access list allow 255.255.255.0 192.168.251.0 255.255.255.0
NAT (inside) 0-list of access NAT_0
Then give it a try and it work note this post hehe
-
Hi guys,.
I use ASA Version 8.2 (1), I want to limit vpn users to use less bandwidth of my Interlink to access something on the inside of the network
example: source vpn pool
Destn: inside the network
Please let me know how to achieve this with QOS config.
Hello
Probably the best would be to match groups of tunnel.
class-map TG1-best-effort
match tunnel-group Tunnel-Group-1
match flow ip destination-address
Then this traffic in police policy-map and apply the service policy to the external interface (since you want to traffic police from your home). You can also use the pool for vpn access lists.
For more details, please see:
http://www.Cisco.com/en/us/docs/security/ASA/asa80/configuration/guide/QoS.html
-
Can I use a router 2911 like EasyVPN server for VPN phones or EasyVPN is only for the router-to-router VPN?
EasyVPN server can stop sessions IPSec client. I know not at all with native features of IPSec Cisco phones. There is version phone Cisco AnyConnect SSL VPN support including a 2911 can be dismissed to support.
Todd
-
What is the function of the IOS minimum set required for VPN site-to-site software?
Hi guys,.
I have a Cisco 1841 router to do a VPN site-to site. I would like to know what is the function of the IOS minimum set required for VPN site-to-site software?
Thanks in advance.
Hi Ja,
Advanced security or more should do it. The version of the IOS, you can try later 12.4 T which is c1841-advsecurityk9 - mz.124 - 24.T5.bin, in which case you don't want to go to 15.1 still.
I hope this helps.
Raga
-
Unique password on SAA for VPN access
Hello
It is posibble create a unique password on SAA for VPN access?
I googled a bit and found a few solutions with unique servers from other suppliers.
I wonder if this is possible without additional hardware/software.
Hello
you will need to integrate the VPN with the RSA. they will give you once the configuration of the password tokenized soft or hard token.
Outside of RSA, there is no other choice I guess.
I hope this helps.
Kind regards
Anisha.
P.S.: Please mark this message as answered if you feel that your query is resolved. Note the useful messages.
-
Dynamic routing for VPN Failover L2L
Hello
Can someone offer me some advice on this please?
I have attached a simple diagram of our EXTENSIVE referral network.
Overview
- The firewall is ASA 5510 running 8.4 (9)
- Basic to the Headquarters network uses OSPF
- On ASA static routes are redistributed into OSPF
- On ASA for VPN static routes are redistributed into OSPF with 130 metric so redistributed BGP routes are preferred
- Basic network has a static route to 10.0.0.0/8 to Corporate WAN, which is redistributed into OSPF
- Branch Office WAN uses BGP - routes are redistributed into OSPF
- The branch routers using VRRP for redundancy of the IP for the default gateway of local customers.
- Branch router main past off VRRP IP to router backup when the WAN interface is down
- BO backup router (. 253) contains only a default route to the internet
- In normal operation, the traffic to and from BO uses Local Branch Office WAN
- If local BO WAN link fails, traffic to and from the BO uses IPSec VPN via public Internet
I try to configure dynamic routing on our network for when a branch switches to the IPsec VPN. What I want to happen (not sure if it is possible) is for the ASA announce the subnet to the remote end of the VPN in OSPF to Headquarters.
I managed to get this working using IPP, but for some reason any VPN stay up all the time when we are not in a failover scenario. This causes the ASA added the table as a static route is the remote subnet in it and do not use the announced route of OSPF from the core network. This prevents the BO customers access to the Internet. If I remove the IPP on the VPN setting, ASA learns the route to the subnet via the WAN BO - resumes normal operation.
I have configured the metric of the static routes that get redistributed into OSPF by ASA superior to 110. This is so that the routes redistributed by the WAN BO OSPF BGP, are preferred. The idea being that when the WAN link is again available, the routing changes automatically and the site fails to WAN BO.
I guess what I need to know is; This design is feasible, and if so where I'm going wrong?
Thank you
Paul
Hi Paul,.
your ASA maintains the tunnel alive only because this path exists on ASA. This is why you must use IP - SLA on ASA to push network taffic "10.10.10.0/24" based on the echo response, using the ALS-intellectual property
Please look at the example below, in the example below shows that the traffic flows through the tunnel, only if the ASA cannot reach the 10.10.10.0/24 network via the internal network of HQ.
This configuration illuminate ASA.
Route inside 10.10.10.0 255.255.2550 10.0.0.2 track 10
(assuming 10.0.0.2 ip peering from inside the ip address of the router to HO)
Route outside 10.10.10.0 255.255.255.0 xxx.xxx.xxx.xxx 254
(value of 254 is a more expensive route to go via IPSec tunnel and x = the bridge by default-ISP)
ALS 99 monitor
type echo protocol ipIcmpEcho 10.10.10.254 inside interface
NUM-package of 3
frequency 10
Annex monitor SLA 99 life never start-time now
track 10 rtr 99 accessibility
Let me know, if this can help.
Thank you
Rizwan James
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