Client is a proprietary WiFi dongle used for a solar inverter communication.
Chinese closed staff.
But in the mean time it finally switched to new address. After few hours and few reset’s.
It worked well for 2 year on Asus router, btw.
So it’s getting IP now but still does not communicate with cloud …
Have a bad day …
I did my best to debug dongle transmission but without luck …
Finally I stopped Squid , it did nothing. Then rebooted IPFire…
And BOOM all data was transferred to the cloud.
Do not ask me whats was wrong …
My only idea is that Squid messed communication as the only open port on destination IP is 80 (Chinese security …)
Other DHCP issues were only a side problems.