Did you change your IP at any time? If so, your ARP cache could have a record of the old address for a little bit, and the new one would have the same MAC, and that would be your duplicate. Thats all I could think of as far as the duplicate MACs go.
Jon On Thu, 18 Mar 2004 21:43:33 +0100 Sigfred H�versen <[EMAIL PROTECTED]> wrote: > On Thursday 18 March 2004 21.28, Kirk Ismay wrote: > > Slightly off topic, but has anyone ever seen 2 separate systems with > > the same MAC address? I thought this was a "never supposed to > > happen" kind of thing as MAC's are supposed to be globally unique. > > However, I've had this happen twice now with clients on my ADSL > > network (I use an OpenBSD/PF box as a router/dhcp server). > > > > In the first case, it was an onboard AOpen NIC on the motherboard, > > this time it seems to be an SIS nic. (Judging by the vendor prefix). > > > > NICs are usually in Windoze systems, so I'm not sure if I can use > > software to set the MAC. And if I could, is there a 'private' range > > for MACs that could be used if I did set it to something else? That > > way I don't accidentally give them another mac that might be > > duplicated. > > In some BIOSes there are options for setting the MAC address for > onboard LAN. If you have access to the PC's, that is. > > /Sigfred >
