BIND failure methods (NS)

[LaMont Jones]

mikey78 at my-deja.com wrote:
> If we have 3 NS records (and associated glue A records) at our parent,
> and two of them become unavailable, will resolvers use the one working ?

Other nameservers will tend to use the one with the best round trip time
(RTT).  So, in general, the two down IP's will only be queried every so
often, and the one that's up will get the bulk of the traffic.

> Let's say we have ns1.ourdomain.com, ns2, ns3. Addresses are .1, .2, &
> .3 let's say. So if the BIND server at cnn.com needs to find addresses
> (on the behalf of a client) in ourdomain.com, will it get all 3 NS
> records for ns1,ns2,ns3 from our parent at .com or only 1 ?

The nameserver giving out the referral doesn't care if they're reachable
or not, that's the referred application's problem...

lamont