IPSec VPN with private WAN address... Help!

I am trying to establish an IPSec Site to Site VPN to my company network. I use a Cisco 2811. If I plug a Public IP WAN connection my tunnel past traffic without problem, but if I tell a router in the middle where the 2811 pulls a private IP address of the home router I no longer get a tunnel a success. Any suggestion?

I have the following instructions.

FA 0/0
DHCP IP ADDRESS
CRYPTO MAP AESMAP

VLAN 1
IP ADDRESS XX. XX. XX. XX 255.255.255.240 (public IP)

IP ROUTE 0.0.0.0 0.0.0.0 FA 0/0

If this can help clerify the "router" is a CradlePoint (CRT500) that takes the Mobile 3 G and send it to an ethernet port on the WAN port on my router. The installation remains mobile and I rarely get the chance to have a public IP address for my WAN. Currently I use a SonicWall TX 100 router that allows me to VPN to my network of companies. We hope to move all of our mobile kits to the cisco product, but need to find a solution before change can occur.

If I do 'Show IP Crypto ISAKMP SA' it shows: XX. XX. XX. XX (PUBLIC) <> Active 192.168.0.1.

My thoughts are that my TCP 500 traffic to the VPN router and when the VPN router sends traffic to the address there SA with it's no the case because it is an ip address private. Limited my knowledge of the works of the VPN, I think only in Phase 1, two addresses must "bind" and NAT cannot be used with VPN? But I keep out hope that this might be a somewhat common question and there is a procedure in place to get around, or maybe I'm just a bad configuration or IP road...

When I disable card crypto on the FA 0/0 and add NAT to the FA 0/0 and 1 VLAN more change my IP Route to "0.0.0.0 0.0.0.0 192.168.0.1" I get non - vpn connectivity.  Also, I put the address that gets my FA 0/0 in the DMZ of the Cradlepoint.

Thanks for any help anyone can provide!

Brandon,

NAT - T is designed to overcome the problems of NAT/PAT, known in the world of IPv4.

The big problem is that if you have a public IPv4 address, you will need to run PAT. Packages ESP / AH do not have a port number so that they cannot be PATed. To do this, we enacapsulate IPsec payload inside udp/4500 packages.

That being said, some providers overcome this problem differently, but it's not THE standard way.

Your head should see you as PublicIP facig of internet device.

I agree, that both sonicwall and IOS should work with other IOS. At the same time, it is difficult to say what is happening in the middle.

I would say that if possible, connect you to a case of TAC, the guys will be able to view your configs and able to solve the problem when it's there. These types of discussions on the forums can go for very long ;-)

Marcin

Tags: Cisco Security

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    Hello guys,.

    I have Cisco ASA5520 facing the ISP with private IP address. We don't have a router and how to get the IPSec VPN through the internet?

    The question statement not the interface pointing to ISP isn't IP address private and inside as well.

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    I have public IP block 199.9.9.1/28

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    can I assign a public IP address on the Gig1 inside the interface with the security level of 100 and how to apply inside to carry on this interface?

    If I configure > firewall inside of the item in gi1 interface ip address 199.9.9.1/28 with security-level 100. How to make a safe lane VPN through this interface on the internet?

    I'm used to the public IP address allocation to the interface outside of the firewall and private inside the interface IP address.

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    Thomas McLeod

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    http://www.Cisco.com/en/us/docs/security/vpn_modules/6342/configuration/guide/6342vpn4.html#wp1036111

    I've not personally configured L2TP/IPSec on IOS, only on ASA, so cannot be 100% sure that the config in the link works, but the general idea should be ok.

  • LAN-to-LAN IPsec VPN with overlapping networks problem

    I am trying to connect to two networks operlapping via IPsec. I already have google and read

    http://www.Cisco.com/en/us/products/ps6120/products_configuration_example09186a0080b37d0b.shtml

    Details:

    Site_A use ASA 5510 with software version 8.0 (4) 32. Site_A use 10.100.0.0/24, 10.100.1.0/24 and 10.100.2.0/24 inside networks. 10.100.0.0/24 is directly connected to ASA (like vlan10), 10.100.1.0/24 and 10.100.2.0/24 are routed.

