Re: (ASCEND) Cisco routers broke under TNT 8.0.1

[Phillip Vandry <vandryp@psi.ca>]

> We just upgraded from 7.0V7 to 8.0.1. Lo and behold, none of our customers
> with Cisco gear can connect anymore. All sessions fail C=185 P=63.
> 
> Packet tracing from both sides reveals the problem. The Cisco's are set up
> for a dummy remote address. In previous releases the Cisco would NAK the
> NAS address being offered by the TNT a few times and finally the TNT would
> give up and say "you win" (the Cisco doesn't really have to have the
> remote, TNT, IP address, it will route the traffic to whatever it thinks
> the remote IP is, which will always be the other end of the PPP link).
> Now, under 8.0.1, the TNT keeps resending and the Cisco keeps NAKing until
> the TNT now CLOSES THE CONNECTION !

Solution: do not configure the Cisco with a hardcoded remote IP address.
Cisco is one of the only router vendors I know of (the other is
Compatible Systems) where you *don't* have to specify a remote IP
address, and I suggest you take advantage of this.

Configure the Cisco with either "ip address negociated" or
"ip unnumbered some_other_interface" and use dialer profiles:

interface Dialer0
  ppp pap sent-username blah blah blah
  ip unnumbered Ethernet0
  dialer string phone_number
  etc..
ip route 0.0.0.0 0.0.0.0 Dialer0

-Phil
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