[CentOS] broadcastclient does not work on CentOS 4.1

This ntp.conf file works fine under RedHat 9:

   authenticate no
   #enable auth
   driftfile    /etc/ntp/drift
   keys         /etc/ntp/ntp.keys
   server       127.127.1.0
   fudge        127.127.1.0 stratum 10
   trustedkey   1
   enable bclient
   broadcastclient

However, it doesn't work on CentOS 4.1.  ntpd complains with this error message:

    Unable to listen for broadcasts, no broadcast interfaces available

Has anyone gotten ntp broadcastclient to work under CentOS?  This is
very similar to the problem explained by this email thread:

   http://lists.freebsd.org/pipermail/freebsd-questions/2004-August/057010.html

Any help is appreciated.