Using x.x.x.0 and x.x.x.255 host addresses in supernets.

Jon Lewis jlewis at lewis.org
Tue Jan 8 14:50:13 UTC 2008


On Tue, 8 Jan 2008, Joe Provo wrote:

> Yes.  Efficient address utilization is a Good Thing.
>
>> I realize that technically they are valid addresses, but does anyone
>> assign a node or server which is a member of a /22 with a x.x.x.0
>> and x.x.x.255?
>
> Great for router interfaces, loops, etc where you don't care that
> broken or archaic systems cannot reach them, and where the humans
> interacting with them should have no issues.

Until you assign a .255/32 to a router loopback interface and then find 
that you can't get to it because some silly router between you and it 
thinks '.255? that's a broadcast address.'

Been there...had to change the loopback IP.

----------------------------------------------------------------------
  Jon Lewis                   |  I route
  Senior Network Engineer     |  therefore you are
  Atlantic Net                |
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