On Thursday 17 April 2008 15:59:47 Jason Stubbs wrote: > On further investigation, the behaviour is the same regardless of whether > it is a VIP or a real host. When a SYN_SENT state exists traffic doesn't > flow. However, if there is no state and an ACK (no SYN) packet arrives, an > ESTABLISHED entry is created such as: > > ipv4 2 tcp 6 431996 ESTABLISHED src=192.168.0.104 dst=192.168.1.3 > sport=20001 dport=80 packets=1 bytes=54 [UNREPLIED] src=192.168.1.3 > dst=192.168.0.104 sport=80 dport=20001 packets=0 bytes=0 mark=0 use=1 > > After this the connection can complete normally. I wonder if this is not a > bug in conntrack handling? It doesn't seem right to me. There's an undocumented (as far as I can tell) sysctl that controls this called net.netfilter.nf_conntrack_tcp_loose which defaults to 1. Turning it off gave the behaviour I expected. -- Jason Stubbs <j.stubbs@xxxxxxxxxxxxxxx> LINKTHINK INC. 東京都渋谷区桜ヶ丘町22-14 N.E.S S棟 3F TEL 03-5728-4772 FAX 03-5728-4773 -- To unsubscribe from this list: send the line "unsubscribe lvs-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
