10-20-2008 09:06 AM - edited 03-12-2019 05:58 PM
Hi, I am debugging intermittent hairpin VPN traffic between EZVPN clients, ASA 5520 is ezvpn server. I am trying to determine where the packet is dropped.
From one client continuous ping to the other client is issued, the ping packets should go to ASA's outside interface, decrypted and encrypted and again be sent out the same outside interface. When I do capture for the ping packets on ASA's outside interface, nothing is captured even when ping is successful.
ping capture from ezvpn client to ASA inside network is fine.
How should I do packet capture in this VPN hairpin scenario? Thanks a lot for your help.
10-20-2008 09:50 PM
What is the access-list you are using to capture on the outside interface?
Regards
Farrukh
10-20-2008 10:31 PM
EZVPN client is running at network extension mode, each user is using 172.16.0.0/28 address space, so the ACL I am using is something like this: access-list ping_acl extended permit icmp host 172.16.0.1 host 172.16.0.17
10-20-2008 10:56 PM
Try the following:
access-list ping_acl extended permit icmp host 172.16.0.1 host 172.16.0.17 log
access-list ping_acl extended permit icmp host 172.16.0.17 host 172.16.0.1 log
See if you get hits in the log (besides the capture).
Also make sure you clear the VPN sessions/connections before testing, an easy way would be
clear local-host all
clear crypto isakmp sa
clear crypto ipsec sa
Regards
Farrukh
10-20-2008 11:31 PM
Thank you for your help, unfortunately this is not a lab environment, I can not do any of those clear commands unless a maintenance window is scheduled.
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