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On Thu, Jun 15, 2006 at 03:59:39PM -0700, Jason Thorpe wrote:
> On Jun 8, 2006, at 11:23 AM, Mihai CHELARU wrote:
> >----- Original Message ----- From: "Quentin Garnier" =20
> ><cube@cubidou.net>
> >To: "Mihai CHELARU" <kefren@netbsd.ro>
> >Cc: <tech-net@netbsd.org>
> >Sent: Thursday, June 08, 2006 9:11 PM
> >Subject: Re: MSS doesn't honour route MTU
> >
> >>Not unless you set net.inet.tcp.mss_ifmtu to 1.
> >
> >No, it's the same:
>=20
> Which is correct.  The MSS is independent of the MTU.  The MSS is a =20
> value advertised to the peer that says "this is the maximum segment =20
> size I am willing to receive".

That's technically true.  However, RFC 1191 Section 3.1 suggests that
the MSS that's sent be derived from the MTU because it "may dissuade a
broken peer from sending enormous datagrams".  Also they say to use=20
"the maximum MTU over its connected networks, for a multi-homed host"
when doing the math.

--=20
Kentaro A. Kurahone
SIGUSR1 Research and Development

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