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This is great! I asked Google how to do that, and had NO IDEA what doors this answer would open.

My host is totally simple, and I was able to tidy up this fix with this ‘Step 2′ :
2) Add /etc/dhclient-vmk0.conf to oem.tgz
$ mkdir /tmp/oem/etc
$ echo “interface \”vmk0\” { send host-name \”$(hostname -s)\”; }” > /tmp/oem/etc/dhclient-vmk0.conf

(The interface “vmk0″ and conf file “-cf ” are described in ‘ps -c | grep dhc’ output)

2) Create /tmp/oem/etc/rc.local.d/send-hostname:
if [ -r /var/run/dhcp-vmk0.pid ]; then
kill $(cat /var/run/dhcp-vmk0.pid)
/sbin/dhclient-uw -pf /var/run/dhcp-vmk0.pid -rt 90 -lf /var/lib/dhcp/dhclient-vmk0.leases -cf /etc/dhclient-vmk0.conf -4 -nw -d vmk0 -hn $(hostname)
fi