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  1. #1
    Newbie
    Join Date
    Mar 2015
    Posts
    10

    Default DHCP stop working suddenly to some computers

    This is my Network Interface DHCP Configuration.

    ipadd.png

    The newly connected laptop/mobile phone will get this

    ipadd2.png

    Can you help me with this one. Please

  2. #2
    Untangle Ninja sky-knight's Avatar
    Join Date
    Apr 2008
    Location
    Phoenix, AZ
    Posts
    26,494

    Default

    Other than your gateway override field being populated when it doesn't need to be... this doesn't make any sense. Untangle can't get arp entries for the 169 network as configured...

    I'm also wondering why Untangle has a 192 address on both external, and internal...
    Rob Sandling, BS:SWE, MCP
    NexgenAppliances.com
    Phone: 866-794-8879 x201
    Email: support@nexgenappliances.com

  3. #3
    Newbie
    Join Date
    Mar 2015
    Posts
    10

    Default

    My internet connection is being hosted by another server

    > assigned at 192.168.112.22
    > gateway: 192.168.112.17

    From there, it will be transported by sa radio:
    powerbeam 5ac 400 (192.168.255.60)
    Receiver: powerbeam 5ac 400 (192.168.255.61)
    in a gigabit switch (192.168.255.1)

    I'm not really good in explaining.. hope my diagram can be understood.

    configuration.png
    Last edited by boang311; 09-27-2018 at 01:41 AM.

  4. #4
    Untangle Ninja sky-knight's Avatar
    Join Date
    Apr 2008
    Location
    Phoenix, AZ
    Posts
    26,494

    Default

    That's fine, double NAT is a pain sometimes but in this case seems warranted. Regardless, the Internet connection isn't using an IP range that conflicts with what you've got internally, so there's no conflict to cause an issue internally.

    Have you confirmed the MAC address you're seeing with the 169 address belongs to the device that's not getting a real IP?
    Rob Sandling, BS:SWE, MCP
    NexgenAppliances.com
    Phone: 866-794-8879 x201
    Email: support@nexgenappliances.com

  5. #5
    Untangle Junkie dmorris's Avatar
    Join Date
    Nov 2006
    Location
    San Carlos, CA
    Posts
    17,486

    Default

    One thing to check is with the packet test or tcpdump just listen to port 67 and look for the DHCP requests and responses hitting the internal interface.

    Do you see the request when you plug the device in? Do you see the response?
    That will allow you to isolate the issue.
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