On 22.06.2005, at 00:01, Linkas wrote:
Andreas Fink wrote:
On 21.06.2005, at 14:48, Julien Buratto wrote:
I've started kannel on linux redhat 9
smsbox is calling HTTP dlr urls resolvin ok
I edited the /etc/resolv.conf and changed the ip address of the
dns server
resolving ok on the linux side
disabled old dns server
resolving ok on the linux side
kannel not resolving correctly
restarted kannel, now resolving ok.
Strange, it seems like a resolver in cache...
J
This is usually the case on most operating systems.
If you once resolved a IP it will stay in cache for a while.
Andreas Fink
This is not the case, I'm talking about another dns server changed
in the resolv.conf file, so no cached was possible.
In the case of a cached dns value, the kannel had to keep on
resolving correcly with the cached value; in this case the server
itself was resolving correcly on the operating system level with
the new dns server, so I presume some memory pointer is not garbage-
collected correcly.
The kannel has been ip almost 20 hours before being restarted. The
target domain was the same between the two dlr-url.
You haver to distinguish DNS Server cache and DNS client cache.
Even while chaning resolv.conf to drop out a DNS Server from your
query queue, it might be that your CLIENT cache still resolve to
whatever it resolved before. This means your client (kannel in this
example) will not query the net for the IP it already resolved a
while ago. Its implementation specific but whatever library you use
to resolve DNS might do that. I dont think thats something kannel
does by itself but the resolver library it uses which is provided by
the operating system. Killing and restarting kannel then makes this
cache being lost, resulting in another query next time at what point
the resolv.conf is queried again.
At least this is the behaviour I have seen with other apps in the
past on various unix systems.
Andreas Fink
Fink Consulting GmbH
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