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Subject: Re: [RFC] "CIPE ethernet devices should have an MTU of 1500"
From: Lennert Buytenhek <buytenh,AT,gnu,DOT,org>
Date: Tue, 13 Nov 2001 19:44:27 +0100
In-reply-to: <20011101182348.A26389@gnu.org>

On Tue, Nov 06, 2001 at 08:56:34PM +0100, Olaf Titz wrote:

> > group, the CIPE device will have to 'emulate' an MTU of 1500, since a lot 
>of
> > things downright depend on this.  IMHO, the fact that this causes
> > fragmentation at the UDP level is secondary.  For a vanilla IP tunnel I'll
> > buy the argument that not fragmenting the encrypted-and-encapsulated
> > packet is important, but in the case of ethernet, I think the MTU 
>guarantee
> > is sacred.
> >
> > Opinions?
> >
> > I'm using the attached (shoddy) patch for this.  If people agree with me 
>on
> > this I'll make a clean patch, conditional on the protocol version et al.
> 
> That needs a configuration option, IMHO, since it is one of the things
> people might legitimately want either way.

Oh?  Can you give an example?  I honestly can't imagine you would want
to have an ethernet device have an MTU < 1500, but then again, that could
be me..

cheers,
Lennert





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