Matt Cutts: Okay. You want to know about moving to a new IP address, or moving to new domain name?
Q: Both. Matt Cutts: All right. Here we go. IP address is easier, so let’s do that first. You have an old site at an old IP address. You bring up the same site at the new IP address, right? And the whole idea of that is no matter which IP address you go to, you’ll still get the exact same site. So you want to mirror or duplicate across IP addresses. Before you even do that, there’s something in DNS, the Domain Name System, whenever I type in ‘Google.com’ or ‘WebMasterWorld.com’ or ‘Pubcon.com’, there’s a Domain Name Resolver that says, ‘Okay, the IP address for Pubcon.com is right here.’ And normally you say, ‘Okay that’s cached for 24 hours, so if I search for Pubcom.com again, I’ll go straight to that IP address.’ I don’t recheck for another 24 hours. There’s a setting called ‘TTL’ which stands for Time To Live. So you can set your DNS TTL or Time To Live to five minutes. And if you do that, then every five minutes, if you type in Pubcon.com, it’ll just recheck for the new IP address
