DComTalk.com

I have a Nortel 1100 with tunnels up with an ADSL connection. Tunnels
are up with the other end, however, I cannot ping either
private-to-private or public-to-public. I can ping to the public
interface from anywhere else (Internet, another PC) and I can ping the
mgmt tunnel. But I cannot ping from the contivity to anywhere!!
Do anyone know why ?!