multiple network interfaces questions, RHEL 3 new install

[Bob McClure Jr]

On Fri, Jan 21, 2005 at 08:00:41PM -0600, Chuck Campbell wrote:
> After googling all afternoon, I begin to understand my earlier misconceptions
> :-)
> 
> On Fri, Jan 21, 2005 at 05:18:22PM -0600, Bob McClure Jr wrote:
> <snip>
> > 
> > > Where can I find info on setting things up this way (or is it impossible) ?
> > > I know that I can bind samba to a particular interface, but how do I control
> > > what interface talks to the local intranet and what interface only talks
> > > to other cluster machines?
> > 
> > Only by subnetting.  The port (Samba, mail, et al.) is irrelevant to
> > the ethernet device.  The network interface card cares only about IP
> > address.
> > 
> > > Will they need to be different sub-nets to make this work?
> > 
> > Yes, if you don't want to mix differing traffic on the same wire.
> 
> That's the goal.  The cluster machines should talk to each other (on their 
> own subnet) through the gigabit layer 3 switch in the machine room.  That 
> should enable isolation from other traffic, right?  
> 
> In addition, I'll bind the second gigabit ethernet card to a different subnet,
> although it will plug into the same layer 3 gigabit switch in the machine room.
> This interface will be used for samba data serving to the local network.
> 
> The layer 3 switch will uplink to the local network layer 3 gigabit switch.
> 
> Does this get me to where I want to be, or am I still disillusioned.
> 
> ASCII drawing follows that shows what I HOPE to accomplish:
> 
> eth1 on cluster machines are subnet 1
> eth2 on cluster mnaster is subnet 2 (local network)
> 
> Cluster master does cluster management and computation
> Cluster slave(s) do computation
> Cluster master does samba serving
> 
> __________                        __________
> |  eth1  |-----|            |-----|  eth1  |
> | cluster|   __|____________|__   | cluster|
> | master |   | layer 3 switch |   | slave  |
> |  eth2  |---|    gigabit     |   |        |
> |________|   |________________|   |________|
>                     |
>              _______|__________
>              | layer 3 switch |
>              |    gigabit     |
>              |________________|
>                     |
>                _____|_________
>                | local net   |
>                |many machines|
>                |_____________|
> 
> 
> I assume I still need to do some routing configuration to make this work?
> 
> thanks,
> -chuck

Level 3 switches are above my level of incompetence, so I'll defer to
the estimable Rick Stevens.

Cheers,
-- 
Bob McClure, Jr.             Bobcat Open Systems, Inc.
robertmcclure at earthlink.net  http://www.bobcatos.com
Wise men still seek Him.