[Iccrg] RE: [tsv-area] Testing ECN support for UDP flows

[toby.moncaster]

I've been doing some similar tests on setting the "reserved" flag in the IP header (evil bit) and have given up trying to do it in Windows since they have blocked a lot of access to the raw IP socket...

Toby

____________________________________________________________________ 
Toby Moncaster, <toby.moncaster at bt.com> Networks Research Centre, BT 
B54/70 Adastral Park, Ipswich, IP53RE, UK.  +44 7918 901170 



> -----Original Message-----
> From: iccrg-bounces at cs.ucl.ac.uk [mailto:iccrg-bounces at cs.ucl.ac.uk] On
> Behalf Of Ingemar Johansson S
> Sent: 24 August 2009 07:22
> To: Piers O'Hanlon
> Cc: iccrg; tsv-area
> Subject: [Iccrg] RE: [tsv-area] Testing ECN support for UDP flows
> 
> Hi
> 
> Thanks for the input, seems like it is just an unnecessary complication
> to run on an MS-Windows PC.
> 
> /Ingemar
> 
> > -----Original Message-----
> > From: p.ohanlon at gmail.com [mailto:p.ohanlon at gmail.com] On
> > Behalf Of Piers O'Hanlon
> > Sent: den 21 augusti 2009 11:40
> > To: Ingemar Johansson S
> > Cc: tsv-area; iccrg; Colin Perkins; carlberg; Mikael Abrahamsson
> > Subject: Re: [tsv-area] Testing ECN support for UDP flows
> >
> > 2009/8/21 Mikael Abrahamsson <swmike at swm.pp.se>:
> > > On Fri, 21 Aug 2009, Ingemar Johansson S wrote:
> > >
> > >> Tried with an MS-Windows version of tracert (ftrace), it
> > was supposed
> > >> to be able to set the ToS field. However it seems like when I run
> > >> wireshark that the modified ToS field does not stick, it could be
> > >> some Windows specific feature that simply clears the ToS field. I
> > >> will try some traceroute tests on our Linux boxes next
> > week when I really start working.
> > >> It could be that this will do.
> > >
> > > http://technet.microsoft.com/en-us/magazine/2007.02.cableguy.aspx
> > >
> > > In some versions of Windows you have to change the registry to be
> > > allowed to set any TOS bits, perhaps this is what's missing?
> > >
> > Yes and as Jonathon Lennox pointed out in the AVT WG it's no
> > longer possible  to set the TOS bit directly in Vista (the
> > registry tweak no longer works) as mentioned in the above
> > article. It seems one has to use their QoS APIs and I don't
> > think they allow you to touch the ECN bits.
> >
> > Piers
> >
> > > --
> > > Mikael Abrahamsson    email: swmike at swm.pp.se
> > >
> >
> 
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