>    Stefan Jeglinski, <[EMAIL PROTECTED]> wrote:
>
>>There doesn't appear to be any way to use the IP/n notation to
>>describe certain small blocks of IPs.

Thanks Dmitry for the discussion :-) it prompted me to do what I 
should have done to begin with... learn the durn system!

The answer to my original question is that the IP/n notation can be 
used all the way down to the level of describing two adjacent Class C 
IPs. Of course at this point, it is sixes whether to just make 2 
separate entries. In addition, there is a logical decimation of the 
addresses as one gets to finer and finer detail. Therefore, although 
an arbitrary block cannot necessarily be covered by a single IP/n, it 
is generally possible to create several IP/n notations to cover an 
arbitrary block, down to the minimum (maximum?) granularity of 2 IPs.

The IP/n notation is obviously intimately connected (or equivalent) 
to the details of subnetting. As good a reference as any for Class C 
subnetting is at

<http://www.linuxgazette.com/issue36/tag/a.html> (scroll down)

Similar principles apply for subnetting class B or A blocks.

In addition, Joe Laffey's Whatmask at 
<http://www.laffeycomputer.com/software.html> is an invaluable tool.


Stefan Jeglinski


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