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Forum Discussion
donawalt
Oct 17, 2021Mentor - Experienced User
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...
- 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.
plemans
Oct 18, 2021Guru - Experienced User
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.
donawalt
Oct 18, 2021Mentor - Experienced User
Thank you for your reply, that makes total sense! Everything works fine with the switch going thru the router, I just wondered why those ports were there. BTW my ISP is Comcast.
- plemansOct 18, 2021Guru - Experienced User
yeah, comcast doesn't support the mutliple public IP's unless you pay for them. I have comcast and they'll do whatever they can for extra $.