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

[rescue at sunhelp.org]

Every single thing I have read, from TCP/IP illustrated, to various
technical manuals and the relevant RFC's defines IP classes based on the
values of the significant bits.  The rest of the silliness about /x
notation, x.x.x.x netmask notation, block ranges, etc seems to have been
fallout of the inferrences created by saying, for example, "class C will
have 110 as the values for the most significant bits".  From there, you
may infer the other bits(:P)and pieces.  But a definition an inference
does not make.  

===============================
Ed Mitchell (ed<-at->the7thbeer.com)
Finger for PGP public key
===============================
This boxen's uptime stats....
 12:15pm  up 5 day(s), 19:35,  2 users,  load average: 0.01, 0.00, 0.01


On Tue, 8 May 2001, Magnus Hultin wrote:

> 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
> 
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