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
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