Date: Tue, 24 Mar 2009 10:11:37 +0000 From: Bruce Cran <bruce@cran.org.uk> To: perryh@pluto.rain.com Cc: jalmberg@identry.com, freebsd-questions@freebsd.org Subject: Re: utility that scans lan for client? Message-ID: <20090324101137.GB451@muon.cran.org.uk> In-Reply-To: <49c88f26.l1EpVEWeSl4QsOWV%perryh@pluto.rain.com> References: <E4A3989A-982F-4B9D-971D-25C49A932EB7@identry.com> <200903232010.21179.mel.flynn%2Bfbsd.questions@mailing.thruhere.net> <49c88f26.l1EpVEWeSl4QsOWV%perryh@pluto.rain.com>
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On Tue, Mar 24, 2009 at 12:43:34AM -0700, perryh@pluto.rain.com wrote: > Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net> wrote: > > On Monday 23 March 2009 19:59:36 John Almberg wrote: > > > 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. > > > > security/nmap > > > > If the box pings, you can simply scan your LAN like: > > $ nmap -sP 192.168.2.0/24 > > Or, with no ports needed: > > $ ping -n -t 5 -i 10 192.168.200.255 > > Granted you need to know the broadcast address. If you know the > interface name, you can get the broadcast address from ifconfig: That only works if the OS is configured to reply to broadcast ping, which appears to be usually disabled nowadays. At least on FreeBSD 7.1 net.inet.icmp.bmcastecho defaults to 0. -- Bruce Cran
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