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Windows Server 2008 R2 Thread, DNS issue - Server records being removed. in Technical; Hi, I have set my DNS to scavenge DNS records every 8 hours. This is in line with our DHCP ...
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    FN-GM's Avatar
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    DNS issue - Server records being removed.

    Hi,

    I have set my DNS to scavenge DNS records every 8 hours. This is in line with our DHCP server. I have attached a screenshot to show this.

    It seems to be getting rid of records for a couple of servers. I think for some reason they are not reporting back to the server in the 8 hour window and updating the time stamp.

    Please can i have some advice on this matter?

    Thanks
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    FN-GM's Avatar
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    Anyone please?

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    You don't need to have scavenging enabled all the time. I would also recommend you increase the DHCP lease to days rather than hours. Depending on the size of your scope and available number of free IPs, you should be able to increase the lease to days quite easily. Typically my lease is set to 7 days.

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    FN-GM (21st August 2011)

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    Mr.Ben's Avatar
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    You can set scavenging for individual records. When in DNS hit view and then advanced.

    Right click on the server record and untick 'Delete this record when it becomes stale'

    The timestamp will now be 'static'.

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    FN-GM (21st August 2011)

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    FN-GM's Avatar
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    Quote Originally Posted by Michael View Post
    You don't need to have scavenging enabled all the time. I would also recommend you increase the DHCP lease to days rather than hours. Depending on the size of your scope and available number of free IPs, you should be able to increase the lease to days quite easily. Typically my lease is set to 7 days.
    We are getting pretty short on IP addresses so this will help with that. I could increase it to a few days though.

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    I suppose realistically your only long term option is to change your network class. I find this calculator handy

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    Quote Originally Posted by Michael View Post
    I suppose realistically your only long term option is to change your network class. I find this calculator handy
    I only wish it was that easy. If we do that the provider of the WAN and core services will not support it. For example they would not allow any new IP addresses though the proxy server. Also if we expand the range we might start using IP addresses assigned to other school.

    We have been looking into the possibility to install a firewall so under that we can do whatever we like.

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    Yeah I see what you're saying. Is the firewall suggestion from the provider? What else did they suggest? Depending on what class your school and other schools are using, you could all end up having the same problems. At the very least a class B or even better a class A is the way to go.

    I suppose the other alternative is IPv6, but I don't know of any school using this in a domain environment.

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    Is the firewall suggestion from the provider?
    Nope me. After other schools being charged £700 to open up ports we haven't approached the provider until the council get things sorted as to what the schools should be paying for etc.

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