[olug] DNS: dropping to secondary when primary doesn't respond

[Dave Thacker]

I have three DNS servers providing internal (inside the firewall) DNS.   All 
servers on the network have entries by ip address for these three servers 
in /etc/resolv.conf.   My question is:

1) If the first server in the list can't be reached at all, how fast does the 
request time out and move to the second server.  

2)If the first server will accept the request, but is slow in providing an 
answer, how fast does the request time out and move to the second server?

3)  Is that interval tunable?

DT