Thread: DNS Help needed
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Old 09-22-2007, 07:44 PM  
ne0
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Join Date: May 2006
Location: brazil
Posts: 781
Quote:
Originally Posted by mikesouth View Post
ok tech question here TIA for help

Im moving to a new hosting company and am migrating my sites to the new server

when I am done how can I keep both sites up heres my idea but I dont know if it works...the goal is to keep both sites live until propagation happens fully

can I change the DNS info at the registrar so that I use

ns1.oldhosting.com
ns2.newhosting.com

and let that propagate for say 3 days then change it to

ns1.newhosting.com
ns2.newhosting.com

or am I going about this the wrong way and if so how do I avoid a site being unreachable during propagation?
if both servers are up during all the move there should be no downtime.
Also, the whole concept of propagation is kind of past now, with higher speeds and high processing power nowadays it's not every isp that has DNS caching servers, making everything faster.
So once you have made the change, it should come up almost instantly, as soon as you update the values, you just need to be sure that you don't have the site cached on your own machine.
To flush your DNS cache (using windows) you do open the command prompt and run:
Code:
ipconfig /flushdns
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