<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> James Wilkinson wrote: <blockquote cite="mid20041215133131.GB3568@howells.westexe.demon.co.uk" type="cite"> <pre wrap="">Marvin Dickens wrote: </pre> <blockquote type="cite"> <pre wrap="">MAC addresses contained in the eeproms of network equipment are absolutely unique and singular. There is no possibility of the a MAC address having plurality unless the MAC address in the eeprom contained in the network equipment has been altered by someone with a hex editor and an eeprom burner. Sure, you can alias the MAC address using software, but the MAC address in the eeprom is *never* altered. </pre> </blockquote> <pre wrap=""> This is a lovely theory and generally true. But this is the computer industry. There have been various "budget" </pre> </blockquote> Yes it's truth. I test 20 MBs which had the same model no. All the built in Network card have the same MAC address. These MB was made by a company called kobian (Made in china). When these Card connected to a DHCP server they optain the same IP address on all the PC Tammo <blockquote cite="mid20041215133131.GB3568@howells.westexe.demon.co.uk" type="cite"> <pre wrap="">Ethernet manufacturers that have used the same MAC for an entire production run, to save costs. If they go into the consumer market, there's no problem. In businesses, too, provided they buy their computers individually. But if you buy a multipack of really identical Ethernet cards... I understand that this is a real pain to track down if you haven't seen it before. James. </pre> </blockquote> </body> </html>