I have 2 problems.
First, I tried to use EZ-IPUpdate with DuckDNS and now it runs, but I get these errors:
Dec 15 03:26:02 custom_script: Running /jffs/scripts/ddns-start (args: 192.168.100.10)
Dec 15 03:26:03 ddns: Completed custom ddns update
Dec 15 03:31:56 ddns_update: ez-ipupdate...