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New Member

Combining subnets

Good Morning.

I've got a question on how to combine subnets. I have 3 small closed networks, all utilzing a ip range of 192.168.1.xxx

These networks have no "outside" connectivity to the world and are located in 3 seperate physical locations.

To allow me to manage the applications and such that run on these networks, I am going to bring dedicated connections into a single location so that I can access these networks remotely.

Currently, I have a Point to point T1 connecting me to one network and I utilize Cisco 1841's on either end of that. However, I will pull fiber for connectivity to the other two nets. Both buildings are withing 500 feet of me.

What I want is to have all 3 networks have a Cicso router at the "network" end and a single router in my lan room that connects to all 3. Then, I want to be able to have one or more PC's to be able to connect to any of the 3 networks as needed.

Any thoughts as to the best method to implement this? I think the router side is pretty straight forward, but the PC connectivity is stumping me for the moment.

Thanks

Bob

3 REPLIES
Cisco Employee

Re: Combining subnets

you should go the routing/swtiching or WAN forum for such question.

Gilles.

Cisco Employee

Re: Combining subnets

Hi Bob,

Would it be fair to say that you have one 192.168.1.0/24 subnet and you need to divide it into three such that they all in the 192.168.1.0.24 range but connected via routers?

say :

subnet 1------ router-------subnet 2

subnet 3--------|

If my understanding is correct then you can use the following subnets :

Subnet 1 : 192.168.1.0/26 (192.168.1.0 255.255.255.192

Subnet 2 : 192.168.1.64/26 (192.168.1.64 255.255.255.192

Subnet 3 : 192.168.1.128/26 (192.168.1.128 255.255.255.192

HTH,

Please rate if it helps,

Regards,

Kamal

New Member

Re: Combining subnets

No. I have 3 distinct, geographiclly seprated closed networks, Each network was built with 192.168.1.XXX subnet. When originally designed, the 3 networks were to never connect to anything.

However, I now need to manage these networks remotely. Thus, I will be bringing a connection from each network into my workspace. Several of my staff need to be able to connect to any machine on these networks. The 3 still have to be "seperate", to ensure that no activity on one network crosses into the other.

So, from my terminal at my desk, when I bring up my remote desktop software, I need to be able to go to any machine on either net.

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