Hi Simon,
[QUOTE=smflood;19850]On 12/03/2014 15:14, dmiller wrote:[COLOR=blue]
sorry, what I posted was a typo.
This is the config file that I run.
######################################################[/COLOR]
[COLOR=blue]
option nds-server x.x.71.253[/COLOR]
[COLOR=blue]
#######################################################this is the error I get.
########################################################
/etc/dhcpd.conf line 6: unknown option dhcp.nds-server
option nds-server 172.
^
Configuration file errors encountered – exiting
#########################################################[/COLOR]
Try “option nds-servers x.x.71.253”.[/QUOTE]
There are those trailing “;” that somehow got lost in your response (but was included in the original config file, so dmiller will most probably have noticed right away…) 
Regards,
Jens