Check DHCP and config file

ls /tftpboot/cm
# NOTE: you should se config files of your added modems

ls -R /etc/dhcp/nmsprime/cmts_gws
# NOTE: you should see the cmts dhcp config file

Check all services are running

systemctl status dhcpd
systemctl status named
systemctl status xined

Check selinux

sestatus | grep -i mode

Current mode and Mode from Config MUST be "permissive" or "disabled" !

Check Logfile

less /var/log/messages

If everything works well you should see first Cable Modems requesting DHCP (DISCOVER, OFFER, REQUEST, ACK) followed by Named and tftp config file download