Try also add gateway for the Secondary IP in Wifi adaptor, but it will keep rollback to 0.0.0.0

[ycyleo]

Your system information

• Steam client version:
• SteamOS version: 3.5.17
• Opted into Steam client beta?: [Yes]
• Opted into SteamOS beta?: [Yes]
• Have you checked for updates in Settings > System?: [No]

Please describe your issue in as much detail as possible:

For some reason to play a private server game in desktop mode, I need to have 2 separate IP for Server and Client. I then try to add secondary IP in wifi setting then also add gateway for it, but it will keep rollback to 0.0.0.0 . Then tested to run the server and game and they seem not talking to each other.

May I have any advise on this? much appreciate.

here is the scrennshot: