Connect to Modem through Firewalla

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shawnspargo

• August 18, 2024 13:52

Trying to access my modem through Firewalla. Network is 192.168.0.1/24 but modem is factory assigned 192.168.100.1. Setup is modem (192.168.100.1)>>>firewalla as router>>>192.168.0.1/24 LAN Created source network for the 192.168.100.1/24 but I think I’m still missing something. Modem is an Arris S33 Firewalls is Gold Plus

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  Bob O'Hara

  • August 18, 2024 16:28

  The 192.168.x.x address range is considered a private address range. It is generally not routed to the internet side of a router. You will need to set up a route to your modem on the WAN interface of your Firewalla.

  Tap “Routes” on the main FW page, select the target as your modem’s IP address. Select the device/group/LAN from which you want to access the modem and select your WAN interface. This should allow you to reach your modem.

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  shawnspargo

  • August 18, 2024 20:56

  Hmm…

  I just followed your suggestion but no luck. I think I'm going to attempt to connect my laptop directly to the modem to ensure the user interface is active.

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  shawnspargo

  • August 18, 2024 22:05

  So I can confirm, when I access the user interface directly from a laptop it will connect at 192.168.100.1 BUT, I must first set the NIC to an IP address on this subnet and set the gateway address to 192.168.100.1.

  I wonder if that is the issue? I must somehow bridge the WAN side of the Firewalla to 192.168.100.1/24 and I’ve done this before years also when I was in Frontier but I cannot remember how to do this now.

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  shawnspargo

  • August 19, 2024 06:29
  • Edited

  So I deleted the route that was suggested since it didn’t seem to be helping and it occurred to me that maybe there is a rule that has 192.168.100.1 blocked by default; however, I have been unable to find anything so I created a rule allowing the IP address throughout the entire network. Still no luck.

  Interestingly, I AM NOT able to ping 192.168.100.1 but I am still unable to connect to it via web browser.

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  Firewalla Team

  • August 19, 2024 10:09

  @shawnspargo, by default, the traffic should have been forwarded to the WAN network. I feel the modem will only handle the traffic itself when the flow is coming from the subnet 192.168.0.1/24. Try ping 192.168.100.1 or curl from your Gold Plus directly. 

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  shawnspargo

  • August 20, 2024 02:26
  • Edited

  Found the problem. It’s with the Arris S33 model of modem. I swapped it out today for a Netgear CM3000 and BAMM, everything worked first try. No routes, no NAT sources, no rules, etc. It just worked.

  Thanks to the kind folks who helped.

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