From: tan (tan@dia.janis.or.jp)
Date: Wed Jan 08 2003 - 08:14:01 GMT-3
Good observation. But I am referring to icmp echo requests leaving source
router, not a forwarding router. Plus, this particulary router below is in
"host" mode (no ip routing, and no ip route-cache), so fast switching is
off. But it did cause me to pause and verify.
You see below, only the reply is output to debug console. If on the far
router I verify in debug that it recieved the echo requests, but also block
replies from leaving, the local router won't show anything in debug ip icmp
output, even though 5 echo requests went out. Just curious why?
Also, anyone know how to get source and destination MAC addresses in debug
mode convienantly like debug ip packet detail with mac?
Router#deb ip icmp
ICMP packet debugging is on
Router#ping 153.1.192.65
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 153.1.192.65, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/21/24 ms
Router#
10:11:38: ICMP: echo reply rcvd, src 153.1.192.65, dst 153.1.192.66
10:11:38: ICMP: echo reply rcvd, src 153.1.192.65, dst 153.1.192.66
10:11:38: ICMP: echo reply rcvd, src 153.1.192.65, dst 153.1.192.66
10:11:38: ICMP: echo reply rcvd, src 153.1.192.65, dst 153.1.192.66
10:11:38: ICMP: echo reply rcvd, src 153.1.192.65, dst 153.1.192.66
Router#
Router#
> -----Original Message-----
> From: Matthew Poole [mailto:matthew.poole@blueyonder.co.uk]
> Sent: Wednesday, January 08, 2003 7:55 PM
> To: tan; Ccielab (E-mail)
> Subject: Re: lack of output in debug ip icmp
>
>
> Debug's are only effective on process switched packets -
> possibly the reason
> why.
>
> To disable fast switching (default) the command is "no ip
> route-cache" or
> similar, probably applied on the interface.
>
> HTH
>
> Mat.
> ----- Original Message -----
> From: "tan" <tan@dia.janis.or.jp>
> To: "Ccielab (E-mail)" <ccielab@groupstudy.com>
> Sent: Wednesday, January 08, 2003 10:39 AM
> Subject: OT: lack of output in debug ip icmp
>
>
> > Is it normal that typical outgoing pings are not output to
> console under
> > "debug ip icmp"? Only return pings and other icmp types are
> included, but
> > not standard echo request. I have been bit a few times just
> assuming my
> ping
> > went out and was troubleshooting the return path, when it
> turned out it
> > never left the router because unroutable. I have found only
> "debug ip pack
> > det" will include outgoing ping? I know not much can be
> done about it, but
> > anyone else find it odd or offer an explanation why?
> > .
.
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