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2008 RRAS Site-to-Site VPN

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  • 2008 RRAS Site-to-Site VPN

    So here is the situation:

    I have a pair of Windows Server 2008 Enterprise machines running RRAS, for a site-to-site VPN.
    • Machine A, is used just for the VPN gateway. (The only catch with this machine is it has ONE NIC).
    • Machine B, is used as a NAT and VPN gateway.

    I have successfully setup the site-to-site connection between Machine A and Machine B. Users on both sides can ping each other and traffic is flowing across the VPN properly. However, and here is where the fun begins:

    On (i.e. logged into the console of the respective machine) Machine A or Machine B, I CANNOT ping ANY machine across the VPN, infact pings from Machine A to Machine B (and visca-versa), fail.

    It seems as though all other traffic except from VPN gateway to VPN gateway work's properly. Is there some firewall rule or something I've missed?

    I'm not sure what is going on and I've double checked everything I can think of. Any thoughts from anyone?