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On Tue, 4 Nov 2008, Daniel J Blueman wrote: > Is it time to enable TCP ECN per default and get the benefits, since > router support has been around and known-about for really considerable > time? I think enabling ECN by default is a bad idea. Looking at the largest core router vendor out there: http://www.cisco.com/en/US/docs/ios/12_2t/12_2t8/feature/guide/ftwrdecn.html#wp1031751 ECN has to actually be turned on in the routers along the way, it's not default behaviour. No ISP I know of does this, but I can do a poll of other ISP engineers in case more information is wanted. So the upside of enabling it is minimal (I'd gladly see data proving the opposite) and the downside is a lot of trouble with lots of older devices which behave badly when ECN is enabled. -- Mikael Abrahamsson email: swmike@swm.pp.se | ||||||||||
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