Issues encountered with assigning .0 and .255 as usable addresses?

Tore Anderson tore.anderson at
Tue Oct 23 20:00:53 UTC 2012

* Job Snijders

> In the post-classfull routing world .0 and .255 should be normal IP
> addresses. CIDR was only recently defined (somewhere in 1993) so I
> understand it might take companies some time to adjust to this novel
> situation. Ok, enough snarkyness!
> Quite recently a participant of the NLNOG RING had a problem related
> to an .255 IP address. You can read more about it here:

AIUI, that particular problem couldn't be blamed on lack of CIDR support
either, as is (was) a class A address. It would have had
to be or for it to be special in the classful
pre-CIDR world.

That said, it's rather common for people to believe that a /24 anywhere
in the IPv4 address space is a «class C» so I'm not really surprised.

Tore Anderson
Redpill Linpro AS -

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