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debug ip icmp-----ping command

 
 
Paul.Parish@gmail.com
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      05-27-2007
Just to clarify, I'm running Dynamips(just in case someone thinks
Dynamips is causing the problem)


I'm looking at icmp traffic with the debug ip icmp command, but I
never get the assumed output.


For instance...

I ping the neighboring serial interface and only see ICMP echoes
received, not ICMP echoes sent.
The neighboring interface shows echoes replies sent, which is good.


Also every source on the internet says when you ping your own serial
interface the icmp traffic crosses the serial link
When I try to ping my own serial interface I only get traffic on my
interface, not the neighboring router.
I tried debug ip packet and debug ip icmp on the neighboring router
and got nothing. I even checked the counters and show ip traffic.

If anyone can clarify this problem let me know...

Thanks,
Paul

 
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Martin Gallagher
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      06-05-2007
On Sat, 26 May 2007 19:08:11 -0700, Paul.Parish wrote:

>
> I ping the neighboring serial interface and only see ICMP echoes
> received, not ICMP echoes sent.
> The neighboring interface shows echoes replies sent, which is good.
>

This is normal - not sure why.

>
> Also every source on the internet says when you ping your own serial
> interface the icmp traffic crosses the serial link
> When I try to ping my own serial interface I only get traffic on my
> interface, not the neighboring router.
> I tried debug ip packet and debug ip icmp on the neighboring router
> and got nothing. I even checked the counters and show ip traffic.
>


Works for me, if I turn in process switching on the interface.

Network#sh ip int brief | e down
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 192.168.88.44 YES NVRAM up up
Serial2/0 192.168.44.2 YES NVRAM up up
Network#
Network#deb ip pa det
IP packet debugging is on (detailed)
Network#
Jun 5 23:27:13.182 AEST: IP: tableid=0, s=192.168.44.1 (Serial2/0), d=192.168.44.1 (Serial2/0), routed via RIB
Jun 5 23:27:13.182 AEST: IP: s=192.168.44.1 (Serial2/0), d=192.168.44.1 (Serial2/0), len 100, redirected
Jun 5 23:27:13.182 AEST: ICMP type=8, code=0
Jun 5 23:27:13.182 AEST: IP: tableid=0, s=192.168.44.2 (local), d=192.168.44.1 (Serial2/0), routed via RIB
Jun 5 23:27:13.182 AEST: IP: s=192.168.44.2 (local), d=192.168.44.1 (Serial2/0), len 56, sending
Jun 5 23:27:13.182 AEST: ICMP type=5, code=1
Jun 5 23:27:13.182 AEST: IP: s=192.168.44.1 (Serial2/0), d=192.168.44.1 (Serial2/0), g=192.168.44.1, len 100, forward
Jun 5 23:27:13.182 AEST: ICMP type=8, code=0
Jun 5 23:27:13.202 AEST: IP: tableid=0, s=192.168.44.1 (Serial2/0), d=192.168.44.1 (Serial2/0), routed via RIB
Jun 5 23:27:13.202 AEST: IP: s=192.168.44.1 (Serial2/0), d=192.168.44.1 (Serial2/0), len 100, redirected
Jun 5 23:27:13.202 AEST: ICMP type=0, code=0
Jun 5 23:27:13.202 AEST: IP: s=192.168.44.1 (Serial2/0), d=192.168.44.1 (Serial2/0), g=192.168.44.1, len 100, forward
Jun 5 23:27:13.202 AEST: ICMP type=0, code=0
Network#u all
All possible debugging has been turned off
Network#
Network#
Network#sh runn int s2/0
Building configuration...

Current configuration : 111 bytes
!
interface Serial2/0
ip address 192.168.44.2 255.255.255.252
no ip route-cache
serial restart-delay 0
end

Network#

--
Rgds,
Martn
 
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