Ubuntu Sverige

Rune.K skrev:Jag vet att cachade DNSuppslagningar ställer till det ibland om en URL har fått ett nytt IP-nummer.
Hur DNS fungerar vet jag i stora drag hur det fungerar.

Men hur DNScachen fungerar, har jag väldigt lite hum om.
Brukar starta om router och dator för att lösa eventuella problem...

Tacksam för lite länkar med mera om hur DNScachen fungerar.
/Rune

Recursive and caching name server
In principle, authoritative name servers are sufficient for the operation of the Internet. However, with only authoritative name servers operating, every DNS query must start with recursive queries at the root zone of the Domain Name System and each user system must implement resolver software capable of recursive operation.
To improve efficiency, reduce DNS traffic across the Internet, and increase performance in end-user applications, the Domain Name System supports DNS cache servers which store DNS query results for a period of time determined in the configuration (time-to-live) of the domain name record in question. Typically, such caching DNS servers, also called DNS caches, also implement the recursive algorithm necessary to resolve a given name starting with the DNS root through to the authoritative name servers of the queried domain. With this function implemented in the name server, user applications gain efficiency in design and operation.
The combination of DNS caching and recursive functions in a name server is not mandatory, the functions can be implemented independently in servers for special purposes.
Internet service providers typically provide recursive and caching name servers for their customers. In addition, many home networking routers implement DNS caches and recursors to improve efficiency in the local network.