On Apr 13, 2011, at 9:44 PM, Dave Taht wrote: > In my travels this month I have been testing ECN enablement at homes and > hotels everywhere I go. > > Until today, I was able to have the following settings for ECN on my laptop > everywhere I've been. > > net.ipv4.tcp_ecn=1 > #net.ipv6.tcp_ecn=0 > net.ipv4.tcp_sack=1 > net.ipv4.tcp_dsack=1 > > However, I got to visit Brian Clapper [1] (friend/co-author of gnugol) > tonight, and discovered that his fairly recently purchased router, a: > > Etherfast Cable/DSL router Model BEFSR41 > Firmware version 2.0.0.4 > > flat out refused to pass ECN enabled connection attempts (returning an ICMP > unreachable message) > > He'd not noticed the problem because ubuntu 10.4 (at least, he also runs bsd) > has tcp_ecn=2, which so far as I know "tries" a ECN enabled connect then > falls back to not using it. > > I'm bummed that such a recent router doesn't pass ECN, and will look into the > problem further in the morning. > > So I think we must use tcp_ecn = 1 to TEST to make sure ECN is being passed, > and tcp_ecn=2 as the default recommendation. > > Perhaps we can synthesize TCP streams to more directly test ECN capability in > the future somehow as part of our testing tools. Are there any tools that > synthesize TCP/ip we could use as a starting point?
Are you looking for something like this? http://www.icir.org/tbit/index.html#ECN Regards, -- Rui Paulo _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
