Bug 127726

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Description of problem:
When the network is restarted, the initscripts should kill and
possibly restart dhclient. Now they don't. The result is that a
machine can suddenly, out of the blue, dump its fixed IP and revert to
an earlier dynamic one. 

Except for the fact that you suddenly lose a machine and might be
unable to reach it any more, or that services stop working, under some
circumstances this can turn into a severe security risk. Where
restrictions apply based on IP, your policies (or those of somebody
else) can turn meaningless or even dangerous when the machine changes
IP by itself.

Version-Release number of selected component (if applicable):
7.31.13.EL-1

How reproducible:
Always

Steps to Reproduce:
1. Take a box with only one NIC. Configure the interface for dhcp,
start the network and get a lease.
2 Change the configuration in
/etc/sysconfig/network-scripts/ifcfg-eth0 to static and add IP
address, netmask etc. Use an IP other than the leased one. 
3. Run 'service network restart'. Check that the interface is on the
new fixed IP you just gave it. 
4. Wait until the lease of the no longer used dynamic IP expires.
Watch the interface move back to its old dynamic settings. Do 'ps -A
|grep dch'.