Comment 6 for bug 770324

From the dhclient.conf manpage:

DHCPV6 OPERATION
       The client does not yet have a default DHCPv6 Option Request Option
       (ORO), nor has it been integrated with the 'request' and 'require' syn‐
       tax above. It is neccessary to configure an ORO then.

         send dhcp6.oro 1, 2, 7, 12, 13, 23, 24, 39;

       The above ORO will request both identifiers (server, client), the pref‐
       erence, unicast, nameservers, domain-search, and FQDN(v6) options.

If you still have that Fedora14 install, can you confirm whether an oro is specifically defined on that system, if it's indeed running isc-dhcp 4? I think it does, but this mostly depends on whether the "dhcp" rpm package is installed; see 'rpm -q dhcp' if my memory serves me right.