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

["chris halverson" <darusint () hotmail com>]

Ok, I had never seen it put in that way before.  I had known about the /32 
bit notation, but I had only seen the /e used as a netmask on the address.  
Whereas /25 would be 255.255.255.128 in decimal notation.  So I had never 
seen it referred to 2**8 - 1 before.

Chris


> From: Justin Pryzby <justinpryzby () users sf net>
> To: chris halverson <darusint () hotmail com>, 
> security-basics () securityfocus com
> Subject: Re: 2NIC's on same network, possible?
> Date: Tue, 29 Jul 2003 10:36:57 -0700
>
> 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
> > >decide which NIC to use for what. What do you mean '192.168.0.6/24'? A
> > >NIC has an address, and that notation represents 2**8 - 1 addresses.
> > >Justin
> > >
> > >On Tue, Jul 29, 2003 at 03:04:04AM +0000, Vineet Mehta wrote:
> > > >
> > > >
> > > > Hi all,
> > > >
> > > > My collegue has a Linux machine which has 2 NIC's on it. What he did 
> was
> > > > assign the IP's 192.168.0.6/24 and 192.168.0.7/24 to the NIC's. And 
> he
> > > > was trying to ping the network but was getting errors (i dont know 
> the
> > > > errors).
> > >
> > 
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