Re: [Dnsmasq-discuss] Logging milliseconds//Addendum

[mabra]

Hi !

Many thanks for your investigation !!!

I'll not bother you or anyone in any way, but we may just have
different perspectives to see the problem. I just tell my
opinion about the log - noone should start to patch something.
I am also the type, which waits for distro updates ... to shy to
install from source.

My log-example was mainly to show, that DNSMasq COULD
give a better help through it logs - it was not thought to
explain the problem. That, what you asked to me, exactly
that - so I think - should answer the log ... pobably, one day.

I think, I have good control over my environment and I ensure,
if I make tests like my DNS tests, that the line is not loaded !
The log-example stems just from real-live, were countless apps
are running and different computer are up.  There is, for example,
a RSS reader, which starts batch-loads for a big list of websites - just
to explain, why I do not wonder about the logfile. There is much
more, like over 20 Virusprotection solution, which updates every
hour ...

So I'll start to make a tool, which systematically answers some
(all known open/free DNS in Germany) and measure the overall
response. Will need some time, so. In the meantime, I am using
the DNS from the ISP - anyway what may cause the problem,
if I use the DNS from ISP, I never have problems at all . !!!

If this would not be the case, I really would also suspect
DNSMasq (indirectly), because this runs on a stonehenge
old box, with really no memory free  I see in my syslog,
the Nagios command sometimes fail, due to not enough
memory. This cannot be fixed very fast - too many thing
on my list. But a new firewall machine is already on the
table ...

Thanks again and my best regards,
Manfred

[I hope, this "reply all" will not cause another thread ...]


> -Original Message-
> From: Albert ARIBAUD [mailto:albert.arib...@free.fr]
> Sent: Tuesday, June 21, 2016 8:05 PM
> To: ma...@manfbraun.de
> Cc: dnsmasq-discuss@lists.thekelleys.org.uk
> Subject: Re: [Dnsmasq-discuss] Logging milliseconds//Addendum
> 
> Hi Manfred,
> 
> Le Tue, 21 Jun 2016 17:30:13 +0200
> <ma...@manfbraun.de> a écrit:
> 
> > Hi All !
> >
> > I just changed some free DNS against some other free DNS
> > and now, I have more problems then bevore. Though I'll
> > extend my logging thoughs: In the DNSMasq answer is not
> > visible which of dns provided the answer - that makes diag
> > problematic.
> 
> Seems you started a new thread while I was answering on the previous
> one.
> 
> Short answer: I would suggest that you avoid trying "this and that" as
> well as ad hoc patching", and that you follow a more systematic approach
> to solving your problem, by running tcpdump on the machine which hosts
> your dnsmasq.
> 
> Also, you should really try and make other hypotheses than just your ISP
> messing with DNS. For instance, have you tried to find out how much of
> your uplink bandwidth you're using? Because if your uplink saturates,
> then UDP packets sch as DNS requests might get dropped by your ISP's
> modem.
> 
> > Thanks anyway,
> > Manfred
> 
> Amicalement,
> --
> Albert.



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Re: [Dnsmasq-discuss] Logging milliseconds//Addendum

[Albert ARIBAUD]

Hi Manfred,

Le Tue, 21 Jun 2016 17:30:13 +0200
 a écrit:

> Hi All !
> 
> I just changed some free DNS against some other free DNS
> and now, I have more problems then bevore. Though I'll
> extend my logging thoughs: In the DNSMasq answer is not
> visible which of dns provided the answer - that makes diag
> problematic.

Seems you started a new thread while I was answering on the previous
one.

Short answer: I would suggest that you avoid trying "this and that" as
well as ad hoc patching", and that you follow a more systematic approach
to solving your problem, by running tcpdump on the machine which hosts
your dnsmasq.

Also, you should really try and make other hypotheses than just your ISP
messing with DNS. For instance, have you tried to find out how much of
your uplink bandwidth you're using? Because if your uplink saturates,
then UDP packets sch as DNS requests might get dropped by your ISP's
modem.

> Thanks anyway,
> Manfred

Amicalement,
-- 
Albert.

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