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Thread: isc-dhcp-relay

  1. #1
    Master Untangler johndball's Avatar
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    Default isc-dhcp-relay

    I installed the ISC-DHCP-RELAY package on UT 11 in an attempt to handle some DHCP forwarding on six VLANs to a Windows 2k12 DHCP server on one of those VLANs.

    I SSH'd into the server and started the service after configuring the options. "service isc-dhcp-relay start". When listing all services, the isc-dhcp-relay service shows ? whereas other services show - or +. Is there something else I should be running?

    I'm a Linux noob so any help is appreciated.
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  2. #2
    Untangler jcoffin's Avatar
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    Just a warning, any changes on command line are not supported and will break upgrades.

    Terminal_warning2.png
    Last edited by jcoffin; 10-15-2014 at 09:32 PM.
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  3. #3
    Untangle Ninja sky-knight's Avatar
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    To perform this operation even half safely you'd have to disable dnsmasq first, that kills Untangle's internal DNS mechanism which will have a massive negative impact on everything else.

    I'm sorry, but I don't see how this will ever work. You'd be better off trying to upgrade dnsmasq to a current unsupported release and configure that for relay. A project I might just try sometime...
    Rob Sandling, BS:SWE, MCP
    NexgenAppliances.com
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  4. #4
    Untangle Junkie dmorris's Avatar
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    Or just do it the right way and configure your DHCP server with the appropriate vlan interfaces.
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  5. #5
    Untangle Ninja sky-knight's Avatar
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    What you mean get rid of DHCP relay entirely? What a concept!

    It's not always an option... but when it is, it really should be used. DHCP relay is a mess...
    Rob Sandling, BS:SWE, MCP
    NexgenAppliances.com
    Phone: 866-794-8879 x201
    Email: support@nexgenappliances.com

  6. #6
    Master Untangler johndball's Avatar
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    @jcoffin - Well aware of the obligatory "You break it, you bought it" warning.
    @ sky-knight and dmorris; After reading for hours on here and other places (I alone contributed to %10 of Google's usage yesterday ), the fact that both of y'all chimed in and said it would fail has shut down this rabbit hole expedition.

    VLAN interfaces on the DHCP server then.

    Thanks for the quick replies.
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    "I have often regretted my speech, never my silence." - Xenocrates
    https://www.johndball.com

  7. #7
    Untangle Ninja dwasserman's Avatar
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    For inter vlan traffic put a cisco (or any other L3) switch, sumarize all your network and let untangle manage the border gateway security.
    The world is divided into 10 kinds of people, who know binary and those not

  8. #8
    Untangle Ninja sky-knight's Avatar
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    Quote Originally Posted by johndball View Post
    @jcoffin - Well aware of the obligatory "You break it, you bought it" warning.
    @ sky-knight and dmorris; After reading for hours on here and other places (I alone contributed to %10 of Google's usage yesterday ), the fact that both of y'all chimed in and said it would fail has shut down this rabbit hole expedition.

    VLAN interfaces on the DHCP server then.

    Thanks for the quick replies.
    Well the good news is, Untangle v12 or whatever version of Untangle ends up based on the next version of Debian, will be able to do this. Also, pulling a dnsmasq package from Debian's unstable could potentially do this now. As I said, it's a project I'd like to take a peek at. I'm aware of no configuration changes for dnsmasq, so a newer version wouldn't likely break anything. But it is a hack, and why hack it up when you can just vlan it?
    Rob Sandling, BS:SWE, MCP
    NexgenAppliances.com
    Phone: 866-794-8879 x201
    Email: support@nexgenappliances.com

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