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On Sun, 17 Nov 2002 14:31:00 -0500, Michael H. Warfield wrote:

> On Sun, Nov 17, 2002 at 06:03:37PM +0100, Michael Schwendt wrote:
> > On 17 Nov 2002 07:44:38 -0500, Doug Potter wrote:
> 
> > > Actually that is a class B address.
> > > 
> > > The first octet of a class A is 1-126 (127 reserved for loop back)
> > >                      class B is 128-191
> > >                class C is 192-223
> 
> > > since 172 is between the ranges of 128-191 that would make it
> > > class B
> 
> > > Class B subnet 255.255.0.0 or /16
> 
> > The step from Class B to /16 is beyond me. If memory serves
> > correctly, the Class B subnet in RFC1918 is 172.16.0.0/12
> > which would be netmask 255.240.0.0.
> 
>       No no no...  This is totally wrong.
> 
>       RFC 1918 has nothing to do with the old and deprecated classful
> address system.  172.16.0.0/12 is one of the ranges (that happens to
> be in the old Class B address space) for private addresses.

Unfortunately, you've completely misunderstood my comment in your
2nd (longer) reply. I got the merging of the 16 subnets wrong
resulting in a bad combined netmask for all private subnets in Class
B.  Such multi-tasking mistakes can happen, and in this thread I've
never intended to replace networking literature.

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