Re: [Softwires] MTU problem in DS-lite

["Lee, Yiu" <Yiu_Lee at Cable.Comcast.com>]

Title: Re: [Softwires] MTU problem in DS-lite

Hi Zhen,

In general, the Tunnel-Entry Point and Tunnel-Exist Point should fragment and reassemble the oversize datagram. This mechanism is transport protocol agnostic and work for both UDP and TCP. 

For TCP, we “could” potentially avoid fragmentation by modify MSS option. However, we were required by the Chairs to remove this optimization from the draft in next update.

Thanks,
Yiu


On 8/16/09 3:56 AM, "Zhen Cao" <caozhenpku at gmail.com> wrote:

> Hi Alain and All,
>
> I have a question on MTU issue in ipv4-in-ipv6 softwire. I notice
> Sec.10.2 of DS-Lite draft has discussed the MTU problem. The draft
> introduces one possible way of using TCP MSS option to avoid IP layer
> fragmentation and reassembly. It is a good idea but how about the case
> for UDP sockets? I suppose there should be a general way to handle the
> MTU issue? Thanks for any explanation.
>
> Thanks and regards,
> Zhen
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