From: Brian Dennis (brian@5g.net)
Date: Thu Sep 12 2002 - 23:05:12 GMT-3
BIG,
What layer 3 to layer 2 mapping do you have for the local IP address? If
there is no layer 2 address associated with the local IP address on a
BRI interface, how can the router build the packet? You need a layer 3
to layer 2 mapping for multipoint interfaces (BRI). If you use
point-to-point interfaces (dialer) all traffic is automatically sent to
the remote side and no mapping is needed. Once the remote side receives
the traffic it'll send it back.
You can map the local IP address to the remote side's phone number and
it will work assuming that the remote side is working properly. You
could also map your local IP address to your own phone number assuming
you have two B channels and you should be able to call in on the other B
channel and ping yourself.
Lastly the debug command you needed was "debug ip packet". It would have
shown you the encapsulation failures (i.e. unable to map layer 3 to
layer 2).
Brian Dennis, CCIE #2210 (R&S/ISP Dial)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
BIGB97750@aol.com
Sent: Thursday, September 12, 2002 6:24 PM
To: ccielab@groupstudy.com
Subject: ISDN question
Greetings,
Can anyone explain this to me? When I have the bri0 interface connected
across ISDN link to another router with a bri, why can't I ping the
local bri
interface. If I ping the remote routers bri0 it works fine, and all the
other
active interfaces work as well (serial, ethernet). I tried using
extended
ping and debugging ip icmp but I don't get a reponse.
BIG
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