    Site_B use Linux box and networks 10.100.1.0/24, 10.100.2.0/24, 10.100.3.0/24 and so on (mainly 10.100.x.0/24). I have not implemented this ASA, we took over this infrastructure without other documentation whatsoever.

    According to the above link I should use double NAT. Site_B will see the Site_A as 10.26.0.0/22 networks, and Site_A see networks in Site_B as 10.25.0.0/24. Site_A is allowed access only 10.100.1.0/24 in the Site_B, and Site_B is allowed access to all the networks of the Site_A 10.100.x.0/24 - so / 22 10.26.0.0/22 mask. I would like, for example, ssh to host in the Site_B to host the Site_A using 10.26.1.222 as the destination ip address (and it should be translated in 10.100.1.222 on the side Site_A). I'm looking for something like ip nat type match-host in Cisco routers - I want to translate only a part of the network address leave the intact host Party. Anyway, following the steps from the link displayed above everything is ok until the command:

    static (companyname, outside) 10.26.0.0 access list fake_nat_outbound

    which translates into:

    WARNING: address real conflict with existing static

    TCP companyname:10.100.0.6/443 to outside:x.x.x.178/443 netmask 255.255.255.255

    WARNING: address real conflict with existing static

    TCP companyname:10.100.0.20/25 to outside:x.x.x.178/25 netmask 255.255.255.255

    WARNING: address real conflict with existing static

    TCP companyname:10.100.0.128/3389 to outside:x.x.x.178/50000 netmask 255.255.255.255

    WARNING: address real conflict with existing static

    TCP companyname:10.100.0.26/3389 to outside:x.x.x.181/2001 netmask 255.255.255.255

    WARNING: address real conflict with existing static

    TCP companyname:10.100.0.27/3389 to outside:x.x.x.181/2002 netmask 255.255.255.255

    WARNING: address real conflict with existing static

    TCP companyname:10.100.0.28/3389 to outside:x.x.x.178/2003 netmask 255.255.255.255

    Those are redirects to port on Site_A used for mail, webmail, etc. What should I do to keep the redirects from the Internet to companyname vlan and at the same time to have work l2l ipsec tunnel linking networks that overlap?

    Thank you in advance for any help or advice.

    The ASA config snippet below:

    !

    ASA 4,0000 Version 32

    !

    no names

    name 10.25.0.0 siteB-fake-network description fake NAT network to avoid an overlap of intellectual property

    name 10.26.0.0 description of siteA-fake-network NAT fake network to avoid an overlap of intellectual property

    !

    interface Ethernet0/0

    Shutdown

    nameif inside

    security-level 100

    IP 10.200.32.254 255.255.255.0

    !

    interface Ethernet0/1

    nameif outside

    security-level 0

    IP address x.x.x.178 255.255.255.248

    !

    interface Ethernet0/2

    No nameif

    no level of security

    no ip address

    !

    interface Ethernet0/2.10

    VLAN 10

    nameif companyname

    security-level 100

    IP 10.100.0.254 255.255.255.0

    !

    interface Ethernet0/2.20

    VLAN 20

    nameif wifi

    security-level 100

    the IP 10.0.0.1 255.255.255.240

    !

    interface Ethernet0/2.30

    VLAN 30

    nameif dmz

    security-level 50

    IP 10.0.30.1 255.255.255.248

    !

    interface Ethernet0/3

    Shutdown

    No nameif

    no level of security

    no ip address

    !

    interface Management0/0

    nameif management

    security-level 100

    IP 10.100.100.1 255.255.255.0

    management only

    !

