Description of problem:

I want to configure the network through the gnome graphical config, which is apparently a frontend to system-config network.

eth0 shall not be under control of Network Manager, we do not get configuration from DHCP but set it statically:

IP = 192.168.1.40
NM = 255.255.255.0
GW = 192.168.1.254

Very classical.

Unfortunately, the configurator insists on resetting the netmask to 192.168.1.254, there is no way to set it to anything reasonable (see screenshot).

Activation of eth0 shows messed-up routes and the netmask 192.0.0.0 configured. No network connection, of course.

[root@gefjun ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:23:54:15:18:31  
          inet addr:192.168.1.40  Bcast:255.255.255.255  Mask:192.0.0.0
          inet6 addr: fe80::223:54ff:fe15:1831/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:236 errors:0 dropped:0 overruns:0 frame:0
          TX packets:306 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:240200 (234.5 KiB)  TX bytes:52162 (50.9 KiB)
          Interrupt:22 Base address:0x2000 

Workaround is to manually correct the netmask in /etc/sysconfig/network-scripts/ifcfg-eth0.

Version-Release number of selected component (if applicable):

system-config-network-1.5.93-2.fc10.noarch, om a fully updated F10 system.

How reproducible:

Unsure as yet.