Re:

We need long and boring to understand, or at least a topology.

Debug ip routing only works and helpful with dynamic protocols and sometimes provides helpful output but mostly during a clear ip route *.

There are too any factors here like static routing, ZBFW, QoS, etc.

My suggestion without what is between R4 and R2 is to source a ping in the direction it's not working, to each hop and see where it stops. Maybe I e way it's following a default route, but the opposite way it doesn't have a return route.

Regards,
Jay McMickle- CCIE #35355 (R&S)
Sent from iJay

On Jul 5, 2012, at 7:03 AM, <mohd-mousa_at_hotmail.com> wrote:

> Hi Folks.
>
> I have strange behaivor while I was labbing today,when i tried to ping
> from R2 lo0 to router R4 fas0/0 ( there is multiple redis between them )
> the ping doesn't happen, but when i did the ping from f0/0 of R4 to R2 lo0
> the pinging was fine..
>
>
> I tried to trace and debug ip icmp, the result showed that R4 received the
> packet and stopped there,
>
> This is the output :
>
> ICMP: time exceeded (time to live) sent to 10.10.10.5 (dest was 10.10.10.6)
> time exceeded (time to live) sent to 10.10.10.5 (dest was 10.10.10.6)
> time exceeded (time to live) sent to 10.10.10.2 (dest was 216.100.1.6)
> ICMP: time exceeded (time to live) sent to 10.10.10.2 (dest was 216.100.1.6)
> ICMP: time exceeded (time to live) sent to 10.10.10.4 (dest was 10.10.10.6)
> ICMP: time exceeded (time to live) sent to 10.10.10.2 (dest was 216.30.100.5)
> ICMP: time exceeded (time to live) sent to 10.10.10.2 (dest was 216.30.100.5)
> ICMP: time exceeded (time to live) sent to 10.10.10.2 (dest was 216.30.100.5)
>
> Guys,my console was hangging from the output, could any one tell me
> whats the meaning of this output ?
>
> could this relate to routing loops, i turned debug ip routing but didn't see
> route flapping ?
>
>
> I made multiple redistribution but not on this router!!!
> any additional configration will be happy to provide, but i don't want to make
> my post long and boring.
>
>
>
> Thanks in advance.
>
>
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Received on Thu Jul 05 2012 - 07:29:41 ART