hi

just thought to give a basic explanation of prorogation time...

actually dns prorogation depends on SOA parameters.

not all dns host allow u to modify ur soa parameters......but some do :)


it is Start Of Authority

Refresh in SOA parameter tells the slave nameservers when to chk the master nameserver for any update.

now e.g if ur refresh parameter is 3600 seconds...

and now u just change a dns record........instantly when u change SOA serial no. increases

now e.g if u open/hit ur site in less then one hr.......then it depends........in case u hit Primary server, u will see the new record but in case u hit slave servers then u might see the old records.........


and which dns server u hit depends on MANY reasons like

• which one is nearer....sometime anycast technology is also used
• which one has less load
• which one is accessible in less hopes in the route via ur ISP

but since refresh time is 1hr (in this example...) then u WILL see all changes just after 1hr !!!


so my recomendation to "people in hurry" is better to decrease refresh parameter in SOA to about 1-5mins (chk the minimum ur dns host supports...)

and then do all changes..........and when see all wrking fine after 3-4 days increase those values so as to minimize resource wastage :)


Hope that will be benificial :)

--
Anurag Bhatia
http://anuragbhatia.com

Chief Web Infrastructure Advisor
Granular Linux Project
http://www.granularproject.org
http://www.granularlinux.com