Web GUI access to cable modem



  • Please excuse my ignorance as I have just installed my first pfSense 2.2.4 instance yesterday. I am having trouble establishing rules/NAT to enable access to my cable modem which sits on a different subnet on the other side of the firewall, obviously connected to the WAN port. The cable modem in question hosts a web GUI with a static IP of 192.168.100.1 which differs from my internal subnet of 192.168.1.0/24.

    Following the 'Configure NAT' step in the below article still has not enabled access to the cable modem. I ignored the 'Configure a new Interface' step in the article as it seems to only apply to PPPoE/DSL connections.
    https://doc.pfsense.org/index.php/Accessing_modem_from_inside_firewall

    Any help would be greatly appreciated. I have included a simple map of my network setup and a screenshot of the outbound NAT rule I have created below.

    Network map of current setup:

    Outbound NAT rule I currently have in place and expect should work:

    TL;DR: How do I enable access the my cable modems web GUI from inside the firewall which is on a different subnet?



  • I have done some research in the logs and have noticed pfSense is saying it cannot resolve the IP address of my cable modem.


  • Netgate

    @Bizbot:

    I have done some research in the logs and have noticed pfSense is saying it cannot resolve the IP address of my cable modem.

    What are your firewall rules on LAN?




  • Banned

    Honestly, the NAT is useless. In fact, it's breaking things, IMHO. The "cannot resolve" is not an error.