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donawalt's avatar
donawalt
Mentor - Experienced User
Oct 17, 2021
Solved

Simple question on CM1200

This is a simple question for many I am sure, but I could not find the answer in the CM1200 modem...   That modem has 4 RJ45 ports on it - #1 goes to my router; #2 is preferred for link aggregation...
  • plemans's avatar
    Oct 18, 2021

    Who's your ISP? 

    The majority of the big ISP's only support 1 device connected to a modem. 

    this happens because they only assign 1 public IP address to each modem. Not multiple public IP addresses. 

    So for most users, the extra ports on the CM1200 are useless. 

     

    Sadly Netgear and ISP's do a poor job of explaining modems with mutiple ports. 

     

    there are a few ISP's the support multiple public IP address but they're rare and tend to be smaller ISP's. 

    The larger ISP's will support the ports if you pay for a business class line that supports the extra IP addresses but it costs more and isn't worth it. Reason why is you can just a switch to the router if you're needing more ports. The cost isn't worth it for consumers versus business want it for data seperation.