VPN through NAT?

[Jeff at NorrisTechs]

more.

Also with a netgear router that have whats called VPN pass through,  
they see VPN traffic and pass it though to the host.  Where as cisco or 
other high-end routers and FreeBSD based routers, you get to deal with 
port translation so you have to create the rule to pass TCP port 1723, 
and if GRE is needed its protocol 47.

Cheers

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*/Jeff Norris/*
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Troy Settle wrote:
> Probably not the best list to ask this on, but it's the closest that 
> I'm subscribed to...
>
> I have several customers who use VPN (Windows PPTP) to connect to 
> their Corporate networks.  The first was sitting behind NAT on a 
> FreeBSD router.  The PPTP did not work.  I moved them out of NAT and 
> onto a regular IP, and it worked fine.  I then swapped out the FreeBSD 
> box with a Cisco 2620 and again tried the PPTP via NAT, but still it 
> wouldn't work.
>
> Another customer is behind a Cisco 804 and his PPTP also did not work 
> when his network was behind NAT, so I have to assign a static subnet 
> for him.
>
> From home, sitting behind NAT on my Netgear router, I can turn up PPTP 
> connections all day long.  What gives with FreeBSD and Cisco's 
> implementation of NAT that PPTP doesn't want to work?
>
> Thanks,
>