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Connecting Router To Router

I want to know if when you connect a router to another router, you can have each of the routers have their own IP addresses.
For example:
Router_Main: Connected to modem
Router_Sub: Connected to Router_Main

Router_Main: Has one ip address
Router_Sub: Has another ip address different from Router_Main

Is this possible? It seems that when I try to do it, and I check the ip address (like in whatismyipaddress.com), it is always displays the ip address from the Router_Main)

Miftaul H

Its definitely possible.Whatismyip shows the public ip address nearest to the host before NAT takes over.

If you have multiple blocks of public IP addresses, you can use one block between router_main and Router_sub. Router_sub IP address will be shown in whatismyip result.

Again if you have public ip addresses on your pc, whatismyip will show your PC IP. Its all about how nearest the publicly routable IP address is.

In many of the production network, NAT works at the firewall/router, all the end devices goes to internet NATed. So the whatismyip result shows the WAN ip.

You might be using private rfc1318 range of IP between router_main and router_sub, and NAT is happening at the main router. So the nearest public ip is the main router wan interface thats shown in whatismyip result.

PachecoPrimo

ASKER

Hi Miftaul,
So how do I go about setting so that way it reads the IP address separately? You mentioned 'rfc1318' range, does this value need to be changed in the Main_Router, and if so to what value?
Thanks

ASKER CERTIFIED SOLUTION

tmoore1962

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