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using vpn client behind a firewall

Hi all.

I want to use the vpn client behind a firewall. We have a pix between our internet connection and the inside. I want to be able to vpn to customer networks from our internal network rather than dialing up to the internet all the time. Anyone know what i have to permit on the pix for this to happen?

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Cisco Employee

Re: using vpn client behind a firewall

Whether doing IPSec or PPTP (you don't specify), the problem is that you're probably doing PAT on the PIX. PAT and IPSec/PPTP don't work well together, particularly through a PIX (in fact, 6.3 code due out next year will have support for one IPSec and one PPTP tunnel going through a PIX with PAT, but that doesn't help you much now).

The only way around this at the moment is to create a static one-to-one translation for your inside PC on the PIX, but of course that means you need a second global IP address. If you're coming from the inside, you'll also need to create conduits/ACL's to allow IP protocol 50 (IPsec, actually ESP) or IP protocl 47 (PPTP, actually GRE) to come back in, cause the PIX won't open a hole for these automatically cause they're not TCP/UDP protocols.

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