Description of problem:

Using system-config-network to adjust static IP settings for eth0. If I change the settings for "Address", "Subnet mask", or "Default gateway address", the netmask is set equal to the gateway.

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

system-config-network 1.5.93

Steps to Reproduce:
1. start system_config_network
2. select eth0 (probably others also) connection and click "Edit" button
3. on "Ethernet Device" dialog, select "Statically set IP addresses" and enter appropriate values for "Address", "Subnet mask", and "Default gateway address".
4. click "Ok" to accept changes.
  
Actual results:

/etc/sysconfig/network-scripts/ifcfg-eth0 contains "NETMASK=192.168.0.3", which is my default gateway.

Expected results:

/etc/sysconfig/network-scripts/ifcfg-eth0 contains "NETMASK=255.255.255.0", which is what I entered in the appropriate box.