ASA Site to not tunnel no transmission of traffic for some subnets after awhile

Hello

We have a question really strange tunnel from site to site on several ASAs.

We organize VPN tunnels between a small site and three largest.

The den has an ASA 5505, the other three principles are ASA 5510.

One of the tunnels working for months without problems.

Each tunnel has several class C network.

example Site:

-192.168.50.0/24 (named A1)

-192.168.51.0/24 (called A2)

Site b:

-192.168.60.0/24 (named B1)

-192.168.61.0/24 (called B2)

On two faulty tunnels, all is well at the beginning. After a few days (1-14) some networks to cease to work. So I can ping both A1 and A2 B1 network networks, but only from A2 B2 network. Pings from A1 to B2 doesn't expire. The ASA site showed tx = 0 traffic for <=>A1, B2, but progressive count rx traffic. ASA b it shows rx = 0 to B2<=>A1 and tx counties upward.

This happens unexpected after different periods. Sometimes he hits ASA on site B, where tx = 0, it is sometimes ASA on A site.

I tried to fix it as a result of orders:

ISAKMP crypto claire his
clear crypto ipsec his
clear xlate

but nothing has worked. The only solution for now is to restart the ASA where tx County indicates 0. After restarting, everything goes well for a while.

On one of the affected sites, we have a failover configuration - ASA. A failover of the active device also solves the problem. But if you change your prior back restart the old principal question will return immediately.

I think that there is no configuration because:

-All tunnels are configured in the same way, and one of them is running for moths without any problem

-Tunnels work for all combinations of subnet after a reboot

-The problem occurs after different and long periods of time. So I think that the period between failures is long to be caused by tunnel a.s.o. timeouts.

All ASA are running 9.1. (5) 21.

I updated the firmware of several releases these past few months and had the same problem with any version I tested.

So I hope that someone else has also had this problem and found a solution.

Christian Hey!

Hopefully, solve or find the root cause?

Thank you

Tags: Cisco Security

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