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DHCP fault tolerance

Discussion in 'Active Directory Exams' started by Sparky, Nov 21, 2007.

  1. Sparky
    Highly Decorated Member Award

    Sparky Zettabyte Poster Moderator

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    Just been reading the ‘Microsoft’ way to set up fault tolerance for DHCP.

    Basically the recommendation is to apply the 80/20 rule to split the LAN scope between 2 servers which is fair enough. However MS also recommend that 20% of the range is on a server on a remote subnet.

    This is what I don’t get, I will need a compatible router to forward the DHCP broadcasts and if I don’t then I will have to install a DHCP relay agent. So why not just put the 20% on the server instead of having a relay agent? Also surely putting 20% of the IPs on a remote subnet is also a potential problem as it may be at the other end of a VPN tunnel (which may be down) or behind a router which is not functioning correctly.

    Thoughts? :blink
     
    Certifications: MSc MCSE MCSA:M MCSA:S MCITP:EA MCTS(x5) Security+ Network+ A+
    WIP: Exchange 2007\2010
  2. Boycie
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    Boycie Senior Beer Tester

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    Sparks,

    A guy i met in India was talking about this, and he said 80/20 works, remote agent doesn't!

    "remember it does when you are in the exam though"!

    Si
     
    Certifications: MCSA 2003, MCDST, A+, N+, CTT+, MCT
  3. Sparky
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    Sparky Zettabyte Poster Moderator

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    Yeah, 80/20 is fair enough but if the 20 is on another subnet then there are other factors to consider such as the router forwarding the DHCP requests which you cant assume. :blink
     
    Certifications: MSc MCSE MCSA:M MCSA:S MCITP:EA MCTS(x5) Security+ Network+ A+
    WIP: Exchange 2007\2010

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