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DHCP Question

Discussion in 'Networks' started by Nelix, Mar 13, 2013.

  1. Nelix
    Honorary Member

    Nelix Gigabyte Poster

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    Hi All

    It's been a long time since I frequented this place, good to see it is still going strong.

    I have a question relating to DHCP, will a DHCP server only respond to DHCP requests for the domain that it is a member of.

    EG: 2 domains on the same subnet (domain 1 and domain 2), each domain has there own DHCP server/s, will requests from clients in domain 1 get a response from a dhcp server in domain 2 or will requests be domain specific?

    Cheers

    Nelix
     
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  2. csx

    csx Megabyte Poster

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    Think about it another way, if the PC isn't a member of the domain - will it get an IP address from a DHCP server? yes. The DHCP server will broadcast on the whole subnet regardless of what domain.

    Therefore having two DHCP servers could cause issues with both assigning duplicate IPs.
     
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  3. westernkings

    westernkings Gigabyte Poster

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    So just for my own clarification, what's the best way to set up 2 sub domains so they use different DHCP scopes (or subnets) whilst being able to communicate?
     
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  4. SimonD

    SimonD Terabyte Poster Moderator

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    You would want to configure MAC filtering.
     
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  5. Simonvm

    Simonvm Kilobyte Poster

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    In real life, you wouldn't set it up like this.
     
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  6. csx

    csx Megabyte Poster

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    That was my thought, same with the original post... unless you need to keep them separate for a reason (sensitive data etc)

    Bookmarked! Never know when that may come in handy, looks a bit fiddly though!
     
    Last edited: Mar 13, 2013
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  7. AJ

    AJ Administrator Administrator

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    If you are using server 2008 R2 this facility is built in. not sure how DHCP works in server 2012 but what would be a nice feature is to have this on a per scope basis.

    - - - Updated - - -

    Just read up about server 2012 and not only can you put your DHCP deployment into HA but MAC filter via scopes as well.

    Linky
     
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  8. Chief

    Chief Bit Poster

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    I suppose this is considered a necro, but... are you wanting two different networks to ride the same wires? Also, when you say communicate, you don't mean with each other I presume? I've never really messed with vlans, but I guess you could separate the subnets in your switch. You could also support both of the subnets with one dhcp server if you wanted.
     
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  9. AgentGPF

    AgentGPF New Member

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    A DHCP server will respond to ANY incoming request unless it is specifically told not to do so ("deny booting", in isc-dhcp-server for example).

    Your best best is the obvious, if these are separate domains, why are they not separated with a router? When you break the broadcast domain, you separate DHCP.
     

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