option 212 for 6RD

Kurt Jaeger ipv6-ops at c0mplx.org
Fri Jan 18 13:55:18 CET 2013


> > I disagree, at least when used with IPv6. My understanding is
> > that if there are two routers on the link, each advertising its own
> > /64 using RA, clients making GUA using SLAAC, I expect each of these
> > /64 (and derived default route) to have different MTU even though
> > they are in the same L2 domain.

> > Do you disagree?

> that would result in hosts switching from one MTU to the other.
> and the routers reporting inconsistent information being advertised
> on the link.
> RFC4861, 6.2.7.

> MTU is a link property, not a per prefix property.

On FreeBSD 9.1, netstat -rWan shows per-prefix MTUs. So it might
be useful and possible.

pi at opsec.eu            +49 171 3101372                         7 years to go !

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