[olug] Domain name propagation - how long?

[Sam Tetherow]

There isn't one because the DNS servers you used properly handled the 
TTL on the domain which with the dynamic dns domains is set to 
effectively no cacheing due to the nature of the domain.

There are misbehaving DNS servers which don't honor the TLL and hence 
will serve up cached results longer than they should have.  There is 
also the instance in which you have a TTL set to something higher 3 days 
is not unheard of although most people set it much lower).  In which 
case it is possible for the propogation to take that long since the 
worse case scenario would be someone resolved the host immediatly prior 
to you updating the DNS.

Thom wrote:
> 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?
>>
>> _______________________________________________
>> OLUG mailing list
>> OLUG at olug.org
>> http://lists.olug.org/mailman/listinfo/olug
>>
>>  
>>
> 
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> 


-- 
------------------------------------------------------------------------
Sam Tetherow                           tetherow at nicusa.com
Director of Development
NIC Labs (PSSG)                        http://www.nicusa.com