-----Original Message-----
From: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Wednesday, June 03, 1998 7:05 PM
Subject: Re: Changing Networks, have questions...
>Well, I have to have the second card for the other Network, don't I? Or,
>is there a way to route all the traffic for the new network through
>the old network?? I have 2 different routers going, one for each
>network.
Don't confuse a logical network (the set of computers that can "see" each
other because they're on the same subnet) with a physical network (the set
of computers that are connected to the same physical bunch of wiring and
hubs.)
If you hook your two routers up to the same physical network, and give them
each a second alias IP address in each other's networks, and do the same for
your Linux box, then everybody can speak to everybody else.
Now, in the case where a computer in logical network A wishes to speak to a
computer in logical network B, it'll have to use a router still. But the
traffic can all go over the same physical network.
During the period of time where you have computers in network A talking to
computers in network B, you'll have increased network traffic. Also, one or
both of the routers will have to know where to route stuff. This will
probably work itself out, however, unless you've done some major
configuration surgery on those routers and turned off all routing protocols.
Assuming your computers don't talk to each other, the only issue is the
Linux box. And since you'll be putting it in both networks, you won't be
adding any traffic with it because the routers don't have to intervene.
This is the same procedure as if you were setting up virtual web hosts on
your Linux box, with seperate IP addresses for each but the same NIC. The
only difference is, the secondary address is in a different subnet, so
there's two sets of routing information on the Linux box. Assuming IP
Forwarding is turned on in your kernel, it'll all work.
I haven't done this with Linux, but I've done it with routers and I've done
it with BSD/OS boxes. It works just fine. I'm told it works in Linux, and
all the tools are there, so barring a bug in your particular software mix it
should work.
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