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I just set up a pptp server on Debian Linux yesterday by following this guide: http://poptop.sourceforge.net/dox/debian-howto.phtml When I tried to connect to the server using both XP and iOS, the client successfully connects to the PPTP server, however, I can't seem to access the Internet thru the pptp connection. When I tried to capture traffic using tcpdump on just the pptp interface itself, I can see only outgoing traffic and no incoming traffic at all. (Please see image)

Wireshark Capture

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more than likely, your internet gateway (router?) does not have a route back to your PPTP gateway. So when a packet comes from x.x.x.x (VPN ip-range) the router throws it to the WAN interface instead of back to the PPTP server.

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  • Actually both the client and the pptp server are located in the same network. I was able to fix the one way issue. However, I forwarded port 1723 on my router but I can't connect to the pptp server from the internet. Any advice?
    – David
    Jan 3, 2012 at 19:28
  • PPTP requires a lot more than just port 1723. You must allow GRE traffic... as well. (GRE is a Protocol... not a port)
    – TheCompWiz
    Jan 3, 2012 at 21:47
  • I never get how to allow gre traffic. I have a Linksys wireless router and the only option I see is VPN pptp passthru and that's enabled.
    – David
    Jan 6, 2012 at 23:15

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