option 212 for 6RD

[Ivan Pepelnjak]

It definitely doesn't work that way on IOS Classic.

> -----Original Message-----
> From: Tassos Chatzithomaoglou [mailto:achatz at forthnetgroup.gr]
> Sent: Saturday, January 19, 2013 5:07 PM
> To: Ivan Pepelnjak
> Cc: 'Tore Anderson'; 'Daniel Roesen'; ipv6-ops at lists.cluenet.de
> Subject: Re: option 212 for 6RD
> 
> Ivan, i have the impression that in the newest BRAS/BNG platform (ASR9k,
> so it's actually IOS-XR, not IOS), the router uses automatically the IPv4
> TCP MSS configured value minus 20 bytes as the IPv6 TCP MSS value.
> 
> --
> Tassos
> 
> Ivan Pepelnjak wrote on 19/1/2013 17:15:
> > Oh, BTW, there's no "ipv6 tcp adjust-mss" command in Cisco IOS.
> > Problem "solved" ;)
> >
> >> That said, if you read between the lines of the original question, it
> >> suggests:  I have no control over my subscribers' CPEs . Which makes
> >> the LAN MTU solution extremely impractical to deploy. In that
> >> situation, the solution that is the most likely to yield the best
> >> effect, would be to enable TCP MSS clamping for 6RD traffic on the BR
> >> (or somewhere else in the ISP's core network). IMHO.
> >>
> >> --
> >> Tore Anderson
> >
> >