1 WAN ways to switch between different routers to change IP address

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QUESTION :

I have 1 ethernet cable from my ISP, when I plug that cable to a different router and the IP address will be changed (IP wont change when I re-plug into the same router). So now I have bought lots of router, in order to change the IP address frequently. The problem is, how can I set it up so that the cable WAN will be connected to “something” and that something will be connected to all routers I bought, so that I can switch (turning on only 1 router at each time) between different routers through, maybe turning off in “somethings” in the router admin page?

2 questions. Do I need “somethings” like bridge/switcher/hub? How do I control which router the WAN to pointing to, by turning off “DHCP” in the router admin page or something else ??

ANSWER :

So now I have bought lots of router, in order to change the IP address
frequently.

Poor approach I’m afraid.

IPs are binding to MAC addresses, as different routers have different MACs you get different addresses. But you dont need to change router to change MAC, many routers can MAC Spoof meaning one router can do the job of your current collection of many.

As a side note, you really shouldnt need to change your WAN IP regularly unless you’re doing something nefarious.

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