[96052] in North American Network Operators' Group
Re: Thoughts on increasing MTUs on the internet
daemon@ATHENA.MIT.EDU (Joe Maimon)
Sat Apr 14 22:07:54 2007
Date: Sat, 14 Apr 2007 22:06:45 -0400
From: Joe Maimon <jmaimon@ttec.com>
To: Simon Leinen <simon@limmat.switch.ch>
Cc: Iljitsch van Beijnum <iljitsch@muada.com>,
NANOG list <nanog@merit.edu>
In-Reply-To: <aavefzkfo5.fsf@limmat.switch.ch>
Errors-To: owner-nanog@merit.edu
Simon Leinen wrote:
>
> * Current Path MTU Discovery doesn't work reliably.
>
> Please, let's wait for these more robust PMTUD mechanisms to be
> universally deployed before trying to increase the Internet MTU.
I think this is the proper summary of where we are at: Trying to restore
one of the original design goals of ipv4 -- reliable internetworking of
different MTU sized networks.
But the waiting game doesnt work, act local and think global.
>
> * IP assumes a consistent MTU within a logical subnet.
>
> This seems to be a pretty fundamental assumption, and Iljitsch's
> original mail suggests that we "fix" this.
This is an implementation detail, since local IP nodes have no
conception of remote IP nodes subnet detals.
