Re: [RRG] Six/One Router Design Clarifications

[Pekka Savola <pekkas@netcore.fi>]

(perhaps I shouldn't have done catching up on rrg mails, but..)

On Fri, 25 Jul 2008, Dino Farinacci wrote:
[long list of encap/decap vs translation discussions omitted]
> > You have to do the same with encapsulation.

One thing I didn't see mentioned here is probably relevant. 
Encap/decap has a potential to be much more difficult if fragmentation 
would be incurred (especially outer header fragmentation); I have hard 
time seeing how you could even implement a line-speed decapsulator 
that would reassemble fragments as required by Full Standard IP RFCs.

The same problem could happen if you translated v4->v6 as well (i.e., 
payload size shrinkage).

See draft-touch-intarea-tunnels-00 and rfc4459.

As a result for encap/decap schemes I specifically want to see how 
they 100% avoid fragmentation, or describe how they deal with it.

--
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings

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