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

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    Rodrigo Martins

    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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    Firewalla

    @peter, any details on why it is not working on the XB6?

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    Peter Shaffer

    Same reason as posted above. No longer able to set the IP range to the same start and end. Work around may be putting device in bridge mode and using a supported router.

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    Firewalla

    Peter, interesting.  So the new firmware forcing at least 2 devices in DHCP? if that's the case, the method may also work (one device may not be able to be monitored).  

    Also, if you can, please try the "experimental simple mode" (you will need to turn on DHCP on your router first).  Experimental simple mode is a set of customized fixes, that may make the router work. 

     

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