[ntp:questions] http://www.ntp.org/ => a blank page?

Danny Mayer mayer at ntp.org
Tue Mar 10 12:11:17 UTC 2009


Rob wrote:
> Martin Burnicki <martin.burnicki at meinberg.de> wrote:
>> IMHO DNS is not like NTP in the sense that is just *starts* sending queries
>> for domains which have not yet been resolved to the root DNS servers and
>> then are redirected/go on down to the authoritative DNS for that domain,
>> whereas NTP would stuck with the top level servers if they have been
>> configured.
>>
>> However, if several local subnets needed to resolve "microsoft.com" then
>> each one would have to ask the root servers the first time.
>>
>> If you send DNS queries to your ISP's servers then this would save bandwidth
>> since they are normally closer to your network than the root DNS servers,
> 
> Also don't forget that it will save time too, when you are on a connection
> with some roundtriptime.
> 
> When you use the ISP forwarder, you make a single request to the forwarder,
> which will make the multiple requests required to do the lookup, presumably
> over a faster connection than you have yourself.  It will then send a single
> reply with the results.
> 
> When you go to the root server yourself, you have to do multiple queries
> over the slower connection, which takes more time.

Have you ever tested this? Tests show that this is almost never the case
and the time saved is so small you will never notice the difference.

Danny

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