SV: Caching DNS

Ø  What we really need at this point is an accurate definition of the problem.  


Yes, I can strongly agree.



Ø  DNS servers and clients do not refresh (effectively cache) a fetched DNS record until the TTL (time to live) for the record expires.   The TTL is defined by the DNS administrator for the domain in question.  If their server cannot handle the load then maybe they need to extend the TTL for their records.  I think a "Caching DNS" violates the RFC for Domain Name Servers.

 

I don’t think one should refer RFC:s flr Domain Name Servers… The traditional reference for the DNS is “DNS and BIND” by Cricket Liu and Paul Albitz <http://www.oreilly.com/pub/pr/1590>  but maybe the Microsoft had some influence on the DNS in the past. I haven’t been so very close to the DNS evolvement in the last 10 years. But DNS is still fundamental for the Internet and the IPv4 as well as IPv6. However, I am retired since some years,

I can recommend the following readings regarding DNS: 

Name Server: https://en.wikipedia.org/wiki/Name_server (Wikipedia)

Adding a Caching-Only DNS Server: https://technet.microsoft.com/en-us/library/cc794916%28v=ws.10%29.aspx (Microsoft Technet) 

However, we need an accurate definition of the problem otherwise the discussion would be meaningless. 

 

Från: [email protected] [mailto:[email protected]] 
Skickat: den 28 oktober 2016 19:06
Till: [email protected]
Ämne: Re: [blat] Caching DNS

 

  

 

What we really need at this point is an accurate definition of the problem.  

 

DNS servers and clients do not refresh (effectively cache) a fetched DNS record until the TTL (time to live) for the record expires.   The TTL is defined by the DNS administrator for the domain in question.  If their server cannot handle the load then maybe they need to extend the TTL for their records.  I think a "Caching DNS" violates the RFC for Domain Name Servers.

 

Stuart