From: Nigel.Johnson@barclayscapital.com
Date: Wed Jan 23 2008 - 04:58:00 ARST
Hi Bala,
The ICMP Time-to-live exceeded packet that's returned to you contains
the original IP header and ICMP header as a payload to enable you to
determine exactly which traceroute this is a response to.
Regards
Nigel Johnson
CCIE# 13514
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
BALAKRISHNAN Balaji
Sent: 22 January 2008 23:02
To: ccielab@groupstudy.com
Subject: Traceroute question
Group,
I have a question on the traceroute. When doing the traceroute,
intermediate routers sends back the ICMP "time exceeded" reply with its
own source-ip. How the router could correlate this reply to the
original trace route request ?? I could be sending multiple
simultaneous traceroutes ! What is the mechanism used here that makes
router to correlate the icmp exceeded reply coming from an intermediate
router to a specific trace-route request ??
- Bala.
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