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Message-ID: <4FA443B6.9010106@hp.com> Date: Fri, 04 May 2012 14:01:42 -0700 From: Rick Jones <rick.jones2@...com> To: Eric Dumazet <eric.dumazet@...il.com> CC: David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>, Perry Lorier <perryl@...gle.com>, Matt Mathis <mattmathis@...gle.com>, Yuchung Cheng <ycheng@...gle.com>, Neal Cardwell <ncardwell@...gle.com>, Tom Herbert <therbert@...gle.com>, Wilmer van der Gaast <wilmer@...gle.com>, Dave Täht <dave.taht@...ferbloat.net>, Ankur Jain <jankur@...gle.com> Subject: Re: [PATCH net-next] tcp: be more strict before accepting ECN negociation > > Interesting indeed ;) > > Did you check if it was spoofed ? > > (did the 3WHS really completed) Well, the tcpdump command was still: tcpdump -i eth0 -vvv '(tcp[tcpflags]& tcp-syn != 0)&& (ip[1] != 0x0)' I didn't see any SYN|ACKs go out, but netperf.org would have had to set ECT for me to see a SYN|ACK going out. FWIW, this is on a 2.6.31-15 (Ubuntu) kernel with net.ipv4.tcp_ecn = 2 and I don't think the SYNs themselves were negotiating ECN: 13:26:16.866007 IP (tos 0x3,CE, ttl 41, id 28850, offset 0, flags [DF], proto TCP (6), length 64) somesystemin.de.55363 > www.netperf.org.www: Flags [S], cksum 0x4cfc (correct), seq 304457158, win 65535, options [mss 1460,nop,wscale rick -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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