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Cisco ASA L2L VPNs down after ISP Change

Posted on 2011-03-06
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Last Modified: 2012-05-11
Hello
We just changed ISPs and thus have new IPS.  We have a new WAN IP and then a block of IPS (CIDR).   After this change our two site to site VPN tunnels stopped working.  We changed the IP of the remote site to the new WAN interface IP (on the two remote routers) but the connections still won't work.  All of the devices are Cisco ASA apliances.  Are we missing something in regards to ACL or routing ?    Usually changing the remote site VPN on the remote routers brings things right back up.

Thanks for your help.

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Question by:corpdsinc
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8 Comments
 
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lrmoore earned 250 total points
ID: 35049913
Do you have any route statements left over pointing to the old ISP gateway?
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by:corpdsinc
ID: 35049972
Nope, all of the static routes point to the new WAN IP.... now that I think about it...the WAN INT Ip is a /28 ..  Do you think that fact that the 0.0.0.0 0.0.0.0 static route is set to the WAN INT IP instead of the WAN INT gateway could be the problem?
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by:predragpetrovic
predragpetrovic earned 250 total points
ID: 35050812
Hi,

can you send debug outputs... i think that the remote ends did not update the peer IP addresses.
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by:lrmoore
ID: 35051194
>Do you think that fact that the 0.0.0.0 0.0.0.0 static route is set to the WAN INT IP instead of the WAN INT gateway could be the problem?
Absolutely! It must point to the next hop, never to your own interface ip!
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Author Comment

by:corpdsinc
ID: 35051292
Ok..my bad.  I forgot that i did change the default routes  for the WAN INT default gateway yesterday..I was excited about that being the fix...but no luck.  Any other ideas?  

Pedraq:  I have verified that that peer IPs are correct.  In fact, I recreated the VPN on one of the remote sites via the wizzard creating new tunnel group and Peer IP etc.  

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Expert Comment

by:predragpetrovic
ID: 35051837
ok,

could you do the following on your ASA device:

debug crypto ipsec
debug crypto isakmp
terminal monitor

and try to send traffic from one site to another (traffic which matches the crypto maps), send the debugs.
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Author Comment

by:corpdsinc
ID: 35058185
I was unable to do th debug.  But using ASDM monitoring I see that the lan2lan tunnel is established.  At the remote side it is passing two way traffic.  HOWEVER, at the main site (where the public IP was changed) it is receiving data but not transmitting (0 TX bytes 970 RX bytes)
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by:corpdsinc
ID: 35061687
I now have both VPN connected now...but still not passing traffic.  I have included a JPG of the ASDM monitor showing one way traffic. ASDM
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