[c-nsp] VLSM

Brant I. Stevens branto at branto.com
Tue Jan 11 12:45:32 EST 2005


Though technically being allocated an address block of 200.100.0.0/16
provides you the same number of addresses, as say being allocated
4.100.0.0/16, or 150.100.0.0/16; this is true (256^2) .  But in the old
classful sense, they are NOT the same.  Especially if you are unfortunate
enough to still have to deal with RIPv1, or you are performing auto-summary.

Class B Space falls in the range between 128.0.0.0 and 191.255.255.255.  If
it falls out if that range, then it is not a "Class B", though it may be an
allocation of /16. 

It does still matter, if even only in very specific cases.  That's the point
I was trying to make.


On 01/11/2005 12:11 PM, "Hudson Delbert J Contr 61 CS/SCBN"
<Delbert.Hudson at LOSANGELES.AF.MIL> wrote:

> i know that the education of network guyz is outdated but some of the thingz
> being stated hear are knee jerk bandwagon jump-on..
> 
> 
> since when is a /16 size chunk of addresses not a class 'b' space.
> 
> i think what manner in which the size of a space is called as long as one
> understands
> what it speak of. much ado about nothing methinks.
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net]On Behalf Of lists at hojmark.org
> Sent: Monday, January 10, 2005 3:59 PM
> To: 'matthew zeier'; 'Gert Doering'; 'Shaun'
> Cc: cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] VLSM
> 
> 
>> However, I can't get people (sales) to stop calling it "class c".
> 
> Even worse is when they (and some 'techs') call everything /24 a "class C"
> and a every /16 a "class B", even when it's 10.10.10/24 and 10.10/16, for
> example.
> 
> Yuck.
> 
> -A
> 
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