We have a CR open to solve the following problem. We use the LAN on the modem to connect to our Firewalled network to test VPN.VOIP etc, and to separate WiFi services on the modem for users mobile phone's etc from the internal network. I do this because it gives me an external IP address. This all worked perfectly up until today. The modem was offline 2 times overnight unexpectedly. Now when I try and connect via VPN/VOIP it just hangs. If I try and connect to a web service running internally it never connects. If I tracert an IP address in our block it never connects. I can connect to anything outside of our IP block fine. Level 2 support say's it's not on Comcast's end. I'm the only one that has access to our firewall and I know nothing has changed for weeks. Any thoughts would be appreciated. They are send out a field tech tomorrow.
It is a firmware issue that Comcast is now aware of the model is DPC3939B
This has continued to be a problem every time Comcast pushes out new firmware we have to call Level 2 support to roll back the firmware to.
Thank you for all your shared research on this firmware topic. I will be sure to forward this issue to my management for review. Please feel free to post about any more findings you may turn-up.
Thank You again!