debug ip icmp-----ping command

Discussion in 'Cisco' started by Paul.Parish@gmail.com, May 27, 2007.

  1. Guest

    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
     
    , May 27, 2007
    #1
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  2. 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
     
    Martin Gallagher, Jun 5, 2007
    #2
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