[SunRescue] Networking details (was Re: OT: Advice on Certification)

[Magnus Hultin]

On Tue, 8 May 2001, Bill Bradford wrote:

> I've *never* seen "Class C" described as ONE SPECIFIC netblock...
> 
> In common usage, everything I've run into - 
> 
> "Class C" = a /24 netblock, 
> 254 usable IP addresses (x.x.x.1 to x.x.x.254, with .0 being the
> network and .255 the broadcast), 255.255.255.0 netmask..

When I studied this about two years ago, my teachers told
the story like this:

A long time ago, when IP numbers were a new thing, you could
be assigned either a class A block, a class B block or a class
C block of numbers.

Class A would be a /8 network block in the range 1.0.0.0 -
126.255.255.255, with 10.x.x.x reserved for private use.

Class B would be a /16 block in the range 128.0.0.0 -
191.255.255.255, with 172.16.0.0 - 172.31.255.255 reserved
for private use.

Class C would be a /24 block in the range 192.0.0.0 -
255.255.255.255 with 192.168.0.0 - 192.168.255.255
reserved.


At least it's consistent with Chalmers' IP block. We've
got 129.16.0.0/16, a full class B.


/Hultin

-- 
 Magnus Hultin
 e5hultin at cd.chalmers.se