Router : LinkSys WRT1900ACS, Firmware 18.06.4
I cannot get a WAN IP with OpenWRT. It works fine with LinkSys stock firmware. I can also get WAN IP with a different router like USG. Issue is only with OpenWRT firmeare. I have done the basic trouble shooting ( turn off the modem, router, different versions of firmware etc ).
Issue is seen with David's build also. ( I see the same issue in DD-WRT also ). I have used the OpenWRT with the same router a while ( 1 to 2 year ) ago ( Don't remember the version ). It was working fine at that time.
Mac address of the router remains the same between Stock and OpenWRT firmware. Stock firmware always works fine.
Note: I have disabled wifi in the LinkSys ( Issue is seen with Wifi enabled also). Using Unifi AP as access points. Currently using USG instead of LinkSys.
Any help is appreciated.