*Hobbit* wrote :
> Subnetting with 255.255.255.128 works fine here. Which RFC says you
> need to use sets of two bits? I looked around a bit and didn't find it --
If you use that mask with a class A or B address, fine. If you use it with
a class C address, the only subnet #s you get are either all-zeroes or all-ones,
and AFAIR both are reserved (all-zeros for the "local" subnet and all-ones for
all subnets.) This, I think, is stated in one of the RFCs on subnetting.
Notwithstanding, some boxes allow use of an all-zeroes subnet.
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From: hobbit @