Two WAN ports are used in dual WAN mode. Everything was working fine. Then I added a protocol binding rule directing all traffic to WAN2 port for one particular IP. From this moment the computer with active protocol redirection started act strangely. Some time after the redirection rule was activated the conection to the hard drive shares on the other end of G2G VPN tunnel was lost. It was no longer possible to connect to these drives. Ping was working fine in both directions, along with the VNC. Everything went back to normal, when the protocol binding got disabled. Both computers are working on Windows 2000 Professional. The disk drive network shares are available through the Microsoft Networking sharing (I think it is the NetBios). In any case the Cisco help line asked me to send them my router config file. Then they tested the pings in both directions, then they told me everything is working fine in their case, and I should send them some better hint. So, in the result I was told to something like "to use Wireshark to find the cause by myself". In any case. Did anyone got any issues with passing the NetBios traffic through G2G VPN in some certain conditions?