Two NICs - Two Networks - No Clue

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1.two nics - two networks

I have a windows 2003 server with one nic (192.168.100.x).  We just 
purchased a second company that's in our building.  Can I add a second nic 
and configure it to there network ip scheme (192.168.25.x) so that I can 
share one server?  I want to share the server, just not the information on 
the server.  Will either of the networks be able to one another if I don't 
bridge the networks cards?  Thanks for any help you can provide.

A

2.Server 2003 two nics two networks

We have multiple servers (2003) with two NICs.  In each machine, one
NIC is configured with a public IP and one with a 10.x.  Our lab
machines are all on the 10.x network.  The idea is that the lab
machines communicate via the 10.x to our servers.  However, they are
also supposed to be able to connec to the Net.  They go through a
router that has a private and a public interface for this purpuse.
However, I am finding that my servers are getting to portions (if not
all) of my public network via their private interfaces, through this
router, and on.  The effect - my router "poisons" my campus router such
that other computers on my public network cannot see my servers.  I
believe that what happens is that a computer on the public network goes
through our campus router to get to the server's public IP but the
campus router reports the MAC of my private router - it then discards
the traffic.  Anyhow, my assumption was that with any Windows Server
machine with two NICs with two networks would logically say: if this
packet is destined for 10.x go out my NIC with that network address.
If this packet is destined for a public IP go out my NIC with a public
IP address.  Is this logic wrong?  If so, what is the reason?  If my
logic is correct, what would cause my servers to violate this logic?  I
am more than willing to read whatever necessary if someone wants to
simply point me in the right direction.

Thanks

3.Servers with two NICS and two networks

I have 8 servers with 100 desktops attached.  The servers connect to a 1gb 
switch that feeds all the desktops.  There is a firewall attached to the 
switch that provides Internet connection.  All pretty standard stuff = IP is 
10.10.1.0 to 10.10.5.0 with mask of 255.255.252.0.   

I have a tape drive in one server that backs up data from the other servers. 
 Since all the servers have two NICs, I was hoping I could setup a separate 
address range for those NICs and let the backup use that NIC and not flood 
the other with traffic.  

I can set the second NICs to be 172.16.1.1 172.16.1.250 range with mask of 
255.255.255.0.  I would put in a new 1gb switch that just connects the second 
NICs (switch is cheap enough and no need to burden other switch with VLANs).  

What would I need to also configure on the servers so it knows that traffic 
destined for the other servers use the 172.16.x.x range and not the 10.10.x.x 
range?  What other settings do I need to know about?  

Is this config going to make a difference in inter-server communication 
(speed)?

4.Two NICs / Two Networks / One Machine

Here's the situation:  I have both DSL (pokey 800k) and Cable (2500k, usually) broadband modems in my SOHO.  I'd like to have both of these hooked up, not to run in a "Dual WAN" mode, but in an "either/or" mode

Is this possible

5.Two NICs And Two Separate Networks?

Question about a proposed office network.... All Windows XP systems


Network 1:
 Cable Modem ---> Router / Firewall ---> 3Com Hub ---> NIC #1 In
Machine (TCP/IP & DHCP)

Network 2:
 3Com Switch  ---> NIC #2 In Machine (IPX/SPX & Set IP Address)

I was told running a different protocol such as IPX/SPX on the second
network would make it more secure, is this true?

I understand that the PC's still are connected to the internet on
network 1 but wouldn't it be more secure since network 2 isn't
directly connected to the internet and in order to access network 2 a
hacker would have to go through the firewall and then though the
machine?


The server will be on network 2 and will not need internet access. 
One would think that since it is on a separate network it would be
more secure than being connected directly to network #1

Any ideas?

6. Two NICs & Two Separate Networks?

7. Two NICS, Two IP Addresses - ONE SERVER NAME

8. Two nics, two ISP's