    permit same-security-traffic inter-interface

    permit same-security-traffic intra-interface

    object-group Protocol TCPUDP

    object-protocol udp

    object-tcp protocol

    Group of objects in the inside network

    object-network 10.100.0.0 255.255.255.0

    object-network 10.100.1.0 255.255.255.0

    object-network 10.100.2.0 255.255.255.0

    DM_INLINE_TCP_1 tcp service object-group

    port-object eq 2221

    port-object eq 2222

    port-object eq 2223

    port-object eq 2224

    port-object eq 2846

    DM_INLINE_TCP_5 tcp service object-group

    port-object eq ftp

    port-object eq ftp - data

    port-object eq www

    EQ object of the https port

    object-group service DM_INLINE_SERVICE_1

    the eq field tcp service object

    the eq field udp service object

    DM_INLINE_TCP_6 tcp service object-group

    port-object eq 2221

    port-object eq 2222

    port-object eq 2223

    port-object eq 2224

    port-object eq 2846

    the DM_INLINE_NETWORK_1 object-group network

    object-network 10.100.0.0 255.255.255.0

    object-network 10.100.2.0 255.255.255.0

    standard access list securevpn_splitTunnelAcl allow 10.100.0.0 255.255.255.0

    outside_access_in list extended access permit tcp any host x.x.x.178 eq 50000

    outside_access_in list extended access permit tcp any host x.x.x.178 eq smtp

    outside_access_in list extended access permit tcp any host x.x.x.178 eq https

    outside_access_in list extended access permit tcp any host x.x.x.179 DM_INLINE_TCP_1 object-group

    outside_access_in list extended access permit tcp any host x.x.x.181 eq ftp

    outside_access_in list extended access permit tcp any host x.x.x.181 eq ftp - data

    outside_access_in list extended access permit tcp host 205.158.110.63 eq x.x.x.180 idle ssh

    access extensive list ip 10.100.0.0 inside_access_in allow 255.255.255.0 10.100.1.0 255.255.255.0

    inside_access_in list extended access allowed ip-group of objects to the inside network 10.100.99.0 255.255.255.0

    inside_access_in list extended access allowed ip-group of objects to the inside network 10.0.30.0 255.255.255.248

    inside_access_in list extended access permit tcp host 10.100.0.6 any eq smtp

    inside_access_in list extended access permitted tcp object-group network inside any eq www

    inside_access_in list extended access permitted tcp object-group network inside any https eq

    inside_access_in list extended access permitted tcp-group of objects to the inside-network WG 1023 any eq ftp - data

    inside_access_in list extended access permitted tcp-group of objects to the inside-network WG 1023 any ftp eq

    inside_access_in list extended access allowed object-group objects TCPUDP-group to the network inside any eq 9999

    inside_access_in list extended access allowed object-group objects TCPUDP-group to the network inside any eq 3389

    inside_access_in list extended access allowed object-group network inside udp any eq field

    companyname_access_in list extended access allowed ip-group of objects to the inside network 10.100.1.0 255.255.255.0

    companyname_access_in list extended access allowed ip-group of objects to the inside network 10.100.99.0 255.255.255.0

    companyname_access_in list extended access allowed ip-group of objects to the inside network 10.0.30.0 255.255.255.248

    companyname_access_in list extended access permit tcp host 10.100.0.6 any eq smtp

    companyname_access_in list extended access permitted tcp object-group network inside any eq www

    companyname_access_in list extended access permitted tcp object-group network inside any https eq

    companyname_access_in list extended access permitted tcp-group of objects to the inside-network WG 1023 any eq ftp - data

    companyname_access_in list extended access permitted tcp-group of objects to the inside-network WG 1023 any ftp eq

    companyname_access_in list extended access allowed object-group objects TCPUDP-group to the network inside any eq 9999

    companyname_access_in list extended access allowed object-group objects TCPUDP-group to the network inside any eq 3389

    companyname_access_in list extended access allowed object-group network inside udp any eq field

    wifi_access_in list extended access permitted tcp 10.0.0.0 255.255.255.240 host 10.100.0.40 eq 2001

    access extensive list ip 10.100.0.0 companyname_nat0_outbound allow 255.255.255.0 10.100.99.0 255.255.255.0

    access extensive list ip 10.100.0.0 companyname_nat0_outbound allow 255.255.255.0 10.0.0.0 255.255.255.240

    access extensive list ip 10.100.0.0 companyname_nat0_outbound allow 255.255.255.0 10.0.30.0 255.255.255.248

