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  1. #1
    Untangler
    Join Date
    Oct 2008
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    85

    Default ATT Modem DHCP and Management

    Hello. I have an ATT modem where the DHCP server cannot be turned off. Somehow DHCP was answering requests and causing issues the last few weeks even though I've had this thing for years. I did find one of the wifi antennas was still enabled. Those are all disabled so maybe my DHCP issue is resolved. I've also tried adding a rule to untangle to block ports 67 and 68. Not sure it's really working because I never see anything in the firewall block report for those ports.

    My modem has the standard IP address of 192.168.1.254. That is a different network than my internal network, but I can still connect to it from my internal network through untangle. I'm really not sure how that works.

    My setup is pretty standard:

    Internet <==> Modem (192.168.1.254) <==> Untangle <==> Internal network (192.168.xyz.0)

    How am I able to get to my modem's management address at 192.168.1.254 through the untangle?

    Any ideas?

    Thanks
    James

  2. #2
    Untangler
    Join Date
    May 2008
    Posts
    573

    Default

    Is it in bridge or router mode?

  3. #3
    Untangler
    Join Date
    Oct 2008
    Posts
    85

    Default

    Router mode. Configs on the network cards are "Addressed".

    Thanks

  4. #4
    Untangler jcoffin's Avatar
    Join Date
    Aug 2008
    Location
    Lake Tahoe
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    Default

    DHCP will not pass through NAT (router). Yes, if the PCs are bypassing the Untangle via WiFi to the ATT router, it will get DHCP from ATT.
    Attention: Support and help on the Untangle Forums is provided by
    volunteers and community members like yourself.
    If you need Untangle support please call or email support@untangle.com

  5. #5
    Untangler
    Join Date
    Oct 2008
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    85

    Default

    How does the management address pass through untangle?

    Thanks
    James

  6. #6
    Untangler
    Join Date
    May 2008
    Posts
    573

    Default

    Is your internal netmask /24 - 255.255.255.0?

  7. #7
    Untangler
    Join Date
    Oct 2008
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    85

    Default

    It is. So that's covering the third octet then. Even so, I put a rule in to drop all traffic for 192.168.1.0, yet I can still connect.

  8. #8
    Untangler jcoffin's Avatar
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    Aug 2008
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    Default

    Quote Originally Posted by jpifer View Post
    How does the management address pass through untangle?

    Thanks
    James
    It doesn't. Untangle will never see the traffic if you are using the WiFi on the ATT Router.
    Attention: Support and help on the Untangle Forums is provided by
    volunteers and community members like yourself.
    If you need Untangle support please call or email support@untangle.com

  9. #9
    Untangler jcoffin's Avatar
    Join Date
    Aug 2008
    Location
    Lake Tahoe
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    Default

    Quote Originally Posted by jpifer View Post
    It is. So that's covering the third octet then. Even so, I put a rule in to drop all traffic for 192.168.1.0, yet I can still connect.
    Again if the WiFi of ATT is used, your traffic is not going through Untangle.
    Attention: Support and help on the Untangle Forums is provided by
    volunteers and community members like yourself.
    If you need Untangle support please call or email support@untangle.com

  10. #10
    Untangler
    Join Date
    Oct 2008
    Posts
    85

    Default

    Not using the ATT WiFi. It is disabled.

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