Bind TTL changes

["Tony Heal" <theal@pace2020.com>]

I have a DNS server (Debian woody, bind v8.3.3-2.0woody2) that I need to move. It has been suggested that I change the TTL to an hour so that all name servers with anything cached will expire during the physical move of my server. Thus reducing my downtime to the time it take to move the computer hosting DNS.

 

I am a little confused about what needs to be set. I would like the cache to expire in 1 hour, so I think I need to change (see  below) refresh to 1800, expire to 3600. Is this correct?

 

 

@       IN      SOA dns.mydomain.com. postmaster.mydomain.com. (
                        2005110200   ; serial number
                        3600         ; refresh
                        300          ; retry
                        86400        ; expire
                        900        ) ; minimum TTL

 

Tony Heal

Pace Systems Group, Inc.

800-624-5999

theal@pace2020.com