On 6to4 gateway and recommended MTU setting

Jeroen Massar jeroen at unfix.org
Thu Mar 11 12:58:38 CET 2010

Martin Millnert wrote:
> Hello list,
> was discussing best 6to4-relay interface MTU size with a friend and
> basically need more and wiser input.


If you have anything else, you are being silly.

> A working PMTUd will resolve MTU problems, both on underlying IPv4 node
> <-> 6to4-gateway, but this isn't the issue at the moment.

Not in this case. PMTUd will resolve MTU problems on the layer that it
is running, thus IPv6. But that won't affect the IPv4 layer. Remember,
you are tunneling, thus both rules for IPv4 and IPv6 apply.

The better question is actually: why bother with 6to4?

Yes, it is a nice quick deployment strategy, but for anything long term,
go native... (or at least native addresses using 6rd or something).


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