need a 2nd IP adress for my Arris T25
How do I get a 2nd IP address for my Arris T25 cable modem? I have two ethernet ports on back of modem. One plugs into my router and trying to plug the other directly from cable modem to computer but says ethernet doesn't recognize IP address.
In talking with Comcast support, they said only have one IP address so I guess I can't plug from modem to computer since I need the one port for WIFI router. I can run ethernet from computer directly into router but extremely slow speed vs. just having computer use WIFI (no hard wire).
Looked on the xfinity rate sheet for my area and didn't see option to purchase a 2nd IP address.