** Description changed: + [Impact] + This issue affects all users of NetworkManager in a dual stack (IPv4 w/ IPv6 on the same network) environment. When any router advertisement is received, NetworkManager restarts dnsmasq in order to update the DNS configuration it uses. + This change modifies the method of update of dnsmasq to use DBus methods instead of writing a configuration file; which avoids having to restart the daemon to re-read the configuration. + + kill -USR1 <dnsmasq pid> can be used to output to syslog the current DNS + servers used by dnsmasq. + + [Test Case] + 1) Run NetworkManager in an dual-stack IPv4/IPv6 environment. + 2) Verify that dnsmasq does not get restarted when a router advertisement is received. + + [Regression Potential] + This change affects the underlying daemon used by NetworkManager to help with DNS resolution on the system. This daemon is updated via DBus. Since the method of update is changed; this may affect the resulting effective configuration of dnsmasq and break DNS resolution in case of a regression. + + ---- + NetworkManager stops and starts dnsmasq very frequently (every few minutes). During the brief window that dnsmasq is restarting, hostname resolution doesn't work. dnsmasq is getting restarted frequently enough that I see brief hostname resolution errors in Chrome several times a day during normal web browsing. This is on Precise with network-manager 0.9.4.0-0ubuntu4 and dnsmasq- base 2.59-4. The frequent restarts seem to be triggered by IPv6 route advertisements on my network. (See log snippet below.) When NetworkManager gets a route advertisement, it reconfigures everything. In the case of dnsmasq, this means stopping dnsmasq, writing a new config file, and starting dnsmasq. NetworkManager should restart dnsmasq only if it its configuration changes. I'm attaching a snippet from /var/log/daemon.log on my system that demonstrates a restart. This is with debug logging configured in /etc/NetworkManager/NetworkManager.conf.
-- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to dnsmasq in Ubuntu. https://bugs.launchpad.net/bugs/1004775 Title: NetworkManager restarts dnsmasq and adds host route on every IPv6 route lookup To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1004775/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
