[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.
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