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Wireless Networks Thread, Global Catalogues in Technical; Seamless? Don't be foolish. This is Windows....
  1. #16

    Geoff's Avatar
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    Re: Global Catalogues

    Seamless? Don't be foolish. This is Windows.

  2. #17
    mrforgetful's Avatar
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    Re: Global Catalogues

    Quote Originally Posted by Geoff
    Seamless? Don't be foolish. This is Windows.
    hehe, I forget sometimes and expect things to be perfect!

    Well maybe I'll leave it all as is now and do some work people will actually notice...

  3. #18

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    Re: Global Catalogues

    Quote Originally Posted by mrforgetful
    I know as we had it before if server1 went down then obviously nothing worked (as although we do have another DNS Server) it was the only GC and DHCP Server.

    Now I've added the GC role and a bit more DHCP scope to another server (and set the scopes DHCP options primary DNS to the second DNS server), if my main server goes down clients should automatically use the remaining one?
    Yes - as long as your DNS is properly configured.

    From startup you want 2 (or more!) DHCP servers - otherwise the machine can't get an IP and nothing much network will happen.

    Once it's started it will query DNS for info about GCs and DCs - you need to have 2 DNS servers handed out by the DHCP so that if either goes you're still OK.

    Provided that the DNS has the right info about GCs/DCs then as the machine starts up it will get an answer to query for DC etc that will let it you use either of the servers.

  4. #19
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    Re: Global Catalogues

    Quote Originally Posted by sidewinder
    As for load balancing - I have DHCP on both of my DC's with the whole scope on both. On one I exclude half of the scope, on the other I exclude the other half. So each server issues roughly 50% of its addresses and the clients are roughly split 50/50 with what server they get their lease from.
    And if one server was to go down, I would just remove the exclusion and let it do the whole scope
    How have you achieved this? And how do you set it up so that the 2 DHCP servers don't both try and lease an IP? Or is it just a case of the PC is leased the first one it gets?

  5. #20
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    Re: Global Catalogues

    @srochford - cheers for clearing that for me. DNS should be set ok hopefully, both DHCP servers have two DNS addresses to use so think it will be ok.

    @TeddyKGB - I'm guessing he's set both DHCP servers to use the same scope, you then set an exlusion range on both but one excludes the lower range and the other excludes the higher range. When one server breaks you just remove the exclusion that's set on the working server, there's a technet article on it but I don't have the link sorry.
    On startup the PCs will send a DHCP query and the first server that gets it will handle the address.

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    Re: Global Catalogues

    Yeah thats exactly how I've done it

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