[14971] in North American Network Operators' Group
Re: MTU of the Internet?
daemon@ATHENA.MIT.EDU (Bradley Reynolds)
Wed Feb 4 14:15:48 1998
Date: Wed, 4 Feb 1998 14:02:40 -0500 (EST)
From: Bradley Reynolds <brad@baz.org>
To: Dirk Harms-Merbitz <dirk@hermosa.power.net>
cc: nanog@merit.edu
In-Reply-To: <19980204102610.03065@hermosa.power.net>
On Wed, 4 Feb 1998, Dirk Harms-Merbitz wrote:
> Could be related to dialup people wanting lower latencies in
> multiplayer games.
>
> Dirk
>
> On Wed, Feb 04, 1998 at 12:05:29PM -0500, Perry E. Metzger wrote:
> >
> > Peter Ford writes:
> > > Several people have noted to the Microsoft Support and Product groups that
> > > they want the Windows 95 PPP MTU to be set to 576 (down from 1500). this
> > > change is in Windows 98.
> > >
> > > The reason for this change cited by many customers is that many ISPs have
> > > 576 MTUs set "inside" their networks and packets get fragmented.
> >
> > I know of no modern networking media in common use at ISPs that has an
> > MTU below 1000, and have not heard of ISPs with MTUs that low. Also,
> > the ISP's PPP could simply negotiate the MTU down -- it need not
> > accept a large MTU, no matter what Windows would like. The entire
> > story sounds, to say the least, fishy.
> >
> > BTW, if Windows 95 is doing path MTU discovery, it should all be
> > irrelevant.
> >
> > Perry
>
brad reynolds
ber@cwru.edu
