/31 on 2 interfaces

[Doug Barton]

Unix-Solutions - Steven wrote:
> Hello,
> 
> I have 2 servers with both 2x 'em' interfaces in it.
> I configged a /31 on both interfaces
> em0 in box 1 = 10.0.0.1
> em0 in box 2 = 10.0.0.2

That's not a /31, it's the middle two addresses of a /30 (as the end of your
message correctly surmised). Here is a hint. Because they use binary math,
CIDR blocks always start with an even address, and end with an odd one.

hth,

Doug

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