Comment 20 for bug 991481

More experiments, results and proposed solution:

1) On a system with

  whoopsie running
  network-manager NOT running, but network interface initialized via /etc/network/interfaces
  dnsmask running with network-managers configuration for dnsmasq
  IPv6 aktivated

I see the annoying repetive DNS-traffic for daisy.ubuntu.com. One or more packets per minute. This proves network-manager itself is not the bad guy!

2) Network-manager provides a configuration to dnsmask which disabled cache (--cache-size=0). Removing this option from dnsmasq configuration reduces traffic rate to 1 packet per 10 minutes. This corresponds to the lifetime for the DNS record of daisy.ubuntu.com which is set to 600 seconds.

3) Running network-manager again and dnsmasq started from network-manager, but with the modified configuration shows same result as #2.

4) HOWTO modify configuration for dnsmasq: Network-manager provides the option --cache-size=0 as argument on command line. This cannot be overriden by config-files, but you can use a wrapper script which is called by network-manager instead of real dnsmasq. The fake dnsmask purges the option --cache-size=0 and calls the real dnsmasq.

I provide this wrapper script as attachment. Place it in /usr/local/sbin (this directory is searched before /usr/sbin), name it dnsmasq, set owner and group to root and set execute bits. Use at own risk.

Enjoy!