A question regarding the db.cache file

Tue Jul 12 06:53:30 UTC 2005

Hi!

I am running a BIND 9.3.0 name server and I am using internal root name 
servers in the db.cache file (as described in "DNS & BIND" 3 ed. page 
390-391).
As I understand it, when BIND first starts up, a very low random RTT value 
is given to each DNS server listed in the db.cache file. This ensures that 
the name server queries all name servers before choosing the nearest. If 
this server, however, becomes unreachable, then another one is selected.

What I would like to know is what triggers the coming back into play of the 
first server (once the fault is removed)?

BR,
Klas

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