option 212 for 6RD

[Lorenzo Colitti]

On Tue, Jan 15, 2013 at 5:04 PM, Tore Anderson <tore at fud.no> wrote:

> > With TCP the client advertised MSS will be derived from the IPv6 MTU,
> > so the server will never send 1500 byte packets on TCP.
>
> So the RA LAN MTU trick really only helps TCP, correct? What is gained
> from lowering the LAN MTU by means of RA, rather than rewriting the TCP
> MSS field as we've "always" done in IPv4?
>

It will also give the the host information that it can use to avoid
IPv6-layer fragmentation for UDP packets. Given data showing that
IPv6-layer fragmentation fails a very significant percentage of the time,
this is helpful.
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