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I was going to use a similar domain name i got but some of the pages have been under the main domain for 3 years and I'm concerned about duplicate content and the PageRank of the main domain.
If you're a very busy site and want to minimise the load on your authoritative DNS, you can use a binary chop.
Let's say your current TTL is 4 days. This means that a DNS server anywhere on the Internet can cache your IP address for up to that time. Then, if you're planning an IP change over, you must go in to your SOA record at least 4 days in advance and make the value 2 days. Then 1 day, then 12 hours, then 6 hours, etc. etc. as much as you can be bothered. When you get bored, go to 0 (zero). As long as you do this, then by the time of the change over every DNS lookup will be coming through to your authoritative server.
As soon as you've changed IP you can then return to the original TTL value.
If you're not fussed (or you don't like your DNS provider), you can just bring the TTL down to zero 4 days out. It will have the same effect, it's just that during that week a lot more traffic will be heading for your authoritative DNS.
Hope this helps.
The only way really is to watch those logs very carefully!
As soon as you see G hit the new IP turn off the old. I had no trouble when I did it but it pays to be safe right?
You could, if you can script, set up a program to notify you the minute G is seen...