Whoever is configured for a negotiated IP
address should receive an IP address from the
remote end (debug ppp neg to confirm what that
address is). This address should be installed
as a host route; however, if there is
no static route or default route pointing to
the ISDN interface, no traffic will
be forwarded to it. We only know as much
as the routing table, and without a routing
protocol or static routes all that we will
know are directly connected addresses. Use "sh ip
route" when you have problems, this will tell you
how much the router knows at that point.
