On Mon, jan 03, 2011 at 07:05:24, Mikael Abrahamsson wrote: > Subject: Re: The tale of a single MAC > > On Mon, 3 Jan 2011, Dobbins, Roland wrote: > > > I remember that there were several high-profile instances of > duplicate > > MAC addresses being burnt into NICs during the 1990s - once every > > 2-3 years, IIRC. And those were just the ones that were discussed > publicly. > > D-Link shipped NAT-boxes around 2003-2004 or so with identical MAC > addresses (and a "clone your PC mac address to the WAN interface"- > functionality). I checked my then employer ADSL network and 5% of the > customer ports had the same MAC address, D-Link support alledgedly > said something about the MAC address not being "unique enough" and > directed their customers to the cloning functionality to "solve" the problem. > > -- > Mikael Abrahamsson email: swm...@swm.pp.se
Years ago D-link and Linksys and maybe other vendors used the source MAC of 00:00:00:00:00:00 which isn't very nice and could cause interesting issues. At my current job we used to have a routine to find these MACs and tell the users to change to a valid address.