forwarders are unreachable -> lookup fails?
jim at rfc1035.com
Wed Mar 21 17:33:48 UTC 2001
>>>>> "Brad" == Brad Knowles <brad.knowles at skynet.be> writes:
Brad> The moral to this story is that you want to make
Brad> absolutely, positively, certain that the servers you are
Brad> forwarding queries to are always up and operational.
Brad> Otherwise, you shouldn't be forwarding queries to them.
Another moral is don't forward if at all possible. Forwarding is evil.
Unfortunately it is a necessary evil in some circumstances. Using
forwarding to build up a huge cache on one central name server is not
a valid justification for forwarding in my opinion.
Brad> That said, I believe that BINDv9 is more intelligent
Brad> about detecting and remembering when forwarding servers are
Brad> down/slow (using the same algorithms formerly used to
Brad> determine how fast various remote nameservers are for
Brad> various zones, such as the root and TLD zones)
Correct. The same thing is done in 8.2.3 too. From the CHANGES file:
997. [support] forwarders are now used in order by measured RTT.
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