Re: 2NIC's on same network, possible?

a.b.c.d/e is a "new" notation ("CIDR") used to identify a netblock. It identifies a network beginning at a.b.c.d where e bytes are the network portion. There's an RFC that covers this in depth, but the old-style A,B,C networks are /8, /16, /24 respectively. A slight overapproximation of the maximum number of hosts on a /e network is 2**(31-e). An IP address is 32 bits, e of which identify the network. So, 32-e of them identify the host. There are 2**n possible ways to set n bits (and the maximum value of n bits is 2**(n-1)).

Probably the other post was right and your friend has used a netmask appropriate for a /e network.

Justin

On Tue, Jul 29, 2003 at 08:25:03PM +0000, chris halverson wrote:
>
> I am not sure what you are asking when you refer to the 2**8 - 1 addresses.
> Can you clarify?
>
>
>
> >From: Justin Pryzby <justinpryzby@users.sf.net>
> >To: Vineet Mehta <vineet@linux.com.kw>,security-basics@securityfocus.com
> >Subject: Re: 2NIC's on same network, possible?
> >Date: Mon, 28 Jul 2003 17:08:37 -0700
> >
> >That should definitely be possible, though I don't know how it will