OSEC

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Subject: RE: Class A or C??
From: Ronneil Camara (ronneilconeconsulting.com)
Date: Sun Aug 20 2000 - 05:02:03 CDT

> -----Original Message-----
> From: Mail faithinchaos.com [mailto:mailfaithinchaos.com]
> Sent: Sunday, August 20, 2000 11:44 AM
> To: FirewallsLists.GNAC.NET
> Cc: osca003attglobal.net; piranha-2altavista.net
> Subject: RE: Class A or C??
>
>
> A note to Piranha:
>
> Be careful of blast/flame and who you piss off here. Many
> people on this
> list are high level/ranking industry-types. And people are
> only trying to
> help one-another, so lets not get into a pissing contest - as
> we all "pee"
> the same color.
>
> A note to Oscar and anyone else interested:
>
> For the record, based upon Piranha's somewhat messy example
> of subnetting,
> the subnet of 255.255.255.0 is a 24-bit subnet mask (aka
> 255.255.255.0/24).
> The first 24 of the 32 bits of the IP mask being ON, with the
> last 8 (the
> last octet - 8 per octet) being OFF (aka 0).
>
> With Classless InterDomain Routing (CIDR) prevailing, you
> shouldn't find
> mention of Class "X" designations anymore. As the word "classless"
> implies - there are no longer any classes. When you see CIDR
> IP addressing,
> there should be a "/" following the IP address, along with a number
> representing the number of bits to be used in the subnet mask.
>
> example:
>
> 192.168.1.0/24
>
> The above example would designate the 192.168.1 network, with
> a subnet mask
> of 255.255.255.0 (24 bit subnet mask). In this example of
> CIDR, you don't
> need to be concerned about giving a "title" to your network type
> (A,B,C,etc). You only need to know that a 24-bit subnet mask
> allocates your
> network nodes addresses 192.168.1.1 through 192.168.1.254.
>
> I highly recommend that you take a course or pick up a book on TCP/IP.
> Preferably, get yourself a Cisco book - since you are using
> Cisco products.
>
> -----Original Message-----
> Subject: Re: Class A or C??
> > >We are configuring a PIX interface with the following
> Address/Subnet
> >Mask.
> > >They are 10.9.2.3/255.255.255.0
> > >
> > >Would this be Class A address? It is using private address
> space. Would
> >the
> > >subnet mask determine the network class?
> > >
> > >Thank you in advance.
> > >- --
> > >
> > >Oscar Rau
> > >osca003attglobal.net

This site help me a lot with subnetting.

http://www.ralphb.net/IPSubnet/

I hope this can help even a little. :->

Ronneil
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