Date: Sun, 13 Aug 2006 13:14:57 -0500 From: Eric Anderson <anderson@centtech.com> To: Troy Settle <troy@psknet.com> Cc: freebsd-isp@freebsd.org Subject: Re: VPN through NAT? Message-ID: <44DF6C21.7080302@centtech.com> In-Reply-To: <44DF3565.1060506@psknet.com> References: <44DF3565.1060506@psknet.com>
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On 08/13/06 09:21, 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, > I'm no expert on the subject, but I recall hitting this in the past and reading about passing GRE packets through, along with a couple of ports to forward to the VPN endpoint. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------
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