Hi,
If this is Ethernet then all the info appears on the "front" pane without having to use the Advanced Button.
However if it is "Using DHCP" as my English version reads you should see the IP address, Subnet Mask, "router IP" listed already.
The Thunderbolt port (which you highlight by making it the "front" pane) can do many things including make Network connections to other Macs (like Firewire can).
As it is not connected to another Mac or a networking device that uses Thunderbolt then the Connection method has a red blob (Not Connected)

7:45 pm Monday; January 27, 2014
iMac 2.5Ghz 5i 2011 (Mavericks 10.9)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad