Re: "RFC 2461bis" issue: MTU handling

[Mark Smith <ipv6@c753173126e0bc8b057a22829880cf26.nosense.org>]

On Tue, 28 Oct 2003 11:36:58 +0100 (CET)
Erik Nordmark <Erik.Nordmark@sun.com> wrote:

> Just to restate what you are saying differently so that others might understand
> it. Today with have a MTU specified in the IPv6 over foo documents.
> We have an MTU option in router advertisements that can be used to
> lower that number - which is useful(?) for the last century problem of
> bridging Ethernet and FDDI together with half-broken fragmenting
> bridges - can get the FDDI attached nodes to use 1500.
> 

A minor note, being able to shrink the MTU on a link via a RA is would be very useful for avoiding packet fragmentation / PMTUD if the majority of traffic originating on that link is going to be encapsulated in a tunnel when going off-link eg VPN using ipsec, gre, etc.

Regards,
Mark.

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