I have dnsmasq running on a RaspberryPi using the Arch Linux ARM
distribution, implementing both dhcp and dns functionality (tftp is
handled by a different server).
I have been experiencing extremely slow browsing performance - as an
example, a 'first' google search takes, typically, 20 seconds to display
the results page - the slowest I've recorded has been 30 seconds.
Subsequent google searches complete within 2 seconds.
I have been complaining to my ISP for almost two months, blaming them
for poor network performance, but they always reply that there are no
issues on their network apart from some possible local contention
issues. However, even in the middle of the night, when speedtest is
reporting 25Mbps down/15Mbps up, a google search can still take 20
seconds or more.
The odd thing is that on a few occasions the network performance is
perfect, when google results are always returned within 2 seconds - this
happened last Tuesday, between the hours of 3am and 6pm.
Now I think that it might be 'egg-on-face' time because I'm beginning to
think that my performance issues are being caused by my use of dnsmasq
as my local dns server/relay.
My reasons for coming to this conclusion are based on some
experimentation with dig.
If I dig an address directly at my ISP's dns server, it will, typically,
report a query time of 500ms. Repeating the query immediately will
report a query time of around 50ms.
Performing the same, or similar, queries vis my dnsmasq server will
often report a query time of 3 or four seconds, while an immediate
repeat will report a query time of 0 or 1ms. Similarly, queries for
locally defined addresses, will report 0ms query times.
My conclusion from these tests is that dnsmasq takes an inordinately
long time to return a query for an address that is neither in its cache,
nor, possibly, in the ISP's dns server cache.
Unless this is a well-recognised phenomenon, I guess that I need to
enable dns logging within dnsmasq and study the output - what should I
expect to see in the log and what should I be looking for?
--
-------------------------------------------------------------------
Peter Bell Mob: +63 (0) 9287 340 343
Tagum City, Philippines. Tel: +63 (0) 84 216 9037
email/msn: [email protected] Tel: +63 (0) 84 308 0002
_______________________________________________
Dnsmasq-discuss mailing list
[email protected]
http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
