2 routers with seprate ips (revised)?

Question

Here is my setup.

I have a cable modem with a built in router (router 1). Routers 1's settings doesn't offer much in customization like changing the mac address to get a new ip.

I have another router (router 2) that does allow you to change the mac address. i allready hooked it up to router 1 successfully and now have to seprate wifi connections with the same ip.

my question is not whether or not i can change the mac address to get a new ip. My question is if i change the mac address on router 2 will it also assign the new ip to router 1 as well?

I use to do this frequently in the past when my router was seprate from modem simply by changing the last letter/number in the mac address. I would always google my ip before making the change and always ended up with a diffrent visible ip afterwards.

Answer 1

Not likely.



MAC address of the first router is the one pulling the IP from DHCP server at your ISP. This first router is also a firewall. Whatever you do on the INSIDE port of this firewall is not visible from the EXTERNAL side. So your ISP's DHCP server won't know to give you a new address.



You could simply leave your cable model powered off for a while. By doing so, your ISP will assign the IP you had to someone else. Then you could reconnect to get fresh IP. How long you must stay disconnected varies from few minutes to a day or so. The lease will expire eventually, then the address will be made available to someone else.

Answer 2

No, it will not. Your question would be easier to answer if you could explain what you are attempting to do. If you want to change your external IP address, rebooting the cable modem will do that. If you want internal machines to obtain different addresses, you can do that, but it would serve no relevant purpose I can imagine. If you want to LOOK like you are coming from multiple different IP addresses for an external user, you need to proxy your connections and choose a new proxy for each IP address change. TOR is a good encrypted proxy system for something like that, although I would not count on it for illegal activities as the NSA funds it.

Answer 3

tkquestion is correct.

Though you could try calling your ISP and requesting a DHCP renewal, if possible.

For some ISP's I'm able to do this, others not.