TTL & Scavenging

[Rich Magowan]

Hi,
Can somone tell me how to read the TTL info on the zone
record? I see 0 :1 :0 :0 meaning what? 1 day, 1 hour??
Also the refresh, retry, expire intervals. Are the
defaults adequate?
I want to turn on scavenging again to help with my reverse
look-up zones. Every time I've used scavenging I've had
problem with records disappearing that I didn't want to
have go away. Is there a good MS White paper or other
resource I can read to help better configure the DNS
Service?

Thanks for any advise.

 

[Ace Fekay [MVP]]

In

Hey Rich,

0 :1 :0 :0 means one day.

but this is what you will see by defualt.
to turn on scavanging you have to turn it on at the server level.

Under the properties of the server name in the dns console select the
advanced tab and enable automatic scavanging of stale records by
defualt that value is 7 days.

Then you have to consider the no-refreash interval and the refreach
interval under the server aging/scavanging properties.

Hope that helps a little

George

When clicking on the "?" in the corner and then clicking in the TTL field,
you get this message:

Displays the minimum default Time-To-Live (TTL) interval, supplied along
with the data by a DNS name server when it responds to a DNS query. The TTL
interval indicates how long the receiving name server is allowed to cache
the data from the query. When you create a new DNS zone, the default value
is 60 minutes.

So
0 :1 :0 :0
should mean 60 minutes.

I have all my zones at:
1 :0 :0 :0
for one day.

Just to confirm, when you select Advanced view, then properties of a record,
and do the same with the question mark, it specifically states each field:

Provides a space for you to type a new Time-To-Live (TTL) value for this
host (A) resource record. The TTL is used by other DNS name servers and some
DNS clients to determine how long they are allowed to cache information,
returned from DNS, about this computer or network device. The format of the
time typed should be in days (DDDDDD), hours (HH), minutes (MM), and seconds
(SS).

More info:
HOW TO: Modify Time to Live on Domain Name System Records
http://support.microsoft.com/default.aspx?scid=kb;en-us;297510



--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory