Networking stopped functioning

['Forum Post]

Have a 'sort of' same problem, here is the brief story:

I installed kubuntu on the new Laptop for my mother (Thinkpad a30).

Used my local network for that (fli4l router as gateway 192.168.1.1)
after all online updates and installes I was setting up the kpp via
modem for my mother (to use at here home).
Haveing a lot of pain with that I finally mange that (user must be
member of groups uucp and dip). For this I had to disable the gateway
192.168.1.1, which I did over the GIU system settings networkin in
administrater mode.

But for backups and system maintenance I want to have this working back
in my local network and now the pain starts again. Any time I set up a
default gateway (again with system settings/networking), it's just been
ignored by the system.
neither /etc/init.d/networking restart nor booting helped.
So far I wasn't able to set up a default gateway again.
Is there any chance to get this working with command line??

Thanks

PS:
cat /etc/networkin/interfaces:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback
address 127.0.0.1
netmask 255.0.0.0

# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
mapping hotplug
script grep
map eth0

# The primary network interface
iface eth0 inet static
address 192.168.1.7
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
# dns-* options are implemented by the resolvconf package, if
installed
dns-nameservers 192.168.1.1
dns-search farscape


-- 
mclien