We have a point to point tunnel. This was working fine until today afternoon and since then it stopped working I cannot figure out what happened. I can ping the LAN side of other side just fine when I am pinging from within router after telnet to it but I cannot ping it from our LAN of after attaching single computer to FastEthernet0.
After attaching the computer towards FastEthernet0 I can ping the interface FastEthernet0 and I can also ping the interface Serial0?s IP but I cannot ping it to the other side?s interface Serial0.
After I telnet to my router I can ping my side of LAN their side of router and their side of LAN. Any help will greatly be appreciated.