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

  • From: Jon Lewis
  • Date: Tue Jan 08 10:27:43 2008

On Tue, 8 Jan 2008, Joe Provo wrote:

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.'


See the qualifier "where you don't care that broken or archaic systems
cannot reach them". If you have brokenness on your internal systems
then yes, you'd be shooting yourself in the foot.

Until you shoot yourself in the foot, how would you know you have such brokenness on your internal systems? That silly router happened to be a 7206 running (IIRC) 12.1T code.

Unless you really don't care about the brokenness, or really want to root it all out, I'd avoid using .0 and .255 IPs.

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