From owner-freebsd-bugs@FreeBSD.ORG Fri Jul 31 22:20:05 2009 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E5E831065672 for ; Fri, 31 Jul 2009 22:20:04 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id C1F5D8FC19 for ; Fri, 31 Jul 2009 22:20:04 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.14.3/8.14.3) with ESMTP id n6VMK43V063096 for ; Fri, 31 Jul 2009 22:20:04 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.3/8.14.3/Submit) id n6VMK4Jm063085; Fri, 31 Jul 2009 22:20:04 GMT (envelope-from gnats) Resent-Date: Fri, 31 Jul 2009 22:20:04 GMT Resent-Message-Id: <200907312220.n6VMK4Jm063085@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, kause lotski Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8335E1065670 for ; Fri, 31 Jul 2009 22:10:48 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (www.freebsd.org [IPv6:2001:4f8:fff6::21]) by mx1.freebsd.org (Postfix) with ESMTP id 71DF98FC0C for ; Fri, 31 Jul 2009 22:10:48 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.14.3/8.14.3) with ESMTP id n6VMAmvA046824 for ; Fri, 31 Jul 2009 22:10:48 GMT (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.14.3/8.14.3/Submit) id n6VMAm7E046823; Fri, 31 Jul 2009 22:10:48 GMT (envelope-from nobody) Message-Id: <200907312210.n6VMAm7E046823@www.freebsd.org> Date: Fri, 31 Jul 2009 22:10:48 GMT From: kause lotski To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.1 Cc: Subject: kern/137317: logs full of syncache problems X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 31 Jul 2009 22:20:05 -0000 >Number: 137317 >Category: kern >Synopsis: logs full of syncache problems >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Jul 31 22:20:03 UTC 2009 >Closed-Date: >Last-Modified: >Originator: kause lotski >Release: 7.2. p1 >Organization: >Environment: my.domain 7.2-RELEASE-p1 FreeBSD 7.2-RELEASE-p1 #1: Sat Jun 27 00:09:26 CEST 2009 root@server.domaibn:/usr/obj/usr/src/sys/KAUSKERNEL i386 >Description: My logs are beeind flooded with messages like this: Jul 31 23:58:00 premetenec kernel: TCP: [213.253.92.100]:11711 to [xxxxxxxx]:80 tcpflags 0x11; syncache_expand: Segment failed SYNCOOKIE authentication, segment rejected (probably spoofed) Aug 1 00:00:37 premetenec kernel: TCP: [213.253.92.100]:30837 to [xxxxxxxx]:80 tcpflags 0x11; syncache_expand: Segment failed SYNCOOKIE authentication, segment rejected (probably spoofed) Aug 1 00:00:41 premetenec kernel: TCP: [83.218.196.142]:1579 to [xxxxxxxx]:25 tcpflags 0x4; syncache_chkrst: Spurious RST without matching syncache entry (possibly syncookie only), segment ignored Aug 1 00:00:52 premetenec kernel: TCP: [193.198.80.29]:2524 to [xxxxxxxx]:80 tcpflags 0x2; _syncache_add: Received duplicate SYN, resetting timer and retransmitting SYN|ACK Aug 1 00:01:01 premetenec kernel: TCP: [190.109.157.30]:15396 to [91.185.206.35]:25 tcpflags 0x10; syncache_expand: Segment failed SYNCOOKIE authentication, segment rejected (probably spoofed) Aug 1 00:01:01 premetenec kernel: TCP: [xxxxxxxx]:3353 to [xxxxxxxx]:995 tcpflags 0x4; syncache_chkrst: Spurious RST without matching syncache entry (possibly syncookie only), segment ignored Aug 1 00:01:05 premetenec kernel: TCP: [213.253.92.100]:12391 to [xxxxxxxx]:80 tcpflags 0x11; syncache_expand: Segment failed SYNCOOKIE authentication, segment rejected (probably spoofed) Aug 1 00:02:55 premetenec kernel: TCP: [213.253.92.100]:9833 to [xxxxxxxx]:80 tcpflags 0x11; syncache_expand: Segment failed SYNCOOKIE authentication, segment rejected (probably spoofed) Aug 1 00:03:54 premetenec kernel: TCP: [213.253.92.100]:6298 to [xxxxxxxx]:80 tcpflags 0x11; syncache_expand: Segment failed SYNCOOKIE authentication, segment rejected (probably spoofed) Among ip's that are creating this are: my ip, servers own ip, and google! Nearly all messages are apache or pop3-ssl related. sysctl net.inet.tcp.log_debug=0 does nothing. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted: