PMTUD broken with ipv6.juniper.net?

Daniel Roesen dr at cluenet.de
Fri Feb 4 08:43:47 CET 2011


Hi,

On Fri, Feb 04, 2011 at 12:37:09AM -0300, Fernando Gont wrote:
> > The DOCSIS model uses RAs with M=1 O=1 and no prefix advertisement on
> > the DOCSIS link between the CMTS and the CPE router to enforce stateful
> > DHCPv6. Reading above paragraph, we cannot advertise a MTU >1500 there
> > to cover for e.g. DS-Lite encaps overhead to make reasonable sure that
> > AFTRs don't need to reassemble tunnel packets.
> 
> Sorry, I don't follow. You want to advertise an MTU>1500 on Ethernet?

Well, sort of. DOCSIS basically emulates Ethernet. So yes, for the
matter of RAs, that's correct.

Best regards,
Daniel

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