Netgear CM1200 is not letting my PC to access internet.

[Eli38]

Hello everybody, my PC is connected directly to Netgear CM1200 cable modem's port doesn't establish the internet connection for some reason.

However, I don't have such problem when my PC is connected to the router and the router is connected to the modem.

Any idea how can this be fixed?

[plemans · Accepted solution]

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@Eli38 wrote:
Yes, at the same time. Why is that a problem?

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yes, most ISP's only give a single IP address. 

Some allow more than 1 but its rare and tends to business lines.

Port 1 and port 2 can be aggregated together for port aggregation. its also fairly rare in consumer routers to use.

That means, if you're not running a business line, have an ISP that allows multiple public IP addresses, or have a router that supports wan aggregation, only 1 port can be used at a time. 

so for the average consumer, the cm1000 (1 ethernet port) or the cm1100 (2 ethernet ports) do everything they need. 

[plemans]

are you leaving the pc and the router connected to the modem at one time?

If so, that'd be why

[Eli38]

Yes, at the same time. Why is that a problem?

[plemans · Accepted solution]

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@Eli38 wrote:
Yes, at the same time. Why is that a problem?

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yes, most ISP's only give a single IP address. 

Some allow more than 1 but its rare and tends to business lines.

Port 1 and port 2 can be aggregated together for port aggregation. its also fairly rare in consumer routers to use.

That means, if you're not running a business line, have an ISP that allows multiple public IP addresses, or have a router that supports wan aggregation, only 1 port can be used at a time. 

so for the average consumer, the cm1000 (1 ethernet port) or the cm1100 (2 ethernet ports) do everything they need. 

[Eli38]

Xfinity is my provider and they told me I should be able to use those ports. Well their tech support don’t know a lot so... I guess you are right. Thanks

[Eli38]

Called Netgear and they confirmed that has to do with my ISP and 1 IP address. 

[plemans]

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@Eli38 wrote:

Called Netgear and they confirmed that has to do with my ISP and 1 IP address. 

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Sorry, 

I wish Netgear had a bit more information on their boxes for educating the average users about basically only 1 port being useful for most people.