Re: [opensuse] dns too slow?
- From: Arun Khan <knura9@xxxxxxxxx>
- Date: Fri, 26 Feb 2010 10:53:59 +0530
On Fri, Feb 26, 2010 at 2:48 AM, Leen de Braal <ldb@xxxxxxxx> wrote:
Hi all,
Having some troubles with dns. Sometimes when sending mail it is not
possible to resolve the addressee's domain. When checking manualy with
dig, the domain will be shown. I have been checking this, when trying
another domain (from which I am quite sure it will not be cached) I can
see that the MX record is not resolved by the local server. When checking
again, it gives the right answer.
Could this be some time-out that is set too short, and is there a way to
make it wait a little longer, or check the second nameserver in
resolv.conf (which is the one from the ISP) before the time-out?
Config as follows:
- openSUSE 11.2 does routing, firewall, and named.
- openSUSE 11.1 does mail, and checks the nameserver on 11.2.
I have seen this happen, with DNS queries, when I fire up workstations
(including the server hosting named) the first thing in the morning.
I do boot the server first and when it comes online, I boot the
workstations.
The DLink DSL router chokes on too many simultaneous requests. I
know this for sure because ping requests to external hosts (via IP
numbers) also time out.
Everything settles down after a couple of minutes though.
I suggest you make sure that you do not have any network bottle necks,
before suspecting your internal DNS server. You can use tcdump,
wireshark etc. to monitor network traffic.
HTH
-- Arun Khan
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