Date: 15 Aug 2002 09:27:56 -0500 From: Kirk Strauser <kirk@strauser.com> To: freebsd-questions@freebsd.org Subject: Re: tool to derive ip from mac address of a remote box? Message-ID: <87d6skkxhv.fsf@pooh.int> In-Reply-To: <200208142056.45333.mark.rowlands@minmail.net> References: <200208142056.45333.mark.rowlands@minmail.net>
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At 2002-08-14T18:56:45Z, Mark Rowlands <mark.rowlands@minmail.net> writes: > I know this is not strictly freebsd related but ......there is a dodgy > network card somewhere on my network pumping 1.5mb/s of crap..... All I > have is a mac address, how can I get an ip for it? On a related note, you can find out who made that NIC by searching: http://standards.ieee.org/regauth/oui/index.shtml For example, one of my adapters has this MAC address: "00:D0:B7:9E:BB:DD". If you go to that web page and enter the first three octets without the colons ("00D0B7"), you get: 00-D0-B7 (hex) INTEL CORPORATION 00D0B7 (base 16) INTEL CORPORATION 5200 NE ELAM YOUNG PARKWAY HF1-08 HILLSBORO OR 97124 UNITED STATES This can be *very* handy for tracking down rogue hardware. I was getting bizarre results from a server once; it was always pingable, but only accessible about 50% percent of the time. I finally noticed that the IP's MAC was flapping between two values, discovered that one of the OUIs belonged to Cisco, walked over to a little managed switch and cut the power, and promptly saw the problem disappear. OUI Is Your Friend. -- Kirk Strauser The Strauser Group - http://www.strausergroup.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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