I want to connect two remote locations having same network ID?

Question

I have two remote locations with different network ID. I want to give them same ID. Currently I am using Lease line configured in router at both end and networks are 192.168.1.0/24 & 192.168.2.0/24. Dist between two sides is 30 kms. I wants to use 192.168.1.0/20. Is that possible to connect them with same ID? anybody tell me is VSLM is usefull and how to use it ?

Answer 1

No, you can't route between networks with the same network ID -- or between networks with overlapping IP space.

You can bridge locations with the same IP space but that's not very efficient as all traffic including broadcasts would pass through the bridge. There's never a good reason to do that unless you are using a non-routable protocol such as Netbios or NetBEUI.

192.168.1.0/20 would overlap both 192.168.1.0/24 and 192.168.2.0/24. 192.168.1.0/20 isn't a network ID -- it's an IP address on the 192.168.0.0/20 network which contains hosts from 192.168.0.1 - 192.168.15.254.

VLSM is very handy as it allows you to break down classful networks into smaller chunks and more effectively use available IP space. For example, if you have one class C to work with and need 8 subnets with 30 hosts each, 27 bits of subnet mask (255.255.255.224) will allow you to do that.