Frustrating VPN Issues with Linksys RT31P2

Discussion in 'Networking Issues' started by darkfiber1010, Apr 23, 2005.

  1. darkfiber1010

    darkfiber1010 Network Guru Member

    Hey guys, I stumbled accross this forum and it seems like many knowlegable people vist here so I thought I'd give it a shot. I have a PPTP VPN connection error 721 "Remote Host Unreachable" when trying to connect to my Windows XP Pro VPN sever behind the Linksys router. Below is everything you should need to know to help me, but if anything else would assist you, let me know please.

    Linksys RT31P2 Broadband VoIP Router:
    Firmware 1.28.00
    Static WAN address 68.x.x.x
    DHCP turned on for LAN, however staic address for VPN server is excluded from DHCP pool
    VPN Pass-through enabled for all
    Port 1723 forwarded to the VPN server’s static LAN address
    Port 47 forwared to the VPN server's static LAN address
    (I know 47 is a GRE which is not the same as UDP/TCP port and is supposed to be enabled by the VPN passthough instead, however linksys's tech support suggested opening UDP/TCP port 47 anyways...sigh)

    VPN Server:
    Windows XP Pro SP2
    Static LAN address 192.168.x.x
    Windows firewall is disabled

    VPN Client Machines:
    Windows XP Pro SP2
    Windows firewall is disabled, and no other firewall is interfearing

    Putting the VPN server in a DMZ doesn't change anything, however connecting the VPN server directly to the cable modem does work therefore I know its something with the router.

    I've tried two registry edits on the client side that were suggested by microsoft to deal with possilbe NAT issues:;en-us;271731;en-us;818043
    (I think this last one only applies to L2TP/IPSEC, but at this point I will do anything)

    I'm honestly starting to think its some kind of unsolvable NAT/VPN issue, if anyone has ideas please let me know. Sorry for the lengthy post. Thanks, Jon Hetrick
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