Move a site without updating name servers Options

[S3]

I need to move a site today to a new server. I don't have easy, quick access to the site's name server. It could take a week or more to get that zone updated with the new IP. I need for all http, ftp, mail, etc requests to serverA to be magically redirected to serverB, seamlessly. The site is not high traffic. Sometimes no users for hours, othertimes maybe a few simultaneous users. It is important though for all of this to be invisible so that my client is not inconvenienced and no mail or files are lost. I've seen a couple of ideas using IP forwarding and DNS forwarding, but it sails right over my head. Is there any simple way to do this?

[ChuFuong]

I need to move a site today to a new server. I don't have easy, quick access to the site's name server. It could take a week or more to get that zone updated with the new IP. I need for all http, ftp, mail, etc requests to serverA to be magically redirected to serverB, seamlessly. The site is not high traffic. Sometimes no users for hours, othertimes maybe a few simultaneous users. It is important though for all of this to be invisible so that my client is not inconvenienced and no mail or files are lost. I've seen a couple of ideas using IP forwarding and DNS forwarding, but it sails right over my head. Is there any simple way to do this?

you can IP forward, but wouldn't that double the bandwidth? I don't think there is a GOOD way around changing the DNS... looks like your best option is just to notify everyone of the expected downtime and go with it and get it over with. DNS changes really just depend on the registrar or wherever it's controlled... Mine usually completely resolve in 10 minutes, 2 hours was the longest one ever took for me anywhere.

[S3]

Thanks for your reply. I ended up using IP forwarding I found in an old thread at WHT. It worked great for my particular circumstances and gives me time to get the nameservers updated.