Hi Steve,
Stefan Funk wrote:
Now the question:
Is there a problem with my definitions, to have a class B address with a
class A subnet mask?
Referring to classes of address (A,B,C etc.) is now only done
historically. With classless routing (see RFC1519), the class a network
falls into doesn't matter much any more. Technically there is no
problem with specifing a netmask of 255.0.0.0 on 172.0.0.0.
However, there is a problem with your definition if you are trying to
identify RFC1918 private, non-routeable address space (the definition
172.0.0.0/8 is too broad). You should use a 172.16.0.0/12 (netmask
255.240.0.0) to define that rule.
Elliot
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