The topic was closed so here an update:
The suggestion to eliminate the databsed download every 15 seconds worked fine until a reboot after software updates. Here is the updated procedure:
sudo systemctl stop asl3-update-nodelist.timer
sudo systemctl disable asl3-update-nodelist.timer
sudo systemctl stop asl3-update-nodelist.service
sudo systemctl disable asl3-update-nodelist.service
sudo rm /var/lib/asterisk/rpt_extnodes
Edit rpt.conf and change “node_lookup_method = both” to "node_lookup_method = dns`
Restart asterisk
Roger
WA1NVC
Disable the asl3-update-nodelist service (sudo systemctl stop asl3-update-nodelist && sudo systemctl disable asl3-update-nodelist), delete the file /var/lib/asterisk/rpt_extnodes, and change node_lookup_method = dns (from “both”) in /etc/asterisk/rpt.conf. Currently, the ASL3 system is configured to use both DNS then files and thus the file service is still pulling down the updated directory every 15 seconds.