brahma Posted July 28, 2008 Posted July 28, 2008 Well thanks to all your tips on this forum, DNS scavenging ran on my network this morning and scavenged 704 records!! So I no longer have duplicate IP addresses in my DNS!!! Thanks guys. How long should I wait before reducing the lease time on my DHCP servers now - current lease is set to 14 days. Recommendations on here are to set to 7 days. I thought about setting laptops to 2 days. Thanks,
powdarrmonkey Posted July 28, 2008 Posted July 28, 2008 Set the lease time whenever. Current leases are not affected.
Geoff Posted July 29, 2008 Posted July 29, 2008 Make sure you update your scavanging times to reflect your lease length though.
brahma Posted July 29, 2008 Author Posted July 29, 2008 DNS Scavenging currently set to 7 and 7. I'm gonna set DHCP lease to 8 days.
Geoff Posted July 29, 2008 Posted July 29, 2008 Scavanging will remove valid DNS records if you set things like that.
kingswood Posted July 29, 2008 Posted July 29, 2008 Scavanging will remove valid DNS records if you set things like that. Sure will
brahma Posted July 29, 2008 Author Posted July 29, 2008 Why's that guys? Have I got the numbers round the wrong way? Should I set the DHCP lease to a number below DNS Scavenging then?
SYNACK Posted July 29, 2008 Posted July 29, 2008 Why's that guys? Have I got the numbers round the wrong way? Should I set the DHCP lease to a number below DNS Scavenging then? Yes otherwise the computer will delete leases that are still valid and possibly in use becasue they have not expired yet.
powdarrmonkey Posted July 29, 2008 Posted July 29, 2008 (edited) Yes otherwise the computer will delete leases that are still valid and possibly in use becasue they have not expired yet. Not quite. It will delete the DNS A and PTR records that are associated with leases, not the leases themselves. This means that for a supposedly valid lease, you won't be able to use nslookup on either type of record if it has been scavenged. Scavenging purpose: when DHCP is configured to create the DNS records for you, it doesn't remove them. Scavenging removes records that haven't been updated in the time you give it, so that you don't end up with a million out of date DNS records for machines that have long since moved on. Therefore, your scavenging time should be equal to or greater than your lease time, but for maximum efficiency not more than a day or so. Edited July 29, 2008 by powdarrmonkey
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