option 212 for 6RD

Lorenzo Colitti lorenzo at google.com
Wed Jan 16 04:38:03 CET 2013

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.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.cluenet.de/pipermail/ipv6-ops/attachments/20130116/dd669776/attachment.html 

More information about the ipv6-ops mailing list