Comment 2 for bug 246314

As there is no reasonable/robust mechanism of updating the /etc/dhcp3/dhclient.conf, I believe requesting 'ntp-servers' always is the best practical way.
 - this needed when your DHCP server hands out only what is requested
  -> eg Microsoft DHCP service (and unlike ISC DHCPD)
 - if the option is available, it is stored in the lease
 - if 'ntp' is installed, we get NTP working as it should
 - if it's not installed, no problem!

This clearly presents an integration issue in certain environments (eg corporate), so addressing it is a positive move!