--- "Buri, Heather H" <[EMAIL PROTECTED]> wrote:
> Chris,
>
> I believe all the routing protocols have their own unique port
> identifiers.
Close. IP routing protocols *may* use layer 4 sockets for data. But for
identification is the IP protocol type.
> 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.
read RFC 1700
IP header has an 8 bit protocol type field
> 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?
Define manipulate?
> 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?
>
access-list 101 permit ospf any any
where "ospf" is the IP type is one example.
HTH.
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