    access extensive list ip 10.100.0.0 companyname_nat0_outbound allow 255.255.255.0 10.100.2.0 255.255.255.0

    access extensive list ip 10.100.2.0 companyname_nat0_outbound allow 255.255.255.0 10.0.30.0 255.255.255.248

    access extensive list ip 10.100.1.0 companyname_nat0_outbound allow 255.255.255.0 10.100.99.0 255.255.255.0

    access extensive list ip 10.100.2.0 companyname_nat0_outbound allow 255.255.255.0 10.100.99.0 255.255.255.0

    wifi_nat0_outbound to access ip 10.0.0.0 scope list allow 255.255.255.240 10.100.0.0 255.255.255.0

    dmz_access_in list extended access permitted tcp 10.0.30.0 255.255.255.248 any DM_INLINE_TCP_5 object-group

    dmz_access_in list extended access permitted tcp 10.0.30.0 255.255.255.248 host 10.100.0.2 object-group DM_INLINE_TCP_6

    dmz_access_in list extended access allowed object-group DM_INLINE_SERVICE_1 10.0.30.0 255.255.255.248 object-group DM_INLINE_NETWORK_1

    dmz_access_in list extended access deny ip 10.0.30.0 255.255.255.248 all

    access extensive list ip 10.0.30.0 dmz_nat0_outbound allow 255.255.255.248 10.100.0.0 255.255.255.0

    access extensive list ip 10.0.30.0 dmz_nat0_outbound allow 255.255.255.248 10.100.99.0 255.255.255.0

    access extensive list ip 10.0.30.0 dmz_nat0_outbound allow 255.255.255.248 10.100.2.0 255.255.255.0

    outside_1_cryptomap to access extended list ip 10.26.0.0 allow 255.255.252.0 10.25.0.0 255.255.255.0

    access extensive list ip 10.100.0.0 fake_nat_outbound allow 255.255.252.0 10.25.0.0 255.255.255.0

    IP local pool clientVPNpool 10.100.99.101 - 10.100.99.199 mask 255.255.255.0

    IP verify reverse path inside interface

    IP verify reverse path to the outside interface

    IP audit name IPS attack action alarm down reset

    IP audit name IPS - inf info action alarm

    interface verification IP outside of the IPS - inf

    verification of IP outside the SPI interface

    NAT-control

    Global (inside) 91 10.100.0.2

    Global (inside) 92 10.100.0.4

    Global (inside) 90 10.100.0.3 netmask 255.255.255.0

    Global interface 10 (external)

    Global x.x.x.179 91 (outside)

    Global x.x.x.181 92 (outside)

    Global (outside) 90 x.x.x.180 netmask 255.0.0.0

    interface of global (companyname) 10

    Global interface (dmz) 20

    NAT (outside) 10 10.100.99.0 255.255.255.0

    NAT (companyname) 0-list of access companyname_nat0_outbound

    NAT (companyname) 10 10.100.0.0 255.255.255.0

    NAT (companyname) 10 10.100.1.0 255.255.255.0

    NAT (companyname) 10 10.100.2.0 255.255.255.0

    wifi_nat0_outbound (wifi) NAT 0 access list

    NAT (dmz) 0-list of access dmz_nat0_outbound

    NAT (dmz) 10 10.0.30.0 255.255.255.248

    static (companyname, outside) tcp https 10.100.0.6 https interface subnet 255.255.255.255 mask

    static (companyname, outside) tcp interface smtp 10.100.0.20 smtp netmask 255.255.255.255

    static (companyname, outside) interface 50000 10.100.0.128 TCP 3389 netmask 255.255.255.255

    static (companyname, external) x.x.x.181 2001 10.100.0.26 TCP 3389 netmask 255.255.255.255

    static (companyname, external) x.x.x.181 2002 10.100.0.27 TCP 3389 netmask 255.255.255.255

    static (companyname, outside) interface 2003 10.100.0.28 TCP 3389 netmask 255.255.255.255

