Why does my external IP change?

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cm10014
Posts: 1
Joined: Thu Jan 17, 2013 8:37 am

Why does my external IP change?

Post by cm10014 » Thu Jan 17, 2013 8:48 am

My Ooma is set up with modem/Ooma/router. I recently changed to modem/router/ooma see if there was any difference in bandwidth and my connection became unstable (even after resetting my wireless), and there was a drop in performance. After switching back to modem/Ooma/Router and running Speedtest, I noticed that my static external IP changed depending on the Ooma setup. Any thoughts as to why the IP changes depending on the setup?

murphy
Posts: 7207
Joined: Tue Jan 27, 2009 12:49 pm
Location: Pennsylvania

Re: Why does my external IP change?

Post by murphy » Thu Jan 17, 2013 9:01 am

It is highly unlikely that you have a static IP unless you are specifically paying for a static IP.
If you are you are supposed to hard code the static IP address into the first box behind the modem.
That also includes entering the mask, gateway, and DNS server IP addresses as supplied by your ISP.

If instead you have a dynamic IP address, like 99.999% of residential cable users, the IP address is controlled by the MAC address that the first device after the modem presents to the modem. Change the device after the modem and your IP address will change.
Customer since January 2009
Telo with 2 Handsets, a Linx, and a Safety Phone
Telo2 with 2 Handsets and a Linx

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