Neal Becker wrote: ...
I can say now for certain, that it will send the hostname iff you create /etc/dhclient-<iface>.conf with: send host-name "<your hostname>";
This file do exist on my machines. It seems to be created automatically by /etc/sysconfig/network-scripts/ifup-eth:
# cat dhclient-eth0.conf send host-name "evon800c.crc.dk"; # temporary RHL ifup addition
Mogens