How to use multiple network cards for green network

Hi,

during the first startup I choose red+green+blue+orange, but I noticed, that
i would like to have my internal server still in the green network and changed
the setting back to red+green+blue.

This is the only screen, where I see “orange” .

I had configured in the past the bridge on my old system with the script shown in the answers, but I thought the function is now handled by the ipfire as a standard function.

This link is a dead one. Page is not existing.
https://wiki.ipfire.org/optimization/using_extra_ports_as_a_network_switch

How can I get closer to the problem ?

How is the system handling this ? will it create such a script like “bridge”, which I can check if this one ist existing and how it looks like ?

What is needed to get support ?

Best regards
R.