Some General Questions…

the dust that heard asked 2 years ago

I've been looking around my router's control panel. It's a NetGear WGR614v8 and is wireless, but I don't think that's critical information.

There's an informational tab which shows the router's IP address, subnet mask, and 'lease time'. I've come to learn that the lease time is the period through which the device will maintain its specified IP address from DHCP.

Some questions:

The router's IP address is the same as the IP address my computer is reported to have by external sources (eg. whatismyip.com homepage, Google query, etc.) Is this normal? Does my computer's external IP address depend on the router's IP address?

My router's lease time is about a week. It expired once four days ago, and is set to expire again in 58 hours. My question: is this lease time expiration date seems to be an opportunity for me to change my computer's external IP address? Is so, how do I accomplish it? Do I 'release' and 'renew' the router's network settings at the time of expiration? Do I 'release' and 'renew' my computer's settings? Do I unplug the router? etc.

Thank you for your help.

1 Answers
Shnerdly Staff answered 2 years ago

Thanks for your question the dust that heard.

"There's an informational tab which shows the router's IP address, subnet mask, and 'lease time'. I've come to learn that the lease time is the period through which the device will maintain its specified IP address from DHCP.

Some questions:

The router's IP address is the same as the IP address my computer is reported to have by external sources (eg. whatismyip.com homepage, Google query, etc.) Is this normal? Does my computer's external IP address depend on the router's IP address?"
Yes this is normal. Your external IP address is always the address that your router gets from your ISP. It will be assigned by the ISP's DHCP Server and in your case, can not be set statically by you. You must leave it set to obtain it's address from the DHCP Server.

"My router's lease time is about a week. It expired once four days ago, and is set to expire again in 58 hours. My question: is this lease time expiration date seems to be an opportunity for me to change my computer's external IP address? Is so, how do I accomplish it? Do I 'release' and 'renew' the router's network settings at the time of expiration? Do I 'release' and 'renew' my computer's settings? Do I unplug the router? etc."

With a Cable ISP such as yours, the lease time doesn't really play a part in when you would get a new IP other then when the ISP wishes to change your IP. The Cable company uses the MAC address of the first device connected to the Cable Modem to assign the IP. That first device would be your Router. The Routers WAN or Internet port has a unique MAC address that the Cable Modem sees and remembers.

To change your IP, you can clone the MAC address of the WAN port in the Router settings. All MAC addresses are unique so you should use a MAC address of something you have physical possession of. It can be the MAC from any ethernet device such as your computers ethernet port. That MAC is on the protected side of your router so it can be used safely. It could also be the MAC address of an old ethernet controller that is no longer in use.

After you clone the MAC address, you MUST do a cold reboot of your Cable Modem. That means unplugging the power to the Modem and removing backup batteries if it has them so that ALL lights on the Modem go out. I recommend doing this with the Router powered off as well. To do the startup, power on ONLY the Modem and allow about 60 seconds for it to boot, then start the Router and give it about 30 seconds to boot. Then start the computers.

You should then have a new IP address.

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