From owner-freebsd-questions@FreeBSD.ORG Mon Mar 23 19:41:57 2009 Return-Path: Delivered-To: FreeBSD-Questions@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BF00B106566C for ; Mon, 23 Mar 2009 19:41:57 +0000 (UTC) (envelope-from jalmberg@identry.com) Received: from mx1.identry.com (on.identry.com [66.111.0.194]) by mx1.freebsd.org (Postfix) with ESMTP id 56B848FC13 for ; Mon, 23 Mar 2009 19:41:57 +0000 (UTC) (envelope-from jalmberg@identry.com) Received: (qmail 96290 invoked by uid 89); 23 Mar 2009 19:42:18 -0000 Received: from unknown (HELO ?192.168.1.110?) (jalmberg@75.127.142.66) by mx1.identry.com with ESMTPA; 23 Mar 2009 19:42:18 -0000 Mime-Version: 1.0 (Apple Message framework v753.1) In-Reply-To: <20090323191917.GA46373@Grumpy.DynDNS.org> References: <20090323191917.GA46373@Grumpy.DynDNS.org> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <192DFF2A-632D-4DA8-9108-919DAE6872EB@identry.com> Content-Transfer-Encoding: 7bit From: John Almberg Date: Mon, 23 Mar 2009 15:41:55 -0400 To: FreeBSD-Questions@FreeBSD.org X-Mailer: Apple Mail (2.753.1) Cc: Subject: Re: utility that scans lan for client? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Mar 2009 19:41:58 -0000 On Mar 23, 2009, at 3:19 PM, David Kelly wrote: > On Mon, Mar 23, 2009 at 02:59:36PM -0400, John Almberg wrote: >> I've tried googling for this, but I guess I don't know the name of a >> utility such as this... >> >> What I'm looking for is a utility that can scan a LAN for attached >> clients... i.e., computers that are attached to the LAN. >> >> I have one box (an appliance that I have no access to), that is on >> the LAN but I don't know what IP address it's using. I'd like to >> complete my network map, and that is the one empty box on my chart. > > How about something as simple as "arp -a"? This lists the arp cache of > machines recently heard by your machine. If you know the IP address of > the machine in question and its not in your arp table, ping it. > Then the > MAC address will appear unless there is a router between here and > there. > > No need to be root. H'mmm. This is also very interesting. nmap did not find this appliance, as it turns out. But arp -a did found something on 192.168.1.107 (see below) server1 (192.168.1.106) at 0:13:d4:45:45:31 on en1 [ethernet] server2 (192.168.1.107) at (incomplete) on en1 [ethernet] server3 (192.168.1.108) at 0:23:12:f8:5e:fd on en1 [ethernet] I'm guessing this appliance (a Vonage phone adapter) is doing something non-standard. -- John