On Thu, May 11, 2023 09:57, Mark Ranft wrote:
> Hi James,
>
> NMMGR and the HP3000 is correct 192.168.0.x is a class C network subnet.  I
> copied the below information from a internet search.
>
> Address ranges to be use by private networks are:
> Class A: 10.0. 0.0 to 10.255. 255.255.
> Class B: 172.16. 0.0 to 172.31. 255.255.
> Class C: 192.168. 0.0 to 192.168. 255.255  <-- This is class C by name, but it
> has a 255.255.0.0 range.  Weird!
>

The C class determination for 192.168.0.0/16 was a curiosity and I appreciate
the clarification.  I checked the RFC and found this:

RFC 1918        Address Allocation for Private Internets   February 1996


3. Private Address Space

   The Internet Assigned Numbers Authority (IANA) has reserved the
   following three blocks of the IP address space for private internets:

     10.0.0.0        -   10.255.255.255  (10/8 prefix)
     172.16.0.0      -   172.31.255.255  (172.16/12 prefix)
     192.168.0.0     -   192.168.255.255 (192.168/16 prefix)

   We will refer to the first block as "24-bit block", the second as
   "20-bit block", and to the third as "16-bit" block. Note that (in
   pre-CIDR notation) the first block is nothing but a single class A
   network number, while the second block is a set of 16 contiguous
   class B network numbers, and third block is a set of 256 contiguous
   class C network numbers.

The problem remains that while NMMGR will validate 192.168.216.1 as a gateway
it will not validate 192.168.0.1 despite the IP net-mask being 255.255.0.0.

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James B. Byrne                mailto:[log in to unmask]
Harte & Lyne Limited          http://www.harte-lyne.ca
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Hamilton, Ontario             fax: +1 905 561 0757
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