If you meant switching from DSL to CABLE, I would suggest just giving your router a reset. Here are the procedures for your particular router:
Reset Procedure Step 1 Locate the reset pinhole on the back of the unit.
Step 2 With the unit powered on, press and hold the Reset button.
Step 3 Hold the Reset button for about 10 seconds.
Step 4 Release the Reset button.
Step 5 The unit will reboot. Allow 20-30 seconds before reconnecting.
Step 6 The device is now at factory defaults.
make sure to setup your wireless security again and make sure to set an admin password on your router after the restart.
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