As of dhcp-client-3.0.1-alt8, dhclient-script expects interface configuration to
be included from /etc/sysconfig/network-scripts/<interface_name>:


====== 8< ======
cd /etc/sysconfig/network-scripts
. /etc/sysconfig/network-scripts/network-functions
. /etc/rc.d/init.d/functions
 
[ -f ../network ] && . ../network
[ -f ../networking/network ] && . ../networking/network
 
CONFIG=$interface
 
[ -f "${CONFIG}" ] || {
    echo $"$0: configuration for $interface not found." >&2
    exit_with_hooks 1
}
 
source_config
====== >8 ======


Proper location for this, as documented in net-scripts README, is
/etc/sysconfig/network-scripts/ifcfg-<interface_name>.

The temporary workaround is to make a symbolic link to the ifcfg-prefixed file
so that dhclient-script finds it.