Chris,
I believe all the routing protocols have their own unique port identifiers.
I am reading Doyle's Routing TCP/IP Vol 1 right now and it discusses all of
the routing protocols in some detail. RIP uses port 520, IGRP/EIGRP use
protocol 9. Doyle does give examples of packet captures on each of the
different protocols and the port/protocol does indeed show up in the routing
protocol packet header. Overall, I am finding this an extremely good book.
I can see now why so many recommend it.
I don't have a lot of experience manipulating the routing protocols in such
a way as you mention below but I don't see why it could not be done based on
the fact that they do use known port/protocol id's.
Someone else may be able to shed some additional light on this for you.
Heather Buri
-----Original Message-----
From: Kane, Christopher A. [mailto:[EMAIL PROTECTED]]
Sent: Friday, February 23, 2001 9:38 AM
To: '[EMAIL PROTECTED]'
Subject: IP Protocol 89?
In trying to understand OSPF in much more detail, I am reading RFC 2328.
Several times Mr. Moy refers to OSPF as " IP Protocol 89". I checked the
"RFC/Port Number" page that I reference often
(http://www.networksorcery.com/enp/default0301.htm) and found that indeed
OSPF is IP Protocol 89. I have not seen this before. Sure, I've worked with
TCP/UDP port numbers, but this is the first time I've paid attention to the
fact that the protocols themselves have numbers too. This is interesting.
Should I look at 89 as a number that can be manipulated as I would 23
(telnet) or 69 (tftp)? Can someone explain where these numbers are used? Are
they found in headers? As networkers, are we concerned with these numbers?
Does anyone commonly filter based on a protocol's number? Or is getting this
granular an exercise in futility for a network engineer?
Thanks,
Chris
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