conflict between system settings/network and entries in /etc/network/interfaces

[robert rottermann]

Hi there,

as soon as I add an interface to /etc/network/interfaces the network 
becomes inaccessible upon next boot:
here the entries I tried:

# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
     address 192.168.1.30
     netmask 255.255.255.0
     gateway 10.168.1.200


I have the *impression*, that this only started to happen, after I 
did/undid some changes in system Settings/Network.

As soon as I have an interface in /etc/network/interfaces defined, and 
the try to open network in system Settings, I get the message that the 
current settings are not compatible.

thanks for any pointers on how to have these two ways of changing the 
network cooperate.

robert