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Internal Routing with two buildings

Morning All,

We have two buildings in close proximity to eachother, that are currently connected by fibre.

We are experiencing an issue with network capacity at the moment, the organisation is using a class C address range the the vast majority of network devices, and we are now running out of IP addresses.

The ideal situation would be to move over to a class B address range, which we can subnet for various departments/services.

My networking a little rusty...but I'm thinking in order to accomplish this, we would need two routers, one for each building, connected together. That way they can route internally to various subnets to either building. Is this correct? Someone has mentioned to me that I would only need one router, but I'm not too sure on how that would work...
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David_4321
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David_4321
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CCI_ITCommented:
You only need 1 router and dont need to get a class B address unless each subnet you were going to create was too large for a calss C address). You have 1 router (at either location) and each subnet's default gateway should be its respective interface on the router.
 
For example.
 
Subnet a = 192.168.1.0 255.255.255.0 dg=192.168.1.1
Subnet B = 192.168.2.0 255.255.255.0 dg= 192.168.2.1
Router interface a = 192.168.1.1 255.255.255.0
router interface b = 192.168.2.1 255.255.255.0
The router will be able to route traffice from subnet a to b since both networks are on the same device and the router knows about them both. More config will be needed for internet connections etc.
 
 
If you have 2 routers, you will need to have a routing protocol (rip, ospf etc) or use static routes so that router a knows about the networks on router b and vice versa.
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David_4321Author Commented:
I assume If i have different subnets in different buildings I would need two routers anyway? To serve its own subnets and to know when to forward packets to the other router.
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CCI_ITCommented:
no. 1 router. That one router will br the bridge between the 2 subnets (and however many more you decide to add to it).
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CCI_ITCommented:
The physical location of the router doest matter. Can be in building A or B (or somewhere in between).
Drawing1.jpg
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David_4321Author Commented:
Would it complicate matters if each building had its own Internet connection?
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CCI_ITCommented:
If each building had its own internet connection then you would need 2 routers.
Drawing1.jpg
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David_4321Author Commented:
Exactly what I was after, thanks
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