Maybe a little OT comment mr B.HEIN? Firesox, can also be a server problem, have you checked for rogue dhcp or faulty scopes?
Martijn -----Oorspronkelijk bericht----- Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Verzonden: maandag 11 augustus 2003 20:58 Aan: [EMAIL PROTECTED] Onderwerp: RE: 3500XL - duplicate IP and Windows NT/2000 server [7:73868] I smell scriptkiddie... I'm not sure how a mac could travel from one neighbor table to another though, sounds very strange... when you sho mac addr XXX is the counterfeit MAC always coming in on the same port(s)??????? --Brad "[EMAIL PROTECTED] .com" To: [EMAIL PROTECTED] <m.m.jansen02 cc: Sent by: Subject: RE: 3500XL - duplicate IP and Windows NT/2000 server [7:73868] [EMAIL PROTECTED] .com 08/11/2003 09:56 AM Please respond to "[EMAIL PROTECTED] .com" 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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=73907&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
