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Cisco PIX to Cisco 1841 IPSEC VPN issues

Last Modified: 2012-06-27
Dear Experts

My setup is as follows:

Cisco PIX 515

Branch office:
Cisco 1841 router with Advanced Security feature set

My HQ also has other branch offices connected via MPLS.

I have onfigured IPSEC VPN connectivity between the PIX and the 1841 router.

Initially, I configured the PIX and 1841 to only route the connected subnets ( & across the runnel and everything was working fine.

Second step, I added to also be available across the VPN from my branch office. Everything was still working fine.

Next step, I also added to be available from the branch office. That's when my problems started.
Immediately, the VPN tunnel became very unstable. Frequently, the tunnel would go down and no traffic would be routed across.
As soon as I removed from the tunnel, it stabilized again.

Are there any limitations in how much traffic the 1841 router can handle, or am I missing something on the configuration?

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