[olug] Domain name propagation - how long?

[Thom]

I ran some tests:

# host thom.homelinux.com
Host thom.homelinux.com not found: 3(NXDOMAIN)

I then added an entry into dyndns.org and the result instantly came back.

# host thom.homelinux.com
thom.homelinux.com has address 68.13.170.107
#

I then modified it the IP Address to 68.13.170.108 at DynDNS.org and the 
change was essentially instantaneous.

# host thom.homelinux.com
thom.homelinux.com has address 68.13.170.108

# cat /etc/resolv.conf
search eotr.chi.wayport.net
nameserver 65.245.146.129
nameserver 216.12.255.2
#

I then changed /etc/resolv.conf to used the Cox Name Servers and 
recycled the network:

# cat /etc/resolv.conf
nameserver 68.13.16.25
nameserver 68.13.16.30
nameserver 68.12.16.30
search

And once again the .108 IP Address came back.

Changing the IP Address back to .107 resolved immediately using Cox's 
Name Servers too.

Where's the delay?







Ryan O'Rourke wrote:

>On Tue, 2003-10-28 at 16:36, Sean Kelly wrote:
>  
>
>>On Tue, Oct 28, 2003 at 12:59:15PM -0600, Trent Melcher wrote:
>>    
>>
>>>I think they update the root server twice a day everyday. So a registered
>>>domain could start working in no later than 12 hours I believe.  The
>>>propagation does take some time after the root servers are updated, so it
>>>could take 1 -2 days for it to completely propagate, it all depends on how
>>>pepole have their DNS servers configured.  THe quickest I had a domain
>>>actually work was in about 3 hours, but I got it registered just before the
>>>root servers were schedule to do their updates.
>>>      
>>>
>>First off, DNS is not a server-push protocol. When you register a domain,
>>it is not necessary for it to propagate out across the entire internet. In
>>fact, when a client asks a nameserver to resolve 'xyzzy.net', if the
>>nameserver doesn't have it in its cache, it will go to the root servers and
>>ask about it. So, it is only necessary for the root servers to be updated
>>in order for a domain to "start working" on the Internet. There is no one
>>to two day waiting period while things "propagate".
>>    
>>
>
>What about when you change webhosts and have to update your DNS through
>your registrar? Internet DNS servers already have your domain mapped to
>1.2.3.4 - how long does it take after your registrar updates for
>Internet DNS servers to realize that your domain is now mapped to
>5.6.7.8?
>
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>