Configure IPv4 Firewall on your ZyXEL PK5000Z 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 directly to your modem.
  1. Open a web browser and go to
  1. 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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