forwarder's behavior
KyuMin Choi
# The server is RHEL5.4
1. What is the timeout value if a forwarders server specified in
named.conf is down and how many retry
does it do ?
2. If the client makes a query for same FQDN for the second times after
the forwarders server has comes back online,
does this query give up and does not bother asking the forwarders server
as the first query to the forwarders server previoursly
timed out ?
Stephen John Smoogen
> Hello ~ can anyone answer me below questions ?
>
> # The server is RHEL5.4
This should be a bind-9.3.2 server but may be different due to local
updates. The bind version will be more important.
> 1. What is the timeout value if a forwarders server specified in
>
> named.conf is down and how many retry
> does it do ?
The forwarding code in bind-9.3 uses RTT I believe. This would then be
more about how many forwarders there are. If there are multiple then
the code uses a clock to figure out which ones are the fastest and
tries to use those first and slow ones later. If there is only one I
am not sure what happens without looking at the code. A poor guess on
my part would be that it uses the old 3 tries (1 sec, 3 sec 6 sec?)
method.
>
> 2. If the client makes a query for same FQDN for the second times after
> the forwarders server has comes back online,
> does this query give up and does not bother asking the forwarders server
> as the first query to the forwarders server previoursly timed out ?
I would guess it would depend on the number of forwarding servers in
the list. My guess is that if there are multiple ones (say A, B, and
C) and A doesn't answer during the testing period.. it would be the
last one tried in any future attempts. If there is only one.. I would
guess it would try again.
>
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--
Stephen J Smoogen.
Ah, but a man's reach should exceed his grasp. Or what's a heaven for?
-- Robert Browning