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freethought · 2nd July 2008

From my experience, it completely depends on the software doing the DNS lookup. Some software picks one at random and sticks with it, some does it round robin and some just always uses the first server in the list (unless it isn't working).
If a record is returned, that that gets used but if the server returns NXDOMAIN, SERVFAIL or just plain doesn't do anything (timeout) then the next one is used.

2nd July 2008	#4 (permalink)
freethought I am Staff at Freethought Group Limited About My Company! Certified Host Join Date: Aug 2007 Location: Lincoln, UK Posts: 591	From my experience, it completely depends on the software doing the DNS lookup. Some software picks one at random and sticks with it, some does it round robin and some just always uses the first server in the list (unless it isn't working). If a record is returned, that that gets used but if the server returns NXDOMAIN, SERVFAIL or just plain doesn't do anything (timeout) then the next one is used. __________________ Freethought Group Limited Hosting and communications Freethought Group Limited registered in London No. 5862996. Registered office: The Old Church Hall, 2A Cromwell Street, Lincoln, LN2 5LP. Xion Internet and Freethought Internet are trading names of Freethought Group Limited. __________________ Web Host - Certified Member