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From: Michael Tuexen <Michael.Tuexen@lurchi.franken.de>
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Date: Wed, 6 Jun 2012 19:54:26 +0200
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To: Adrian Chadd <adrian@freebsd.org>
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Subject: Re: IP_RECVTOS
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On Jun 6, 2012, at 7:17 PM, Adrian Chadd wrote:

> Hi,
>=20
> For TCP, I've seen the network layer change things (eg setting bits on
> incoming traffic to mark which interface it came in on), so you can't
> guarantee the outbound ToS =3D=3D inbound ToS.
I've not said that inbound =3D=3D outbound... I just wanted to make =
clear
that there is a socket option of setting the TOS byte for outgoing
traffic. The TCP stack might overwrite the ECN bits...

I need the IP_RECVTOS functionality for implementing a transport stack =
supporting
ECN in userland, actually running the SCTP kernel sources (with some =
glue code)
in userland on top of UDP...

Best regards
Michael
>=20
>=20
>=20
> Adrian
>=20