:: >So, if you, or the original poster, is going to move :: ${important_resource} :: >around ip-wise keep in mind that your ${important_thing} may have to :: >answer to more than 1 ip address for a period much longer than your :: tuned :: >TTL :( :: :: Thanks all for the responses. I do understand we may need to support the :: old IP addresses for sometime. I was hoping someone had performed a :: study out there to determine what a ratio maybe for us supporting an old :: IP address (I know our traffic profile will be unique for us thus it :: would only give us a general idea). :: :: For example if we change ip addresses will we need to plan on 20% :: traffic at old site on day1, 10% day2, 5%, day3, and so on...? There are :: also issues related to proxy servers and browser caching that are :: independent of DNS we will need to quantify to understand full risk. The :: more data we have will drive some of our decisions. In my not-so-scientific "studies" with changind IPs for a fairly large volume site, I found that 90% of the people will use the new ip within an hour of TTL expiration, 99.999% of the people within 3 days, and that remaining .001% may take years.... As someone said earlier, some parts of the 'net are just broken beyond your control... -igor