[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Fwd: ARP problems in -testing?
There are four types of MAC addresses: Globally Unique *0-**-**-**-**-** *4-**-**-**-**-** *8-**-**-**-**-** *C-**-**-**-**-** Locally Administered *2-**-**-**-**-** *6-**-**-**-**-** *A-**-**-**-**-** *E-**-**-**-**-** Multicast *1-**-**-**-**-** *3-**-**-**-**-** *5-**-**-**-**-** *7-**-**-**-**-** *9-**-**-**-**-** *B-**-**-**-**-** *D-**-**-**-**-** *F-**-**-**-**-** Broadcast FF-FF-FF-FF-FF-FF (Could be considered an all-stations multicast) Locally administered addresses can be considered private ethernet: (LAA) are MAC addresses which have the second least significant bit (LSB) of the first octect is set to '1' (for example, 'xxxxxx1x'. LAA enable administrators to assign MAC addresses using their own scheme. When an LAA is assigned, it overrides the in-memory copy of the Global address during driver initialization. So the burned-in address on the Ethernet adapter is never actually changed, only the in-memory copy. LAA create the possibility of assigning duplicate MAC addresses, which makes for some very interesting network problems. Fortunately, they are rarely used in Ethernet environments, but are fairly popular in Token Ring networks. The Xen addresses are in the LAA range, so scheme wise you are safe to do whatever you want with them. Alternatively XenSource could spring for an OUI or IAB, not really that expensive: The OUI is $1,650.00 (US); the IAB is $550.00 (US) IAB = Individual Address Block, 12 bits of address space instead of 24. Tim:> ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/xen-devel
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