RE: [FW1] Netmasks on different NIC's

["Van Schijndel, Art - TOH" <avanschijndel@bpa.gov>]

I've seen bizarre things in RIP environments where VLSM is used.  Since RIP1
broadcasts don't include subnet masks, you can end up with some major
confusion.

Art

-----Original Message-----
From: Carric Dooley [mailto:carric@com2usa.com]
Sent: Monday, October 04, 1999 10:24
To: Earl Robinson
Cc: fw-1-mailinglist@lists.us.checkpoint.com
Subject: Re: [FW1] Netmasks on different NIC's



I think it has someting to do with the fact that 192.168.x.x is NOT a
class B network.  It is in the Class C range.  If you are going to bring
class
into it, us a class B. I have seen routers do bizarre things when you go
against the natural mask.  The only protocol that supports supernetting
(for route aggregation) is BGP.

On Mon, 4 Oct 1999, Earl Robinson wrote:

> 
> This looks exactly right to me. I'm not clear on why Carrick Dooley says
you cant
> use 192.168.xxx.xxx as a class B network. But anyway....
> 
> What is your vendor's explanation of why this won't work?? Not enough $$$
in it for
> them or what?
> -earl
> 
> "Van Schijndel, Art - TOH" wrote:
> 
> > Bjornar,
> >
> > I do variable length subnetting on my firewalls with no problem.  Your
> > subnet boundaries look a little funny to me, however.  Bounce this off
your
> > vendor:
> >
> > > NIC1: xxx.xxx.xxx.33-64 mask 255.255.255.224 (32 addresses)
> > NIC1: xxx.xxx.xxx.32-63 mask 255.255.255.224 (30 usable addresses)
> >
> > > NIC2: xxx.xxx.xxx.65-96 mask 255.255.255.224 (32 addresses)
> > NIC2: xxx.xxx.xxx.64-95 mask 255.255.255.224 (30 usable addresses)
> >
> > > NIC3: xxx.xxx.xxx.97-104 mask 255.255.255.248 (8 addresses)
> > NIC3: xxx.xxx.xxx.128-135 mask 255.255.255.248 (6 usable addresses)
> >
> > > NIC4: xxx.xxx.xxx.105-112 mask 255.255.255.248 (8 addresses)
> > NIC4: xxx.xxx.xxx.136-143 mask 255.255.255.248 (6 usable addresses)
> >
> > > NIC5: xxx.xxx.xxx.113-144 mask 255.255.255.224 (32 addresses)
> > NIC5: xxx.xxx.xxx.96-127 mask 255.255.255.224 (30 usable addresses)
> >
> > Best regards,
> >
> > Art
> 
> 
> 
>
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