No network connection

[Nacrug]

Hello,
i last used my proxmox server in 2021 and i forgot almost everything about the configs, but i dont want do reinstall the system. It seems like the server can´t connect to my Network or the internet and i dont know why. Maybe someone can help me.

In the Screenshoots you can see my configs in:
/etc/hosts
/etc/network/interfaces

and the output of ip addr

 

[Lukas Wagner]

It appears to me that the network interface name in /etc/network/interfaces is wrong. ip addr shows that you have enp1s0, but in your network config you have enp2s0. Just change the two lines in /etc/network/interfaces and execute ifreload -a

Hope this helps.