Date: Fri, 31 Jul 2009 22:10:48 GMT From: kause lotski <kauselot@yahoo.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/137317: logs full of syncache problems Message-ID: <200907312210.n6VMAm7E046823@www.freebsd.org> Resent-Message-ID: <200907312220.n6VMK4Jm063085@freefall.freebsd.org>
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>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<FIN,ACK>; 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<FIN,ACK>; 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<RST>; 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<SYN>; _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<ACK>; 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<RST>; 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<FIN,ACK>; 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<FIN,ACK>; 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<FIN,ACK>; 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:
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