    static (dmz, outside) tcp x.x.x.181 ftp 10.0.30.2 ftp netmask 255.255.255.255

    static (companyname, companyname) 10.100.1.0 10.100.1.0 netmask 255.255.255.0

    static (companyname, companyname) 10.100.2.0 10.100.2.0 netmask 255.255.255.0

    inside_access_in access to the interface inside group

    Access-group outside_access_in in interface outside

    Access-group companyname_access_in in interface companyname

    Access-group wifi_access_in in wifi interface

    Access-group dmz_access_in in dmz interface

    Route outside 0.0.0.0 0.0.0.0 x.x.x.177 1

    Companyname route 10.0.1.0 255.255.255.0 10.100.0.1 1

    Companyname route 10.100.1.0 255.255.255.0 10.100.0.1 1

    Companyname route 10.100.2.0 255.255.255.0 10.100.0.1 1

    dynamic-access-policy-registration DfltAccessPolicy

    !

    Crypto-map dynamic outside_dyn_map 20 set pfs

    Crypto-map dynamic outside_dyn_map 20 the transform-set ESP - 3DES - SHA TRANS_ESP_3DES_MD5 value

    life together - the association of security crypto dynamic-map outside_dyn_map 20 28800 seconds

    Crypto-map dynamic outside_dyn_map 20 kilobytes of life together - the association of safety 4608000

    PFS set 40 crypto dynamic-map outside_dyn_map

    Crypto-map dynamic outside_dyn_map 40 value transform-set ESP-3DES-SHA

    life together - the association of security crypto dynamic-map outside_dyn_map 40 28800 seconds

    Crypto-map dynamic outside_dyn_map 40 kilobytes of life together - the association of safety 4608000

    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_map 1 match address outside_1_cryptomap

    card crypto outside_map 1 set pfs Group1

    outside_map 1 counterpart set a.b.c.1 crypto card

    card crypto outside_map 1 set of transformation-ESP-3DES-SHA

    map outside_map 20-isakmp ipsec crypto dynamic outside_dyn_map

    outside_map interface card crypto outside

    !

    internal DefaultRAGroup group strategy

    attributes of Group Policy DefaultRAGroup

    value of server WINS 10.100.0.3

    value of server DNS 10.100.0.3

    nom_societe.com value by default-field

    internal DefaultRAGroup_1 group strategy

    attributes of Group Policy DefaultRAGroup_1

    value of server DNS 10.100.0.3

    Protocol-tunnel-VPN l2tp ipsec

    internal group securevpn strategy

    securevpn group policy attributes

    value of server WINS 10.100.0.3 10.100.0.2

    value of 10.100.0.3 DNS server 10.100.0.2

    VPN-idle-timeout 30

    Protocol-tunnel-VPN IPSec

    nom_societe.com value by default-field

    attributes global-tunnel-group DefaultRAGroup

    address clientVPNpool pool

    authentication-server-group COMPANYNAME_AD

    Group Policy - by default-DefaultRAGroup_1

    IPSec-attributes tunnel-group DefaultRAGroup

    pre-shared-key *.

    tunnel-group securevpn type remote access

    tunnel-group securevpn General attributes

    address clientVPNpool pool

    authentication-server-group COMPANYNAME_AD

    Group Policy - by default-securevpn

    tunnel-group securevpn ipsec-attributes

    pre-shared-key *.

    tunnel-group securevpn ppp-attributes

    ms-chap-v2 authentication

    tunnel-group a.b.c.1 type ipsec-l2l

    a.b.c.1 group tunnel ipsec-attributes

    pre-shared-key *.

    Are you sure that static-config does not make to the running configuration?

    By applying this 'static big' you're essentially trying to redirect the ports, which have already been transmitted by the rules in your existing configuration. This explains the caveat: what you are trying to do has some overlap with existing static.

    (Sorry for the use of the transmission of the word, but this behavior makes more sense if you look at it like this; although "port forwarding" is not Cisco-terminology.)

    But... whenever I stumbled upon this question, the warning was exactly that: a WARNING, not an ERROR. And everything works as I want it to work: the specific static in my current config simply have priority over static grand.

