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IP changes on port forwarding

I set up port forwarding, port 80 to

Port forwarding works fine.

After a day or so changes to various IPs. such as, and both will be listed.

Port forwarding stops working.

I click <resolve now> and it changes back to

and starts working again. But will change back after a day.

How can I keep this from happening?

Labels (1)
Re: IP changes on port forwarding
Super User
Super User

#1 What is the exact brand and model of your router?

#2 If you are not on FIOS, what is the brand and model of your modem?