IPSEC VPN tunnel (LAN to LAN) not passing the traffic

[mbstrauss]

I have got a temporary scenario where I need to establish a IPSEC VPN between branch ( cisco router) and HQ ( VPN concentrator).

The tunnel is established fine but traffic stops passing after some 5 to 10 mins. I have to manually clear the crypto session and then the connectivity is fine. For testing the above I am sending ICMP packets from branch towards HQ. I can see 'cryto isakmp sa' and 'crytpo ipsec sa' both active and fine.

Please guys share your thoughts on this !!!

[Parminder Sian · Accepted solution]

Hi,

Make sure that lifetime matches on Router and Concentrator.

Here's a doc for troubleshooting on IPSEC:-

http://www.cisco.com/en/US/customer/products/ps6120/products_tech_note09186a00807e0aca.shtml

Parminder Sian

[mbstrauss]

Hi Parminder,

It works...thanks for your reply.