Static IPs not working with new Business Internet service?
We have a 5 static IP block associated with our new Comcast Business Internet service. Currently, our Comcast modem is in bridge mode because we are providing our own firewall to sit behind the modem.
When I configured a static IP in our assigned IP range to the firewall's external facing interface and plugged that into the first port on the Comcast modem, attempts to ping our assigned gateway address were rejected. However, when I set the external interface to DHCP, the device was able to receive an IP address from the Comcast network.
My questions are:
a) Is connecting to the modem using DHCP, when you've been assigned static IP range, supposed to be possible like this?
b) What are the common troubleshooting methods to use, when attempts to connect to the Comcast network using a Comcast assigned static IP aren't working?