I have a Comcast Cisco DPC3941B modem that has features randomly stop working. Today it's 1-1 NAT. I have two WAN IP addresses mapped to two LAN IP addresses. The outside world can ping the two LAN devices fine but they can't maintain a TCP/IP stream. Just a few packets trickle through per minute. The two LAN devices have the same problem reaching the outside world while 1-1 NAT is turned on for them.
There's nothing that my 'cusadmin' login can do to see what's wrong. I called customer service but reached somebody with no technical training. How do I get this fixed?