From owner-freebsd-net@FreeBSD.ORG Sun Mar 1 11:41:06 2009 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 50AA210656E7 for ; Sun, 1 Mar 2009 11:41:06 +0000 (UTC) (envelope-from stutiredboy@gmail.com) Received: from ti-out-0910.google.com (ti-out-0910.google.com [209.85.142.191]) by mx1.freebsd.org (Postfix) with ESMTP id DE4058FC13 for ; Sun, 1 Mar 2009 11:41:05 +0000 (UTC) (envelope-from stutiredboy@gmail.com) Received: by ti-out-0910.google.com with SMTP id a1so2493370tib.3 for ; Sun, 01 Mar 2009 03:41:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from :user-agent:mime-version:to:cc:subject:references:in-reply-to :content-type:content-transfer-encoding; bh=rgm8d43b3DiwC/7BAS9wNKtU/Yoq7HWPXKxlL5tgLmA=; b=Tl/OFKm9CN9J8dWQNHI6ghMJyee8+yQ4tp2jon7on/12Wd6QFFqlmd7UzX2FPkQww9 8KV1ifl5cPeL+uoXN46XysJTLZa7LDWA6AWUn26y8jxQcxxg7ykvzVULv3Zm/cVMHqMs ScD5sDfqXY4X/X7VIXIbDd5bOl8mPpI3IU2p0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; b=xrpqKqI84PMN+8E/03ajDOcIxUCpHZ//FJtBcZnFUysyTRQhCfiNC0sBX5qpLmIjax xokUz+ZJMUNhhet5pmnKfi5R6kO53bVGuK+KA2eWIyu5mO71lzg4pMfMnvxq/0ZRPgca wb3+RX5L8ieoZfcuMEeHoHNtoSyACaW6QkMHQ= Received: by 10.110.7.18 with SMTP id 18mr364121tig.46.1235907664800; Sun, 01 Mar 2009 03:41:04 -0800 (PST) Received: from ?192.168.1.203? ([58.62.99.98]) by mx.google.com with ESMTPS id 25sm7178107tif.32.2009.03.01.03.41.03 (version=TLSv1/SSLv3 cipher=RC4-MD5); Sun, 01 Mar 2009 03:41:03 -0800 (PST) Message-ID: <49AA744D.8060407@gmail.com> Date: Sun, 01 Mar 2009 19:41:01 +0800 From: stutiredboy User-Agent: Mozilla-Thunderbird 2.0.0.19 (X11/20090103) MIME-Version: 1.0 To: Adrian Penisoara References: <49AA352E.5060803@gmail.com> <78cb3d3f0903010301y5d8bbaf9r4a285653688d74ca@mail.gmail.com> In-Reply-To: <78cb3d3f0903010301y5d8bbaf9r4a285653688d74ca@mail.gmail.com> Content-Type: text/plain; charset=GB2312 Content-Transfer-Encoding: 8bit Cc: freebsd-net@freebsd.org Subject: Re: crazy network problem -- sleep? X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Mar 2009 11:41:06 -0000 Adrian Penisoara дµÀ: > Hi, > > 2009/3/1 stutiredboy > > > hi,all: > > recently , we found a problem that , some server which with FreeBSD > 6.2 may stop networking after > days of services, it is so difficulty express this status, e, such as > sleep? i can not ping this server, tracert is also > failure, and other services ,network/server seems to be down... but > while i insert the keyboard/mouse/crt in , > everything is ok, such as a ring to call the system to wake-up... no > errors found in dmesg or /var/log/messages, > such as nothing happened...orz£¬our unlimit args as follow: > > cputime unlimited > filesize unlimited > datasize 2088152 kbytes > stacksize 65536 kbytes > coredumpsize unlimited > memoryuse unlimited > vmemoryuse unlimited > descriptors 655000 > memorylocked unlimited > maxproc 5547 > sbsize unlimited > > plz give me some suggestion to trace the problem or solve it . > thanks a > lot ! > > > First you need to check whether packets are reaching the system and > whether the response packets are leaving it with tcpdump(8) on the > appropriate interface. > > If you see the packets coming but not coming out then you need to > check the status of your TCP/IP stack -- e.g. post the output of > "netstat -m" and "netstat -s". Also check dmesg output for any errors. > > If you are using firewall(s) (ipfw/ipfilter/pf) then check the rules > and the firewall states status; try temporarily disabling the firewall > (ipfw disable firewall / ipf -D / pfctl -d) and check whether your > system becomes reachable. > > Check CPU load, interrupts, packet stats (systat -vmstat / systat > -ifstat). > > Regards, > Adrian Penisoara > EnterpriseBSD hi, thank you for your help, i can only ssh to the system, so while the network is down, i can not login in yes, we have ipfw on , these rules have used a long time, and many other severs do not have this problem, this sistutation happened scarce, in different machine rooms, different isps, different servers, such as hp\dell. while the network usable, the cpu and system load is normal, i have checked dmesg and syslog, nothing special found , where our colleague in machine room insert the keyboard or mouse in ,then the network recover , it is so difficult to catch the ouput of tcpdump or other messages form netstat , the moment you have the keyboard connected , the network recover... thanks very much !