Agreeing with Brian-your DNS scavenging sounds too aggressive. This is a good read: http://blogs.technet.com/networking/archive/2008/03/19/don-t-be-afraid-of-dns-scavenging-just-be-patient.aspx
"The second is when a record gets created by a client machine registering using dynamic DNS. Windows clients will attempt to dynamically update DNS every 24 hours." -Bonnie From: Brian Desmond [mailto:[email protected]] Sent: Monday, March 30, 2009 9:29 AM To: NT System Admin Issues Subject: RE: DNS Woes Your servers which I assume aren't using DHCP aren't refreshing their DNS records that frequently. I don't know what the default interval is offhand in Windows. 4 hours for DHCP is fine but for DNS scavenging that is awfully aggressive. Why not just set it to a week? Thanks, Brian Desmond [email protected] c - 312.731.3132 From: Jeremy Anderson [mailto:[email protected]] Sent: Monday, March 30, 2009 11:12 AM To: NT System Admin Issues Subject: DNS Woes All, I am having some serious issues with DNS and scavenging in my domain. The problem is that server A records are being scavenged. Here is the background. About 400 windows machined, 300 Linux machines, and 80 Macs. All the windows boxes are in the domain, 4 domain controllers provide DNS for the Windows and Mac clients. DHCP is done by a linux server. Currently the DHCP lease is 4 hours. I have not been successful so far in getting this extended. I set the Scavenging period on one server on DC1 to 5 hours. On my zone I set the No-refresh to 3 hours and the refresh to 4 hours. I checked the server after 4 hours and of course all my server A records were deleted. I manually recreated the records and Ensured that the "delete this record when it becomes stale" is NOT checked. I checked the DNS server again 4 hours later, another scavenging cycle had run, and not only had half the server records been deleted, but a couple now had the box checked to "delete this record when it becomes stale" Typing this out I realize that I probably should have set the Scavenging Period to 7 hours not 4 (4+3=7). I need to get this working properly and not have my server records scavenged. I can discuss extending the DHCP lease time, but I need concrete reasons as to why, instead of "its breaking my dns" Why does the box keep getting checked on the servers A record to be deleted when its stale. Sorry for all the Deep thoughts on a Monday. Thanks for the advice on this issue. Jeremy ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
