I could finally fix the problem by explicitly adding auto eth0 iface eth0 inet manual up ifconfig $IFACE 0.0.0.0 up down ifconfig $IFACE down
to /etc/network/interfaces. Thus, the complete file looks like this: auto lo iface lo inet loopback address 127.0.0.1 netmask 255.0.0.0 auto eth0 iface eth0 inet manual up ifconfig $IFACE 0.0.0.0 up down ifconfig $IFACE down auto tap0 iface tap0 inet manual up ifconfig $IFACE 0.0.0.0 up down ifconfig $IFACE down tunctl_user christof auto br0 iface br0 inet dhcp bridge_ports eth0 tap0 It seems like eth0 will by default be configured for IP when it is _not_ mentioned in /etc/network/interfaces, so one must explicitly tell the system _not_ to do so if this is not desired. I hope this helps, Christof ** Changed in: kde-systemsettings (Ubuntu) Assignee: (unassigned) => Christof Warlich (cwarlich) Status: New => In Progress -- Network Manager conflict with bridge defined in /etc/network/interfaces https://bugs.launchpad.net/bugs/296782 You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to kde-systemsettings in ubuntu. -- kubuntu-bugs mailing list [EMAIL PROTECTED] https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs