[Dnsmasq-discuss] Clients bypassing dnsmasq server intermittently

Don Muller don at djmuller.com
Tue Sep 28 23:48:31 BST 2010


Do you have any dns servers hardcoded on your macbook?

> -----Original Message-----
> From: dnsmasq-discuss-bounces at lists.thekelleys.org.uk [mailto:dnsmasq-
> discuss-bounces at lists.thekelleys.org.uk] On Behalf Of guy at desgames.com
> Sent: Tuesday, September 28, 2010 5:14 PM
> To: dnsmasq-discuss at lists.thekelleys.org.uk
> Subject: [Dnsmasq-discuss] Clients bypassing dnsmasq server
> intermittently
> 
> I recently set up dnsmasq on an office server and have successfully
> configured it to act as an office DNS server. So far it seems to work
> fine, the only problem being that after a while my specific computer
> (a macbook with OSX 10.6) sometimes starts bypassing the dnsmasq
> server and resolving a particular office server hostname using the
> real-world IP, and not the local one. I'm not sure if this is
> happening for any other people in the office as the server in question
> is not yet being accessed by anyone but me. I'm also not sure if this
> is happening for another other servers in the office, or just the
> specific one I noticed.
> 
> Anyway, my dnsmasq,conf file is as follows (just the uncommented
> lines):
> 
> expand-hosts
> domain=xxxxxxxx.com
> dhcp-range=eth1,192.168.1.100,192.168.1.200,12h
> dhcp-option=option:netmask,255.255.255.0
> dhcp-option=option:router,192.168.1.1
> dhcp-option=option:dns-server,192.168.1.25
> dhcp-option=option:domain-name,xxxxxxxx.com
> dhcp-option=28,192.168.1.255
> dhcp-option=option:domain-search,xxxxxxxx.com
> conf-dir=/etc/dnsmasq.d
> 
> The behaviour I'm seeing is that when I try to ping or connect to
> dev1.xxxxxxxx.com (or just dev1), it should resolve to 192.168.1.26,
> which it does....for a while. However, more than once I've discovered
> that it's started resolving to the outside IP which is something like
> 24.x.x.x. The only way to fix it is to drop my wireless connection and
> then reconnect. FYI, I've disabled the DHCP server on the wireless
> router.
> 
> Any idea what's happening?
> 
> Thanks,
> Guy
> 
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