Date: Mon, 23 Mar 2009 15:41:55 -0400 From: John Almberg <jalmberg@identry.com> To: FreeBSD-Questions@FreeBSD.org Subject: Re: utility that scans lan for client? Message-ID: <192DFF2A-632D-4DA8-9108-919DAE6872EB@identry.com> In-Reply-To: <20090323191917.GA46373@Grumpy.DynDNS.org> References: <E4A3989A-982F-4B9D-971D-25C49A932EB7@identry.com> <20090323191917.GA46373@Grumpy.DynDNS.org>
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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
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