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Well I just completed my second move of IP addresses in the past year or so. I switched over at ~2pm Sunday Afternoon and google has already been hitting my new IP hard today (Monday) so it really looks like this is a non issue.
In preperation I reduced the DNS TTL's to 10min for a couple days in advance. I also did not do any type of port or ip forwarding. The old IPs are now dead.
It looks like google is quite quick on refreshing it's DNS cache and it doesn't seem like there is anything to worry about.
It seems that they update their DNS cache much more frequently now.
When GG had both "deep bot" and "fresh bot" I used to wait until I noticed the deep bot crawls in my new logs before I'd feel comfortable taking down the old site. Now that we only have one brand of bot, it cuts down on the waiting time.
The last time I made a DNS change GG had it within two days.
mcavic - It's really nice if you can be running DNS on the new DNS servers in advance. In my situation I was moving my phisical box so I had my DNS up an running at the destination. Right as I took my box down I changed all the IPs in DNS to the new home. That way on my drive over to my new location the 10min was expiring so by the time I turned me box on everything was already pointing to the new IPs. Everything went smooth and my total downtime was only 25min.
Today, several months later, there is still 20000 pages of the old url in the index and just 10000 pages of the new url.