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

Danny Mayer mayer at ntp.org
Tue Mar 10 12:14:22 UTC 2009

David J Taylor wrote:
> Martin Burnicki wrote:
>> David J Taylor wrote:
>>> Martin Burnicki wrote:
>>>> However, if several local subnets needed to resolve "microsoft.com"
>>>> then each one would have to ask the root servers the first time.
>>> Wouldn't you have one or two central DNS servers for both subnets?
>> Sorry, I've been not specific enough here.
>> I meant e.g. several companies who have their own local subnets and
>> local DNS servers.
>> If they don't use their ISP's servers then the local DNS server in
>> every company would contact the root DNS servers directly.
>> If they used their ISP's DNS servers then all customers of the same
>> ISP simply get the cached results for popular domains without having
>> to contact the root servers.
>> Of cause all of this discussion is based on assumptions, how much
>> traffic and load on the root servers would differ if people used them
>> rather then their ISP's servers.
>> Martin
> Martin,
> When I was involved in this, some years ago now, each site had its own DNS 
> servers, and those spoke to a central company-wide DNS server.  The 
> connection to the ISP was central, and not per-site.
> I suppose that, like NTP, DNS should be configured to best suit local 
> needs, and try to place minimum load on central servers, although the 
> requirements and resulting configuration may be different.

You can't actually accomplish that, you just increase the load on the
ISP's servers.

> Cheers,
> David 

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