>On Mon, 14 Apr 1997, Robert Hayne wrote:
>
>> 1.2.3.1 to 1.2.3.63 1st subnet
>>
>> 1.2.3.64 to 1.2.3.127 2nd subnet
>>
>> 1.2.3.128 to 1.2.3.191 3rd subnet
>>
>> 1.2.3.192 to 1.2.3.255 4th subnet
>
>Depending on who you ask, this arrangement is invalid. The first and last
>subnets are unusable. I'm not sure whether the PM2E supports this
>arrangement or not (MegaZone?).
For Livingston products, the first and last are definitely usable. For
Cisco and most others, the last is usable. For Cisco IOS do an
ip subnet-zero
and the first is also usable.