Running an LTSP server requires certain other tools like a DHCP or NBD server, with specific configurations. With ltsp-config you can generate or update these configuration files based on your current setup.
The ltsp-config command accepts several options to generate the files: dnsmasq, isc-dhcp-server, lts.conf and nbd-server. The first three should be run manually, the configuration of nbd-server is called automatically at the end of ltsp-update-image. For instance, to generate a dnsmasq config file do:
Updating or generating a configuration file for a service, requires the service to be restarted. Because the various distro's use different methods for initializing service scripts, the function to call a service can be distro specific.