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rowan · 12-08-2007, 04:36 PM

GrouchyAdmin hinted at what you need to do in order to have a near instant change: set the TTL low. The TTL (Time To Live) field controls how long a DNS record can be cached at an intermediate point (such as your ISP's DNS cache) before it is discarded and queried again from the DNS server(s) for that domain. This is why it takes so long for some people to see the changes, since something closer to them has cached the DNS record.

If you set your TTL to something low like 2 minutes well in advance (ie, at least 24-48 hours ahead of the IP change) then the majority of your surfers will switch over very quickly as the records are not cached for long. Don't forget to change the TTL back to a more reasonable level after the switch.

12-08-2007, 04:36 PM
rowan Too lazy to set a custom title Join Date: Mar 2002 Location: Australia Posts: 17,393	GrouchyAdmin hinted at what you need to do in order to have a near instant change: set the TTL low. The TTL (Time To Live) field controls how long a DNS record can be cached at an intermediate point (such as your ISP's DNS cache) before it is discarded and queried again from the DNS server(s) for that domain. This is why it takes so long for some people to see the changes, since something closer to them has cached the DNS record. If you set your TTL to something low like 2 minutes well in advance (ie, at least 24-48 hours ahead of the IP change) then the majority of your surfers will switch over very quickly as the records are not cached for long. Don't forget to change the TTL back to a more reasonable level after the switch.