caching question

David Botham DBotham at
Thu Oct 21 13:30:35 UTC 2004

bind-users-bounce at wrote on 10/21/2004 05:11:39 AM:
> Hello,
> as far as I know, when secondary nameserver asks primary if his zone is 
> up-to-date, it just checks for serial number. What about 
> non-authoritative (caching) nameserver?

And to be clear on one issue, caching name server do not transfer zones. 
The only data they get from other name servers is discovered through the 
resolution process.  The other posts on this problem describe how bind 
uses TTLs...



> I have a customer that argued that our DNS server had wrong data for his 

> zone. It turned out that the customer forgot to increase serial number. 
> How BIND acts in this case?
> Thanks!
> -- 
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> Pavel Urban (pavel.urban at
> IOL system disaster
> Internet OnLine, owned by Cesky Telecom, a.s. (
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