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10.7: Virtual Hosts and multiple web servers
Authored by: leamanc on Oct 13, '11 06:02:56PM
...your external IP address where your web server is located such as 210.55.102.xx (remember this can take up to 48 hours to become live).

Actually, this is controlled by the TTL (time to live) setting on the DNS server that your domain registrar uses. I have dealt with registrars that have had TTL set to something ridiculously high like two weeks! Another one had it set to 60 seconds, which is ridiculously low.

While 48 hours seems to be a common standard, I just thought I'd point out that DNS propagation can take a shorter or longer amount of time than that. Consult your registrar to get a better idea. Of course, client machines can ignore the TTL value (especially if you flush your DNS cache) and go get the new IP regardless. Or refuse to. :-)



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