I’m subscribed to Nextdns that requires updating to its URL when my ISP change my public IP address, I have to manually linked my IP address to reconnect Nextdns. On Openwrt, I set up a cron job with curl to automate this process and works great, since curl is not available on Pakfire, how do this on IPfire without paying ddns subscription.
Use fcron with curl.
curl is available at /usr/bin/curl. It is built in as a core program.