[Solved] DDNS on LEDE behind ISP router detects private ip

+1 to what @Per said. That might be messing things up. I'd also recommend removing the 2 lines that are commented out (just in case they are not being ignored for some reason or another).

in my config, I have the following interface and IP definitions (obviously the url itself is specific to my config):

option ip_source 'web'
option ip_url 'http://ip.changeip.com'
option interface 'wan'

Also, if you don't already have it, there is a LuCI app for ddns. IIRC, it has a wizard for configuration that generally works well for many service. Further, it can be useful for debugging.

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