From owner-freebsd-questions Mon Aug 27 22:45:44 2001 Delivered-To: freebsd-questions@freebsd.org Received: from www.golsyd.net.au (golsyd.net.au [203.57.20.1]) by hub.freebsd.org (Postfix) with ESMTP id E1DCE37B401; Mon, 27 Aug 2001 22:45:39 -0700 (PDT) (envelope-from kaltorak@quake.com.au) Received: from [203.164.12.28] by www.quake.com.au (NTMail 4.30.0012/AB6169.63.5724aadf) with ESMTP id cqmcaaaa for ; Tue, 28 Aug 2001 15:44:50 +1000 Message-ID: <3B8B30DF.CE0DD233@quake.com.au> Date: Tue, 28 Aug 2001 15:49:19 +1000 From: Kal Torak X-Mailer: Mozilla 4.77 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: deepak@ai.net Cc: FreeBSD-Questions , "freebsd-isp@FreeBSD. ORG" Subject: Re: Interesting Router Question References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Deepak Jain wrote: > > We've got a customer running a FreeBSD router with 2 x 1GE interfaces [ti0 > and ti1]. At no point was bandwidth an issue. > > The router was under some kind of ICMP attack: > > For about 30 minutes: > icmp-response bandwidth limit 96304/200 pps > icmp-response bandwidth limit 97801/200 pps > icmp-response bandwidth limit 97936/200 pps > icmp-response bandwidth limit 97966/200 pps > icmp-response bandwidth limit 98230/200 pps ...snip... No, this is showing that your router was generating a lot of icmp packets, and your kernel was limiting the amount of responses to save bandwidth... You were probably under attack though, it could of been a ping flood or anything that causes your system to reply with icmp packets... Since filtering out icmp packets on the cisco helped it could of been a simple ping flood, since that would of stoped the icmp echo requests from reaching the server... But it also could of been a number of other things... To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message