    If you would like to try to do the other opposite you would get an error (first static major, then try to apply more specific) and the config is not applied.

    So could you tell me the config is really not accepted?

  • IPsec VPN with Cisco AnyConnect and 1921 ISR G2 router

    Hello

    Is it possible to establish a remote access VPN IPSec using Cisco Anyconnect client with router Cisco ISR G2 1921.

    If someone does share it please the sample configuration. as I've been on this topic since last week a.

    My Cisco rep recommended I have not try AnyConnect a router ISR or ASR.  So I used an Open Source client.  Don't say that AnyConnect won't work, just the route I took on my project.  I work good known configuration for a 1921 with strongSwan as a Client.  It is with IPSEC and IKEV2 using certificates for authentication.

  • IPsec VPN with 2 ISP on a single backup endpoint router

    I have the following configuration setup:

    Cisco 1811 (router Client)

    FA0 - network internal 192.168.0.0/24

    SA1 - connection of ISPS, we'll call it 1.1.1.1

    FA2 - Vlan 800

    VLAN 800 - secondary ISP connection, we'll call it 2.2.2.2

    ASA 5580 running 8.2

    Outside of the interface we will call 3.3.3.3

    crypto map set 5 peer 1.1.1.1 2.2.2.2

    crypto 5 game card address test_network

    I have a tunnel-group defined for 1.1.1.1 and 2.2.2.2

    Now for the question. I have the setup of 1811 with SLA monitoring. I use a default road map to ensure that the ICMP out Fa1 continuously and I have followed the default route with this. I have a route weighted 250 floating default pointing to the ISP of backup.

    While the two networks are available, I can create the tunnel using the ISP to 3.3.3.3 (of 1.1.1.1). I can ping through the tunnel without end. I can then simulate a failure of the ISP and will give the blow the way secondary. I ping through the tunnel again, and on the ASA, I see that a new ISAKMP connection has been set up. Looking on the 1811, I see isakmp QM_IDLE connections (2).

    While the main link does not work, I can still ping through the tunnel without end. The primary session isakmp on the 1811 falls never turned off, but on the ASA, in fact get deleted. The ASA has only a connection made to 2.2.2.2. Once the primary link retrieves and the default route is back to the first ISP connection, the tunnel never recovers. The ASA appears to think that the secondary ISP is still the active connection and routing does not work in the tunnel as the 1811 tries to send data to the ISP.

    Is there a way to do the following:

    -When the ISP main breaks down on the 1811, the established tunnel is cancelled

    -When the main ISPS back upward on the 1811, the SAA can re-establish the connection by using the primary link (or the backup on the 1811 tunnel is disconnected)?

    Is it still possible to do on a single router (2 links ISP) or it can be done using 2 routers?

    I would like to know if I need to explain a little better or if the configuration details are needed.

    Thank you!

    Jeff

    Jeffrey,

    In having followed IP SLA on the 1811, as soon as the track is down, the second tunnel should be established. (this also means that, by enabling KeepAlive on both ends, they should note that the main tunnel is not active and bring both ends).

    The KeepAlive will constantly monitor the health of the other peer, so this should help you to these two questions.

    Federico.

  • PIX IPSec VPN with Cisco 877W

    Hi all

    I am trying to create a VPN between a PIX and a Cisco 877W tunnel but can't seem to get the tunnel. When I do a 'sho crypto session"on the Cisco 877, I get, he said session state is declining, then changed to NEGOTIATE DOWN, but it is now down again... Please find attached the configs for both ends... Are there commands to confirm that the tunnel is up other than to try to ping the remote end? I would greatly appreciate any help lift this tunnel.

    Kind regards

    REDA

    Hello

    Based on the configurations of joined, to do some changes. For example:

    1. the isakmp policies do not match on the router and the pix. Make sure the hash group Diffie-Hellman and life correspond on the 877 and pix.

    2. the access list for the ipsec traffic must be images of mirror of the other.

    3. make sure life of ipsec on the two peers.

    I hope it helps.

    Kind regards

    Arul

    Rate if this can help.

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