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Date: Fri, 12 Oct 2012 13:53:43 -0400 (EDT) From: David Miller <davem@...emloft.net> To: kuznet@....inr.ac.ru Cc: netdev@...r.kernel.org, shawn.lu@...csson.com, eric.dumazet@...il.com, sol@....ru Subject: Re: [PATCH] tcp resets are misrouted From: Alexey Kuznetsov <kuznet@....inr.ac.ru> Date: Fri, 12 Oct 2012 18:34:17 +0400 > After commit e2446eaa.. tcp resets are always lost, when routing is asymmetric. > Yes, backing out that patch will result in misrouting of resets for dead connections > which used interface binding when were alive, but we actually cannot do anything here. > What's died that's died and correct handling normal unbound connections is obviously a priority. > > Comment to comment: >> This has few benefits: >> 1. tcp_v6_send_reset already did that. > > It was done to route resets for IPv6 link local addresses. It was a mistake to > do so for global addresses. The patch fixes this as well. > > Actually, the problem appears to be even more serious than guaranteed loss of resets. > As reported by Sergey Soloviev <sol@....ru>, those misrouted resets create a lot of > arp traffic and huge amount of unresolved arp entires putting down to knees NAT firewalls > which use asymmetric routing. > > Signed-off-by: Alexey Kuznetsov <kuznet@....inr.ac.ru> Applied and queued up for -stable, thanks! -- 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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