Configure IPv4 Firewall on your Actiontec PK5000 modem

Enabling the IPv4 Firewall is optional. When the firewall is activated, security is enhanced, but some network functionality will be lost.
Blue Advanced Step 1-3

1.  Connect a device, such as a computer or tablet, directly to your modem using the Ethernet cable (usually yellow).

2.  Open a web browser and type http://192.168.0.1 into the web address field.

3.  Select "Advanced Setup."

  1. Select "Firewall Settings." From here you can view or edit this feature.
Stealth Mode: yeah it sounds cool, but don't enable it unless you understand the technical impacts. Enabling stealth mode prevents the router from responding to probing requests. The router will still answer incoming requests for authorized apps. Unexpected requests, such as ICMP (ping) are ignored.
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