[KLUG Members] domain DNS help

[Bruce Smith]

> > After the 72 hours refresh time they speak of will changes I make to my
> > domain records take effect right away.  In other words will I be able to
> > view in web browser www.nighthawk-tech.com.
> 
> Yes. DNS record updates can be immediate, but the DNS root server
> registries take a few days to propagate. Once they do, however, the
> effect, assuming all info is correct, should be immediate.

Not exactly.  

The root server propagate time delay is only after you change or add a
new entry with your registrar.  (add a new domain, change DNS servers)

Changes that you make in the DNS server itself _can_ take as long as the
TTL (time to live) in your DNS records.  (sometimes sooner, depending if
the DNS server being used has the entry cached, or not)

I set the TTL low if I need quicker updates (like if I'm going to change
the IP of a server).  I set it longer otherwise to conserve bandwidth.

The O'Reilly DNS book is highly recommended.
 
--------------------------------------------
Bruce Smith                bruce@armintl.com
System Administrator / Network Administrator
Armstrong International, Inc.
Three Rivers, Michigan  49093  USA
http://www.armstrong-intl.com/
--------------------------------------------