Login as root and type the
config setprop dhcpd end 192.168.1.200
signal-event remoteaccess-update
commands. That should do it.
But I'd recommend using the configuration "wizard": login as root, type the
console
command. Then choose option "2. Configure this server". Go through all the screens without changing anything and only change the end address of your dhcp range. Reboot the server for the changes to take effect.