I install Openwrt: 64 bit x86, intel processor i7, two network card. After huge work it start and works.
Then I make second one: I make a copy of hard disk using dd. So, I make exact copy of the first install. It work, but then I change LAN. So, original first was 10.15.0.0/22 etc. Copy is 10.16.0.0/22 (and later, 17, 18... etc.) Ip of the router 10.15.0.1 (16.. etc).
All work, it is, display + keyboard connected to router I can modify all. But nothing from internal network: computer connected to this router cannot reach router. Eg. luci not work, ping 10.16.0.1 no answer etc etc.
config globals 'globals'
option ula_prefix 'fdc1:e63d:b73e::/48'
Now I see this is dangerous row: after two day work I found, this must be "auto".
Is this right? First install ok, but most clever way is change this line to "auto"? Or, is this line important?