Linux source address selection vs. EUI-64

Gert Doering gert at
Sun Nov 14 10:21:04 CET 2010


On Sat, Nov 13, 2010 at 09:35:41PM -0600, Frank Bulk wrote:
> What happens if the software you're running requires a /64 prefix?  

On the wire, there would *be* a /64.

This deployment is just "virtually carve the /64 into smaller chunks so that
customers/server admins asking for addresses for the virtual servers know 
which range to use".

This is not violating any of the established principles ("one /64 on
each LAN!"), it's just easing the housekeeping.

(Furthermore, what sort of software would run on a virtual web server(!) that
cares how big the LAN prefix is?  In this context, you don't run routing
daemons - and normal userland software has no business caring about prefix
size.  Yes, SeND comes to mind, but that doesn't work with statically 
assigned addresses anyway)

Gert Doering
        -- NetMaster
did you enable IPv6 on something today...?

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