[109161] in North American Network Operators' Group
Re: ECN
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Fri Nov 7 12:31:34 2008
To: Mikael Abrahamsson <swmike@swm.pp.se>
In-Reply-To: Your message of "Fri, 07 Nov 2008 08:27:58 +0100."
<alpine.DEB.1.10.0811070815360.10993@uplift.swm.pp.se>
From: Valdis.Kletnieks@vt.edu
Date: Fri, 07 Nov 2008 12:31:22 -0500
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
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On Fri, 07 Nov 2008 08:27:58 +0100, Mikael Abrahamsson said:
> for ECN to actually be useful, we (the ISPs) have to turn this option on
> in the routers as well. Is anyone doing this today? What vendors support
> it?
The only thing that's *required* for it to help is that the routers and
firewalls not actually *molest* the bits in the TCP SYN packet. If you pass
them and *do nothing else*, it at least has the potential of being useful at
some other router along the path. And let's face it - if *your* router is
congested enough for ECN to matter, there's a fairly good chance that the
router one hop up/downstream is *also* seeing some effects. Even if *you* don't
do anything else, your neighbor might - helping you out in the bargain.
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