You didn’t mention before that your IPFire setup was a virtual one. So IPFire is not accessing the internet directly but via your host machine.
In your screenshot empresa is your green network on Adapter 1 using the internal network.
Can you confirm what type of network your red interface is connected to the host via. Is it a Bridged Adapter, NAT, Host-only Adapter or …
If you can’t resolve www.google.com then you have a problem with DNS even if you think it is okay. What does the DNS page say for the general working status and what is the status of each individual DNS server if you press the Check DNS Servers button. I am not sure what it will be called on your system but it is the rightmost button under the list of all DNS servers you have entered.
Also have a look at the unbound logs. You can access them from the Logs - System Logs menu by selecting unbound from the dropdown box and then pressing Update. This should tell you the status of the dns server communication.