On Wed, 2004-08-04 at 11:25, Jack Bowling wrote: > On Tue, Aug 03, 2004 at 08:14:25PM -0400, Ben Vitale wrote: > <snip > > > Without any changes to kernel 2.6.6-1.435.2.3, > > > > [bvitale@vandelay ~]$ cat /proc/sys/net/ipv4/tcp_ecn > > 0 > > [bvitale@vandelay ~]$ > > > > > > [bvitale@vandelay ~/ecncheck]$ ecncheck 68.48.0.6 53 > > With ECN: Connection accepted by ns02.rtchrd01.md.comcast.net > > [68.48.0.6] at hop #7 > > Without ECN: Connection accepted by ns02.rtchrd01.md.comcast.net > > [68.48.0.6] at hop #7 > > WARNING: Host doesn't support ECN but fails gracefully > > [bvitale@vandelay ~/ecncheck]$ > > > > Not sure how to interpret that? > > By some chance are you using conntrack?