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