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  1. #1
    Untangler
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    Aug 2011
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    Default DHCP server is still not great

    under pfsense all of my statically assigned IP addresses "stuck" no matter how many times a client appeared and disappeared (cell phones including apples)

    under untangle, very few static assignments "stuck." usually (almost always) all clients would grab an address from the public pool (ie 192.168.1.100-110), ignoring the assignment the dhcp server was supposed to hand out (is 00:00:00:00:00:01 gets 192.168.1.1 etc)

    just turned the dhcp server on on my pi-hole, and everything is working perfectly again, static assignments and all.

    what is the issue with untangle's dhcp server? any ideas?

  2. #2
    Untangler jcoffin's Avatar
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    I use static DHCP reservation on several sites with no issues. To debug this you will need to use TCPdump and see what IP is offered to the client and see what the client uses. Clients control what IP is used.
    Attention: Support and help on the Untangle Forums is provided by
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    If you need Untangle support please call or email support@untangle.com

  3. #3
    Untangle Ninja sky-knight's Avatar
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    Apr 2008
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    Phoenix, AZ
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    Yeah, you've got something going on that's only you. I've had DHCP reservations intact on networks for literally over a decade with Untangle at this point. The feature works, as described. And I haven't a clue what could create the behavior you're seeing... aside from a rogue DHCP server on the network.
    f1assistance likes this.
    Rob Sandling, BS:SWE, MCP
    NexgenAppliances.com
    Phone: 866-794-8879 x201
    Email: support@nexgenappliances.com

  4. #4
    Untangle Ninja Jim.Alles's Avatar
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    Central PA
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    I would like some screenshots of your configuration.

    I can't help much with the other idea.
    If you think I got Grumpy

  5. #5
    Untangler
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    Aug 2011
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    What config screens should I post? Untangle, pi, or both?

    Tried an old Cisco wifi router too for giggles, its dhcp server worked perfectly too.

    Literally only untangle causing this behavior.

    Let me know what I need to post.

  6. #6
    Untangler jcoffin's Avatar
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    Post a screen capture of the static settings on the Untangle and the tcpdump of the DHCP request and response.

    tcpdump -i <network-interface> port 67 or port 68 -e -n

    [root @ ] ~ # tcpdump -i br.eth1 port 67 or port 68 -e -n
    tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
    listening on br.eth1, link-type EN10MB (Ethernet), capture size 262144 bytes
    16:18:08.754026 74:de:2b:3e:ee:28 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 192.168.72.191.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 74:de:2b:3e:ee:28, length 300
    16:18:08.754384 08:35:71:00:fc:27 > 74:de:2b:3e:ee:28, ethertype IPv4 (0x0800), length 342: 192.168.72.1.67 > 192.168.72.191.68: BOOTP/DHCP, Reply, length 300
    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

  7. #7
    Untangler
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    tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
    listening on eth1, link-type EN10MB (Ethernet), capture size 262144 bytes
    17:01:47.819122 cc:c0:79:61:ae:fd > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 332: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:c0:79:61:ae:fd, length 290
    17:01:47.819464 1c:1b:0d:62:cc:cf > cc:c0:79:61:ae:fd, ethertype IPv4 (0x0800), length 343: 192.168.0.1.67 > 192.168.0.24.68: BOOTP/DHCP, Reply, length 301
    17:01:47.876018 cc:c0:79:61:ae:fd > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 344: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:c0:79:61:ae:fd, length 302
    17:01:47.880091 1c:1b:0d:62:cc:cf > cc:c0:79:61:ae:fd, ethertype IPv4 (0x0800), length 343: 192.168.0.1.67 > 192.168.0.24.68: BOOTP/DHCP, Reply, length 301
    17:02:59.088241 7c:5c:f8:69:17:ca > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 192.168.0.53.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 7c:5c:f8:69:17:ca, length 300
    17:02:59.088988 1c:1b:0d:62:cc:cf > 7c:5c:f8:69:17:ca, ethertype IPv4 (0x0800), length 342: 192.168.0.1.67 > 192.168.0.53.68: BOOTP/DHCP, Reply, length 300
    17:03:24.896766 88:19:08:23:95:8c > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 88:19:08:23:95:8c, length 300
    17:03:24.903176 1c:1b:0d:62:cc:cf > 88:19:08:23:95:8c, ethertype IPv4 (0x0800), length 343: 192.168.0.1.67 > 192.168.0.70.68: BOOTP/DHCP, Reply, length 301
    17:04:07.764555 88:19:08:23:95:8c > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 88:19:08:23:95:8c, length 300
    17:04:07.767682 1c:1b:0d:62:cc:cf > 88:19:08:23:95:8c, ethertype IPv4 (0x0800), length 343: 192.168.0.1.67 > 192.168.0.70.68: BOOTP/DHCP, Reply, length 301


    standby for screen shot

  8. #8
    Untangler
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  9. #9
    Untangler
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    I'll let the tcpdump command run and dump into a log file for a few days so I can catch some more of this traffic.

  10. #10
    Untangle Ninja Jim.Alles's Avatar
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    These two, too please - from Interfaces
    dhcp Capture.PNG
    ipv4 Capture.PNG

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