From owner-freebsd-security@FreeBSD.ORG Fri May 7 09:09:31 2004 Return-Path: Delivered-To: freebsd-security@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8127316A4CE for ; Fri, 7 May 2004 09:09:31 -0700 (PDT) Received: from out009.verizon.net (out009pub.verizon.net [206.46.170.131]) by mx1.FreeBSD.org (Postfix) with ESMTP id 557FC43D60 for ; Fri, 7 May 2004 09:09:30 -0700 (PDT) (envelope-from cswiger@mac.com) Received: from mac.com ([68.161.84.3]) by out009.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20040507160929.QKEN29216.out009.verizon.net@mac.com>; Fri, 7 May 2004 11:09:29 -0500 Message-ID: <409BB4B0.5000904@mac.com> Date: Fri, 07 May 2004 12:09:20 -0400 From: Chuck Swiger Organization: The Courts of Chaos User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7b) Gecko/20040421 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Matt Gostick References: <001001c4316f$6ab193d0$cb01a8c0@haklot> In-Reply-To: <001001c4316f$6ab193d0$cb01a8c0@haklot> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Authentication-Info: Submitted using SMTP AUTH at out009.verizon.net from [68.161.84.3] at Fri, 7 May 2004 11:09:29 -0500 cc: freebsd-security@freebsd.org Subject: Re: scheduled pings X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Security issues [members-only posting] List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 May 2004 16:09:31 -0000 Matt Gostick wrote: > I have just setup some ipfw rules to checkout some traffic to one of my > boxes. I have three servers, only one of which has weird traffic. It > is getting ping'd on a five minute interval from approx 3 to 8 different > ip addresses within the same second. For example: [ ... ] > I've just started denying pings to the box... There are a bunch of network monitoring tools which will do something like this, normally used by ISPs and the like to verify that a server is up; you should contact whoever owns the source IPs and ask them what they're doing. -- -Chuck