[cisco-nas] Dialup Routing Q

[Voralt]

That only works if there is a separate dialer interface designated for each
dial peer, which there isn't in our case.


----- Original Message -----
From: <atticus at the.satanic.org>
To: "Voralt" <peder at voralt.net>
Sent: Sunday, July 06, 2003 11:05 PM
Subject: Re: [cisco-nas] Dialup Routing Q


>
> Point your statics to the dialer interface(s) -- that way the routes will
> actually be removed when the dialer is down, and likewise your summary
> to null0 will be hit..
>
>
> On Sun, 6 Jul 2003, Voralt wrote:
>
> > I have a dialup routing question.
> >
> > Say I have several users dialing in via ISDN.  They each have a class C
from
> > the 172.16.x.x block and on the main site router I have the following
> > routes:
> >
> > ip route 172.16.1.0 255.255.255.0 172.16.1.1
> > ip route 172.16.2.0 255.255.255.0 172.16.2.1
> > ip route 172.16.3.0 255.255.255.0 172.16.3.1
> > ip route 0.0.0.0 0.0.0.0 1.1.1.1
> >
> >
> > Each remote router is either 1.1, 2.1 or 3.1.  The users dialin ok and
> > everything works fine, but if they are not connected, I am wondering
what
> > happens to data destined for their network.  So if the ISDN user at 1.1
is
> > not dialed in, the static route is still there, but it appears that the
data
> > is sent out the default route, which then sends it back in and the TTL
> > eventually expires.  I also have a summary static set to NULL0, which I
> > would think would drop the traffic, but that doesn't appear to be the
case.
> >
> > ip route 172.16.0.0 255.255.0.0 NULL0 240
> >
> > Can anybody explain exactly what's happening?  To summarize one more
time, a
> > central router has all of the routes listed above.  Traffic is sent to
> > 172.16.1.1, but that router is not dialed in at the moment, so what
happens
> > to traffic destined for that network?
> >
> > Thanks in advance.
> >
> > Peder
> >
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> >
>
>
>