Ddns won't automatically update

[x86cokr]

Thanks

It seems that ddns works

[x86cokr]

Previously, 'service ddns restart' works ok thanks to the suggestions.

Additionally, today I found that when ddns automatically tried to update registered ip to ddns provider after isp changed the ip of my router, the following error occured

 104600 ERROR : cURL Error: '28'
 104600       : curl: (28) Failed to connect to www.duckdns.org port 443: Operation timed out 

Then, I've learned that configuration should be changed by interface name.
As my router uses pppoe, I just changed as followes from default configuration in /etc/config/ddns

    option ip_source    "network"
    option ip_network   "wan"
=>
    option ip_source 'interface'
    option ip_interface 'pppoe-wan'

Then, automatic update of ddns works ok.