Have 3 default gateways, but which DNS servers do I use in DNS forwarders section of local DNS server?

I have several internet lines, 2 T1's, and one DSL line.  Each of course comes with 2 DNS (primary and secondary) servers provided by each respective ISP.  My question is, should i put all 6 DNS address in my DNS server's forwarders property?  Or should i put the two closest/fastest ones in there?  Also how do i find out which of these DNS servers respond the fastest to queries?  Thanks!
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reb_elmagnificoConnect With a Mentor Commented:
You can simply ping each one of them.  Check the response times and order the forwarders appropriately...fastest response time is 1st, 2nd fastest is 2nd, etc.  You can add all of them, but just know that the first one will be used 95% of the time.

Hope this helps.

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