Just in case you haven't determined the supposed manufacturer of the mac address - use this source: http://standards.ieee.org/regauth/oui/index.shtml
Please post the outcome of this trouble. It is an interesting one. > -----Original Message----- > From: Firesox [mailto:[EMAIL PROTECTED] > Sent: Tuesday, August 12, 2003 7:50 AM > To: [EMAIL PROTECTED] > Subject: Re: 3500XL - duplicate IP and Windows NT/2000 server > [7:73868] > > > The log on NT says > > Duplicate IP found with the mac address xx.xx.xx.xx.xx.xx > > All NT servers say the same thing with same exact mac addrss, > but I cannot > find the mac address at all. > > The log on the switches show nothing interesting. > > > > Thanks > > wrote in message > news:[EMAIL PROTECTED] > > Searching CCO, connot find a thing. Do you have logging > enabled, if yes > what > > do the switches say? Try a protocol sniffer(receive span a > problem server > > port), sometimes it is nice to see ip handle things. And > learn a lot... > > > > What did the NT system log say? > > > > Tried newer IOS? (long shot....) > > > > Martijn > > > > -----Oorspronkelijk bericht----- > > Van: Firesox [mailto:[EMAIL PROTECTED] > > Verzonden: maandag 11 augustus 2003 14:19 > > Aan: [EMAIL PROTECTED] > > Onderwerp: 3500XL - duplicate IP and Windows NT/2000 server > [7:73868] > > > > > > I have a bunch of 3500XL switches thruout my customer's lan. > > They are having a problem with unknown mac keep appearing > and disappearing > > from the network. > > > > I can trace the mac-address of the unknown station by "show > mac" from the > > swtich CLI. > > What's strange is that it appears at one switch, but a > minute later it > > appears in the different switch. > > > > what's even more strange is that all NT/2000 servers log > shows there is an > > IP conflict with this mac address. > > Of course, the servers IP function stops due to this > duplicate IP, but > comes > > back in a few minutes. > > All the servers report the duplicate IP comes from the same > mac address. > > > > Has anyone seen this problem? > > > > Thanks > > **Please support GroupStudy by purchasing from the GroupStudy Store: > > http://shop.groupstudy.com > > FAQ, list archives, and subscription info: > > http://www.groupstudy.com/list/cisco.html > > **Please support GroupStudy by purchasing from the GroupStudy Store: > > http://shop.groupstudy.com > > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > **Please support GroupStudy by purchasing from the GroupStudy Store: > http://shop.groupstudy.com > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html **Please support GroupStudy by purchasing from the GroupStudy Store: http://shop.groupstudy.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=73960&t=73868 -------------------------------------------------- **Please support GroupStudy by purchasing from the GroupStudy Store: http://shop.groupstudy.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
