If you need to use your own router/firewall instead of the next to useless one that Comcast supplies:
Using a web browser login to 10.1.10.1, Cusadmin / highspeed
Under Firewall, ensure checkmark for “Disable Firewall for True Static IP Subnet Only”
Under LAN, Tab IP Settings, remove checkmark for “Enable LAN DHCP”
Modem will reboot
The device is now in bridge mode and you can configure your router/firewall with the static IP info.