Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop

[Andrew Yourtchenko <[e-mail]>]

On Fri, 26 Oct 2012, Mark Andrews wrote:

>> Internet involves developing for the worst case, not the best. If a small
>> but significant enough portion of sites on the Internet drop fragments, then
>> applications will be developed to avoid using fragments. Once applications
>> avoid using fragments to suit some sites on the Internet, then all sites
>> on the Internet may as well drop them, because they've been rendered useles=
>> s.
>
> Or they learn to adapt and use fragments where they work.  DNS clients
> do this today.  They get stuck behind equipment that:
>
> 	* drops packets > 512 bytes
> 	* drops fragments
> 	* drops EDNS packets
> 	* drops packets with DO set
> 	* drops packets where the initial fagment doesn't arrive first
>
> The clients adapt the queries they make to get responses back.
>
> They work much more efficiently however if they can get fragmented EDNS
> responses back.

What about DNSSEC ? Seems like there's a problem if the fragmentation 
does not work correctly: https://tnc2012.terena.org/getfile/1603

--a