I've installed the NetworkManager package, but when I try to start it, it fails,
and the following is written to /var/log/messages:

Aug 27 15:55:05 dhcp1 NetworkManager: <information>     starting...
Aug 27 15:55:05 dhcp1 NetworkManager: <WARNING>   (): nm_dbus_init() could not
get the system bus.  Make sure the message bus daemon is running?
Aug 27 15:55:05 dhcp1 NetworkManager: <ERROR>   [1125154505.224381]  ():
nm_dbus_init() failed, exiting. Either dbus is not running, or the
NetworkManager dbus security policy was not loaded.
Aug 27 15:55:05 dhcp1 NetworkManager: traceback:
Aug 27 15:55:05 dhcp1 NetworkManager:   /usr/bin/NetworkManager [0x806083c]
Aug 27 15:55:05 dhcp1 NetworkManager:  
/lib/tls/libc.so.6(__libc_start_main+0xd0) [0x401ede60]
Aug 27 15:55:05 dhcp1 NetworkManager:   /usr/bin/NetworkManager [0x804cd81]

I've restarted dbus [rcdbus restart] to load the NetworkManager security policy,
but that made no difference.