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Setup Guide: Routers that are not able to turn off DHCP Service

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Firewalla
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To use Firewalla in DHCP Mode, it'll require you to disable DHCP service on Routers.

A small article on Simple mode vs. DHCP mode

 

For routers that don't provide an option to turn off the built-in DHCP service, here is a simple workaround.

 

Step 1: Connect Firewalla

Connect Firewalla to the Router. Connect Power. And wait for 5 to 7 min.

 

Step 2: Setup Firewalla to DHCP Mode

Launch the App, before starting to set up, pick "Manual Setup" => "DHCP Mode"

     

 

Step 3:  Configure Your Router

Take Xfinity XB6 as an example here.

Login Router and Tap on Connected Devices

 

Step 3-1: Reserve an IP for Firewalla

Write down the IP of Firewalla, e.g. 10.0.0.237 (yours will be different)

 

Step 3-2: Limit DHCP

Tap on Connection->Local IP Network and limit the IP range to Firewalla IP Address (you got from step 4)

Original IP range:

Change both Beginning Address and Ending Address to Firewalla's IP Address:

 

Step 4: Done

Now you may need to reboot or wait for devices to start getting the 192.168.218.x address.

 

Notes on IPv6:  

Some providers don't allow the router to fully disable or limit IPv6.  When this happens, firewalla will not be able to manage any site that's IPv6.  Resulting you can't see traffic or block any IPv6 sites.  We are working on a solution, this may take a while.   Example, if you block Firewalla.com it will work, but block google.com will not. 

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    Rodrigo Martins
    • Edited

    Today I have my Xfinity Gateway replaced because it was faulty, and for some reason this "tricky" no long works by

    change both Beginning Address and Ending Address to Firewalla's IP Address... It says that the Beginning  and Ending Address cannot be the same !

    I think they send me with new firmware, because the gateway looks like the same as the old one!

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    Firewalla

    What is the model of the xfinity gateway?

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    Rodrigo Martins

    Hi there, follow the information about the gateway:

    Gateway: Xfinity XB3

    Model:DPC3941T
    Vendor:Cisco
    Hardware Revision:1.0
    Processor Speed:2400.01 MHz
    DRAM Total Memory:1024 MB
    DRAM Used Memory:990 MB
    DRAM Available Memory:33 MB
    Flash Total Memory:4 MB
    Flash Used Memory:3 MB
    Flash Available Memory:1 MB
     
    System Software Version:
    eMTA & DOCSIS Software Version:2.3.10.13_5.5.0.5
    Software Image Name:DPC3941_3.12p8s1_PROD_sey
    Advanced Services:DPC3941T
    Packet Cable:2.0
     
     

     

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    Firewalla

    The DPC3941T should fully compatible with Simple mode.  Are you having problems with it?

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    Rodrigo Martins

    I'm running it with simple mode with no problem !

    But if you desire to run it in DHCP mode, probably due a gateway firmware update it doesn't allow you to do this trick by set the IP range the same start and end.

    My old gateway (same model) I was able to do this! 

    Thanks!

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    Peter Shaffer

    Correct. This no longer works on the XB6 as well.

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