On Fri, Oct 18, 2002 at 08:48:46AM +0300, Pekka Savola wrote: > > > I'd be really interested to know if anyone has any indicative > > figures on MAC address collision: it is inevitable that somewhere > > out there there are two adaptors with the same MAC address due > > to human frailties, but how many? > > I don't have figures but Francis Dupont reported this happening once to > him.
I believe in some cases some cheap "clone" NICs would be mass-produced with the same MAC address, (the cloner doesn't care to honour the uniqueness) but hopefully this is rare. However, the units may be likely to end up at one site if bulk-bought from a reseller. There are three levels of probability - the random/privacy addresses across all 64 bits, the EUI-64 addresses (where due to vendor MAC prefix pools only the lower 24 bits may change) and manual addresses. > Vendors who ship e.g. 4-port Ethernet adapters (e.g some Sun products) > with the same mac address in each port are problematic of course (and this > isn't the first time -- switches usually don't like it:-). If you connect > two ports to the same segment.. Is that common? Tim -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
