LARTC - Jun 2006 - Looking for info

Firstly if this is not list specific then excuse me.
 
I am looking for information on how I might use a Linux box with three
network cards to service two subnets off of a single 10Mg VPN feed.  We have
currently got two 5 offices all connected over a VPN. 2 of the offices are
to merge but for simplicity we don''t want to change all the IP
addresses. We
are moving the two networks xxx.xxx.0.0 and yyy.yyy.0.0 into the same
building with a single 10Mg feed.
 
What I would like to achieve is a single linux box with 3 network cards in,
one on the 10Mg feed (10.0.0.1), one on the xxx.xxx.0.0 network
(xxx.xxx.100.99) and one on the yyy.yyy.0.0 network (yyy.yyy.100.99). 
 
With a completely clean redhat 7 install is this a simple thing to achieve?
What sort of routing tables would I need?
 
Again sorry if this is the wrong place to ask, but if it is, if you could
then point me in the direction of the right place, I would be grateful.
 
Neil.


Mulberry would like to take this opportunity to make you aware of an important
change which will be taking place as of Monday 10th July 2006.

Mulberry''s head office currently at Kilver Court, Shepton Mallet will
be re-locating to the following address:
The Rookery, Chilcompton, Somerset, England, BA3 4EH. 
Main telephone number: 01761 234500. 

Individual contacts should be making you aware of their new phone numbers
shortly.


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Neil Russell wrote:
> I am looking for information on how I might use a Linux box with three 
> network cards to service two subnets off of a single 10Mg VPN feed.  
> We have currently got two 5 offices all connected over a VPN.
Is that 2 or 5? I am assuming it is 5.
> What I would like to achieve is a single linux box with 3 network 
> cards in, one on the 10Mg feed (10.0.0.1), one on the xxx.xxx.0.0 
> network (xxx.xxx.100.99) and one on the yyy.yyy.0.0 network 
> (yyy.yyy.100.99).
>  
> With a completely clean redhat 7 install is this a simple thing to 
> achieve? What sort of routing tables would I need?
>   
I may be misunderstanding the simplicity of your problem, but since you 
have 3 directly connected networks, as long as routing is enabled on the 
Red Hat box, the machine should route packets correctly. If not, you can 
add static routes. Something like this should be a sufficient resource: 
http://www.siliconvalleyccie.com/linux-hn/network-linux.htm

If the problem is more complex than I have assumed, let me know.
Devanshu