[Dnsmasq-discuss] Mac client constant reverse query on itself

Rune Kock rune.kock at gmail.com
Wed Feb 25 20:29:50 GMT 2009


On Wed, Feb 25, 2009 at 20:50, Bob Davis <bluecar at volcanomail.com> wrote:
> Looks like I had a formatting problem on my previous post.  Let's try this again.
>
> I'm running 2.46 on Tomato serving up DNS and DHCP to a mix of PC's, NAS's and a Mac.  Everything is working great but I'm puzzled by the behavior of the Mac client (10.5.6).  Every 10-15 seconds the Mac performs a reverse DNS query on it's own address.  As far as I can tell, DNSMASQ seems to reply correctly with the host name but then 15 seconds later it queries again.  Not sure if this has to to with Bonjour or not.  IPV6 is turned off on the Mac.  Here's a copy of the parameters to DNSMASQ:
>
> dhcp-authoritative
> bogus-priv
> all-servers
> filterwin2k
> domain-needed
> domain=localhost
> cache-size=8192
> log-dhcp
> log-queries
> log-async
> log-facility=/var/log/dnsmasq
>
> Here's what the log entries look like:
>
> Feb 23 21:17:11 dnsmasq[1724]: query[PTR] 101.0.168.192.in-addr.arpa from 192.168.0.101
> Feb 23 21:17:11 dnsmasq[1724]: DHCP 192.168.0.101 is iMac1.localhost
> Feb 23 21:17:24 dnsmasq[1724]: query[PTR] 101.0.168.192.in-addr.arpa from 192.168.0.101
> Feb 23 21:17:24 dnsmasq[1724]: DHCP 192.168.0.101 is iMac1.localhost
> Feb 23 21:17:36 dnsmasq[1724]: query[PTR] 101.0.168.192.in-addr.arpa from 192.168.0.101
> Feb 23 21:17:36 dnsmasq[1724]: DHCP 192.168.0.101 is iMac1.localhost
> Feb 23 21:17:48 dnsmasq[1724]: query[PTR] 101.0.168.192.in-addr.arpa from 192.168.0.101
> Feb 23 21:17:48 dnsmasq[1724]: DHCP 192.168.0.101 is iMac1.localhost
> Feb 23 21:18:01 dnsmasq[1724]: query[PTR] 101.0.168.192.in-addr.arpa from 192.168.0.101
> Feb 23 21:18:01 dnsmasq[1724]: DHCP 192.168.0.101 is iMac1.localhost
> Feb 23 21:18:14 dnsmasq[1724]: query[PTR] 101.0.168.192.in-addr.arpa from 192.168.0.101
> Feb 23 21:18:14 dnsmasq[1724]: DHCP 192.168.0.101 is iMac1.localhost
> Feb 23 21:18:26 dnsmasq[1724]: query[PTR] 101.0.168.192.in-addr.arpa from 192.168.0.101
> Feb 23 21:18:26 dnsmasq[1724]: DHCP 192.168.0.101 is iMac1.localhost
> Feb 23 21:18:38 dnsmasq[1724]: query[PTR] 101.0.168.192.in-addr.arpa from 192.168.0.101
> Feb 23 21:18:38 dnsmasq[1724]: DHCP 192.168.0.101 is iMac1.localhost


Setting the local-ttl option might help.  In any case, I don't think
you need to be concerned about this behaviour, unless the bandwidth
between the mac and the dnsmasq-machine is critically low.


Rune



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