From: Menga, Justin (Justin.Menga@xxxxxxxxxx)
Date: Tue Sep 11 2001 - 18:04:18 GMT-3
The router sends a UDP packet to the destination IP address starting from
destination UDP port 33434 and increments this number for each packet sent.
The first packet has the IP TTL set to 1 and each subsequent packet
increments this.
Each hop along the way will send back an ICMP TTL Expired in transit message
(ICMP Type 11, Code 0). The final destination should send back an ICMP port
unreachable (ICMP Type 3, Code 3).
Regards
Justin Menga CCIE #6640
Network Solutions Architect
Wireless & E-Infrastructure
Compaq Computer New Zealand
DDI: +64-9-918-9381 Mobile: +64-21-349-599
mailto: justin.menga@compaq.com
web: http://www.compaq.co.nz
-----Original Message-----
From: tim wu [mailto:tim_wu@gz.ctil.com]
Sent: Tuesday, 11 September 2001 3:34 p.m.
To: ccielab
Cc: Menga, Justin
Subject: about traceroute packets of cisco router
Hi,Members
I found cisco use tcp 33434 to trace a route,I want to know its
mechanism.Could you show me? thanks.
I think the following tools can tell me the trueness,but I haven't.
BJ---------------------SJ-------------------NY
e0 | | e0 loop0
| |
| |
sniffer capture _______|
BJ trace a route of NY loop0,decode the packets.
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