Setting up a firewall is supposed to be an ultimate solution of security issues.
Cable modem users can get this IP by DHCP or Static. That is totally up to your provider's policy. And DHCP can be configured as Dynamic and Static too, if you are familiar with dhpcd.conf you should know this.
If your PC is a UNIX box other than Windows, you should take a close at your machine as there should be a full procedure that you need to follow to lock your computer down to a secure one.
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