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Windows Thread, What's the worst that can happen? in Technical; We've had mutiple DNS entries with the same IP addresses for some time now and I'm looking at the ageing ...
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    Zourous's Avatar
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    What's the worst that can happen?

    We've had mutiple DNS entries with the same IP addresses for some time now and I'm looking at the ageing & scavenging settings to help tidy it up.

    We have two DHCP servers with DNS on each one. The DHCP lease time is set at 5 days. Would it be best to set the refresh and non refresh to 2 days each?

    Also I'm a bit paranoid about changing these settings as I'm no DNS expert. I assume the scavenging will not touch anything non-workstation related or does it automatically ignore addresses outside the DHCP scope?

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    zag
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    Whats the point in having 2 DHCP servers?

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    nephilim's Avatar
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    Quote Originally Posted by zag View Post
    Whats the point in having 2 DHCP servers?
    I second this question.

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    Redunancy. Load balancing. The usual reasons you want two of anything

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    Quote Originally Posted by zag View Post
    Whats the point in having 2 DHCP servers?
    Microsoft recommend using the 80\20 rule for DHCP redundancy
    80/20 Rule

    Paul

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    I was under the impression that you could only have one DHCP server on a network, and more that that would result in duplicate IPs being issued.

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    Zourous's Avatar
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    We are a split site, so this is why it is useful for us.

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    Quote Originally Posted by clareq View Post
    I was under the impression that you could only have one DHCP server on a network, and more that that would result in duplicate IPs being issued.
    Not if you use 2 scopes. Read 80/20 Rule

    Paul

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    BatchFile's Avatar
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    Quote Originally Posted by clareq View Post
    I was under the impression that you could only have one DHCP server on a network, and more that that would result in duplicate IPs being issued.
    Nope, you can have as many as you like as long as the scopes don't overlap - we have one for 10.nnn.17.xx, one for 10.nnn.18.xx and one for 10.nnn.19.xx - so that if one falls over everyone can still get an IP, amongst other reasons

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    Yes, the 80/20 rule post appeared as I was writing my reply. I have read it, and stand corrected

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    Zourous's Avatar
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    Ok enough about DHCP's, does anyone know much about how the ageing & scavenging works?

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    I'm in the process of designing a new network here. We have three DC's so I am planning on setting up a 33/33/33 rule.

    DC1: x.x.1.1 - 255
    DC2: x.x.2.0 - 255
    DC3: x.x.3.0 - 255

    We would never have more than 500 devices so this way we can lose a server and still have enough in our scope to continue leasing them among the two remaining servers.

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