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New Member

PIX to Router VPN


I have configured a PIX to Router VPN but have an issue.

If you ping from a client on the router inside LAN to a device on the PIX inside LAN there is no reply.

If you do an extended ping from the router, using the inside interface source address (same network as previous client) - this works.

When you ping from the client - I can see the tunnel created and occasionally a single reply is seen - usually the first after tunnel setup.

Clients can ping the internet, both ends have their correct gateways.

Any help welcome


New Member

Re: PIX to Router VPN

Can you post any of the config from the PIX and router. Is there any NAT involved.

The fact that you say the first packet works tells me that process switched packets are getting encrypted correctly, but fast switched packets do not get processed correctly. You can test this by disabling fast switching. Another possible solution would be to use CEF.

Do a show ip int brief to determine your switching method.