[20597] in North American Network Operators' Group
Re: Maybe I'm misreading this but...
daemon@ATHENA.MIT.EDU (Michael Shields)
Sat Oct 17 02:48:06 1998
From: shields@crosslink.net (Michael Shields)
Mail-Copies-To: never
To: Marc Slemko <marcs@znep.com>
Cc: tvo <tvo@EnterZone.Net>, nanog@merit.edu
Date: 17 Oct 1998 06:38:32 +0000
In-Reply-To: Marc Slemko's message of "Fri, 16 Oct 1998 19:52:49 -0700 (PDT)"
In article <Pine.BSF.4.02A.9810161946280.293-100000@localhost>,
Marc Slemko <marcs@znep.com> wrote:
> Note that if there is no MTU change at that point, there is no problem
> because there will never (well, almost never and the almost is dependent
> on having funky/broken routers) be any reason to be unable to fragment at
> that hop.
For this to be ok, you also have to be certain that whenever you add
an interface to that router -- by adding a card, configuring a tunnel,
or anything -- that you stop and check whether you need to renumber
the 1918-using interfaces. For a dialup box, you also need to be sure
it will never create a PPP session with an MTU unequal to the MTU of
all the other interfaces. These things are possible, but it's more
likely that PMTU will be broken because no one will think about it
when adding an interface.
--
Shields, CrossLink.
