Adding a 2nd NIC

I added a second gateway (ADSL link) on site, then added a second NIC in the W2003 srv. But I can't get the server to manage the 2 different gateway.

The problem is that they both are on the same subnet:

NIC1 192.168.2.4
GW1 192.168.2.1
NS1 192.168.2.1

NIC2 192.168.2.6
GW2 192.168.2.2
NS2 192.168.2.2

The 192.168.2.1 & 192.168.2.2 are the firewall interface before the 2 ADSL links

Q: How can I configure NIC2 to enable the server to be reached from both ?

Here is a schematic:

Internet
|
|
|ADSL 1 (Static)
|Router 1 (Static)
|Firewall 1 (Static)
|
|Web Server (win 2003) - NIC 1
| Facing FW Interface 1
|IP: 192.168.2.4
|SN: 255.255.255.0
|GW: 192.168.2.1

Internet
|
|
|ADSL 2 (Static)
|Router 2 (Static)
|Firewall 2(Static)
|
|Web Server (win 2003) - NIC 2
| Facing FW Interface 1
|IP: 192.168.2.6
|SN: 255.255.255.0
|GW: 192.168.2.2


Thanks !

 

You can't. Routing tables working as a list of individual routes. When a system needs to pick a route, it works its way through the routing table until it finds a route that works. So you can have two routes to the internet set in your routing table, but only the top one will be used because that is the one the system comes to first.

You needs a load balancing application or appliance to manage the two connections. You cannot just add two routers and expect TCP/IP to balance the load over the two. It's not how it is designed to work. TCP/IP will always look for a single route.

 

So If I configure the ANS application of the 2 Intel NIC on the server, to be teamed, would that work ?

 

Reggie,

and what about if I use two different subnet / IP like this:

NIC1 192.168.2.4
GW1 192.168.2.1
NS1 192.168.2.1

NIC2 172.15.15.4
GW2 172.15.15.1
NS2 172.15.15.1

What I need is for this server to answer on two different IP
and reply within two different gateways.

 

No. Either:

GW1 192.168.2.1

or

GW2 172.15.15.1

would be higher in your routing table and that one would get all your outgoing traffic.

Teaming would balance the out going traffic, but the returning traffic could be very odd. You could try it, but I doubt it will work.

When I said "You need a load balancing application or appliance to manage the two connections" what I meant was : You need a load balancing application or appliance to manage the two connections.

Have a look at this for example:

http://www.xrio.com/Home.aspx

Top hit when I googled "ADSL load balance ".