option 212 for 6RD

Gert Doering gert at space.net
Thu Jan 24 16:32:06 CET 2013


On Thu, Jan 24, 2013 at 02:58:31PM +0000, Trevor Warwick (twarwick) wrote:
> In IOS 15.2(4)M and later, the "ip tcp adjust-mss" command will also cause the same configured value to be used for adjusting IPv6 TCP connections. 
> There's currently no modification applied to take account of the different IPv4/IPv6 network layer header sizes.

That seems to be... a bit silly.  What's correct for a given MTU and IPv4
TCP will be 20 bytes too big for IPv6 - and surprising as well.

(Also, introducing this in the middle of an "M" train is in strong
violation of POLA... is there a process to get IOS coders moved to 
first-level support for a few months, so they understand what damage
they do?)

Gert Doering
        -- NetMaster
have you enabled IPv6 on something today...?

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