[Dnsmasq-discuss] dnsmasq + nat(solved)

richardvoigt at gmail.com richardvoigt at gmail.com
Mon Jan 10 19:43:26 GMT 2011


On Mon, Jan 10, 2011 at 1:40 PM, Nicholas Weaver <nweaver at gmail.com> wrote:

> >
> > Oh nevermind, it affect the TCP option negotiation, so it causes the
> client
> > to send smaller packets.  So it is a general solution for TCP (and only
> > TCP).  For UDP, the mtu still needs to be reduced at the client.
>
> All but linux however do the right thing on UDP and don't send it with
> DF sent, which means it should be refragmented if it goes through a
> bottleneck.  (Of course, ~10% of the systems on the Internet can't
> process UDP fragments, but thats orthoginal (usually) to the PMTU
> problems)
>

How so?  If the sender MTU is set to the PMTU, then fragmentation won't be
needed, and systems that drop fragments won't become an issue.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/attachments/20110110/f41c149d/attachment.htm 


More information about the Dnsmasq-discuss mailing list