I just encountered into something interesting. Before, when I was changing nameservers with the registrar for a domain, the domain was always able to resolve either to the old nameservers (that are still active) or, after a while, to the new name servers. I never encountered a site to be down where both old and new nameservers are active.
However, I recently made a change of nameservers for a .net domain. After 4 hours, I was able to resolve to the new server with the new nameservers. However, I discovered 50% of other places simply could not reach the site at all (unknown host).
Is there a change in the propagation process or what is causing this? I tested it also with alertra and it showed the same thing, half locations saw it and half did not.
Yes it has changed quite a bit. I have seen it happen in less than 5 minutes using Network Solutions. A client in the midwest changes DNS and within 5 minutes he was hitting our servers and I was as well with the domain name.
Thanks for the replies everyone but I think you misunderstood my question. I am aware of the speedy propagation time. My question is regarding why is there downtime when changing nameservers for an active site when both old and new server is online and functioning fine.
Before, when changing nameservers, the site would resolve to the old server or the new one, but would never be down. However, yesterday I noticed that some locations would simply not resolve it at all.
If you are referring to changing the Nameserver IPs there should not be any downtime if both Servers are online. This presumes that no changes were made on the old Server. (i.e. deleting Reseller and/or Client accounts before confirming propagation)
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Originally posted by Website Rob If you are referring to changing the Nameserver IPs there should not be any downtime if both Servers are online. This presumes that no changes were made on the old Server. (i.e. deleting Reseller and/or Client accounts before confirming propagation)
I changed a domain form NS1.OLD-HOST.COM to NS1.NEW-HOST.COM both of teh servers (old and new) are active and working but when I chnaged the nameserver to the NS1.NEW-HOST.COM, many places across the wrold could not get to either the old server or the new one.
I did this many times before and never had downtime. This is why it is odd as I have not seen this happen before.
In fact, Verisign implemented a new feature into their Naming and Directory Services (VNDS) in September, 2004, that updates the major TLD zones much more often than it did before. Therefore, you should have faster propagation times, rather than slower ones, as you are describing.