Michael Buesch wrote:
On Monday 22 March 2010 22:56:44 Larry Finger wrote:Does anyone have any suggestions on what characteristic could be used to generate a unique MAC address for a box in a udev rule?/dev/urandom Yeah, there's the chance of clashes. In practice there won't be any clashes, however. If you think there's a real risk, you should start playing the lottery tomorrow. You'll immediately win a million dollars so you don't have to worry about those questions anymore. ;) In fact, I think the risk for mac clashes is not really reduced by generating the mac address from serial numbers, whatever, etc...
DEC used the L3 address to encode a new MAC at the time the [L3] address was set (DECnet v4). The advantage was they didn't need to use the equivalent of ARP. Of course this is a violation of strict layer separation. Octet1-Octet3 - Broadcom assigned MAC IDs. I found the following: 00-05-B5 00-10-18 00-1B-E9 18-C0-86 Octet4-octet6 - Lowest three octets of the unixtime. Advantages: for the local area network all TZ settings should be the same,so the MAC addresses *will* be different. Beyond the first router that won't
matter. Also for the same machine different interfaces are GUARANTEED to have different MAC addresses. For two machines to have the same MAC they would have to be booted at(same time x processing factor) such that the B43 initialization will result
in the same MAC address. I'd like to think those odds are even lower than your lottery.A million dollars? http://www.active-domain.com/resources/million-dollar-domains.htm
Yeah got the t-shirt. E
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