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Weird DNS queries on waking up

Message #1 - Posted 2006/11/26 - Steven Myers

My dual 1.8 GHz G5 Powermac tends to issue strange DNS queries when it wakes from sleep. It requests things such as:

2.1.168.192.in-addr.arpa 1.0.0.127.dnsbugtest.1.0.0.127.in-addr.arpa lb._dns-sd._udp.home
dr._dns-sd._udp.home
r._dns-sd._udp.home

Some explanation of my network: the mac is at 192.168.1.2, so the first query contains its IP address in reverse with ".in-addr.arpa" appended; similarly, the second contains the localhost address in reverse. The ".home" domain is a fake domain used within my LAN for some applications which insist on having a fully qualified domain name.

The reason these strange DNS queries irritate me is that I'm on dialup using dial-on-demand; these requests trigger the modem to dial out when I don't want it to. Queries with things like "dnsbugtest" in them suggest this is something which could be turned off. Does anyone know how? Barring that, does anyone know why my mac makes these queries?

The mac is currently running 10.4.8, but this behavior has existed from the beginning, running several iterations of 10.4 (I think 10.4.2 through .8). I particularly notice it when it wakes from sleep, but I suspect it happens at other times, as I occasionally notice inexplicable dialouts (the modem sends a growl notification when it connects and disconnects).

Thanks.

Steven Myers
smyers (at) sonic (dot) net

Message #2 - Posted 2006/11/27 - matt neuburg

Steven Myers wrote:

The reason these strange DNS queries irritate me is that I'm on dialup using dial-on-demand; these requests trigger the modem to dial out when I don't want it to. Queries with things like "dnsbugtest" in them suggest this is something which could be turned off. Does anyone know how? Barring that, does anyone know why my mac makes these queries?

It sounds llke you've misconfigured your Location. Go into Network Preferences and study your Location and make sure all is well. In Network Port Configurations completely disable whatever you aren't using, so that only the modem is enabled. m.

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Message #3 - Posted 2006/11/26 - Steven Myers

On 2006-11-26 18:06:20 -0800, matt neuburg said:

Steven Myers wrote:

The reason these strange DNS queries irritate me is that I'm on dialup using dial-on-demand; these requests trigger the modem to dial out when I don't want it to. Queries with things like "dnsbugtest" in them suggest this is something which could be turned off. Does anyone know how? Barring that, does anyone know why my mac makes these queries?

It sounds llke you've misconfigured your Location. Go into Network Preferences and study your Location and make sure all is well. In Network Port Configurations completely disable whatever you aren't using, so that only the modem is enabled. m.

All appears well in my network configuration. One point which I did not make clear enough in my original post: the dial-on-demand modem is not connected to my mac; it is a separate device on the network. Network Preferences is set to use the built-in gigabit adapter. The mac's IP address, subnet mask, gateway, and DNS settings are all correct and functional.

Also, I have a rather odd network, since I have 6 computers on a gigabit lan which share the dial-on-demand modem. Everything works fine (and has since before I got my mac) with all the machines, except the mac generates these weird DNS queries.

Steven Myers
smyers (at) sonic (dot) net

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