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  1. #1
    Untangler
    Join Date
    Aug 2014
    Posts
    47

    Default DHCP server not working

    This makes no sense to me, everything is set up as it should (I think!). The internal network card has the DHCP section compiled with all the details, the general DHCP section has a bunch of static entries... and yet, if I disable my current DHCP server everything panics and loses connectivity! I really don't get it, trying to connect something leads to that something not getting an IP

  2. #2
    Untangle Junkie dmorris's Avatar
    Join Date
    Nov 2006
    Location
    San Carlos, CA
    Posts
    17,747

    Default

    You can use the packet test in config > network > troubleshooting

    or tcpdump to just watch dhcp requests and responses
    tcpdump -e -i eth1 -n "port 67 or port 68"
    instead of eth1 use your internal interface

    dhcp is a very simple request/reply protocol

    The problem can be roughly isolate to one of 3 areas:
    1) Untangle sees no DHCP requests (problem is elsewhere)
    2) Untangle sees DHCP requests but does not respond (problem is Untangle config or likely somewhere in Untangle)
    3) Untangle sees DHCP requests and sends response (problem is elsewhere)
    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

  3. #3
    Untangler
    Join Date
    Aug 2014
    Posts
    47

    Default

    I see, so what does this mean? In my ignorance on the matter it seems it's not responding, I set the test time to 30 seconds and port 67, but it's the same on 68

    Code:
    01:05:11.554150 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:11:11:11:11:11, length 300
    01:05:14.193777 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:11:11:11:11:11, length 300
    01:05:18.295957 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:11:11:11:11:11, length 300
    01:05:27.198516 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:11:11:11:11:11, length 300
    01:05:35.896462 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:11:11:11:11:11, length 300
    Mon Oct 29 2018 01:05:38 GMT+0100 (Central European Standard Time) - Test Completed
    (MAC addresses edited)

  4. #4
    Untangle Junkie dmorris's Avatar
    Join Date
    Nov 2006
    Location
    San Carlos, CA
    Posts
    17,747

    Default

    That means untangle is seeing the request but Untangle is not responding.
    I would guess something in your configuration like
    DHCP not enabled
    access rules changed
    bad options in advanced dns & dhcp options
    etc
    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
    Aug 2014
    Posts
    47

    Default

    Found it! In access rules under advanced network config, the "Allow DHCP on non WANs" wasn't enabled.

    Enable, save, run the test again... and everything works! Thanks

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