github.com/containers/podman/v5@v5.1.0-rc1/docs/source/markdown/options/user-mode-networking.md (about)

     1  ####> This option file is used in:
     2  ####>   podman machine init, machine set
     3  ####> If file is edited, make sure the changes
     4  ####> are applicable to all of those.
     5  #### **--user-mode-networking**
     6  
     7  Indicates that this machine relays traffic from the guest through a user-space
     8  process running on the host. In some VPN configurations the VPN may drop
     9  traffic from alternate network interfaces, including VM network devices. By
    10  enabling user-mode networking (a setting of `true`), VPNs observe all
    11  podman machine traffic as coming from the host, bypassing the problem.
    12  
    13  When the qemu backend is used (Linux, Mac), user-mode networking is
    14  mandatory and the only allowed value is `true`. In contrast, The Windows/WSL
    15  backend defaults to `false`, and follows the standard WSL network setup.
    16  Changing this setting to `true` on Windows/WSL informs Podman to replace
    17  the WSL networking setup on start of this machine instance with a user-mode
    18  networking distribution. Since WSL shares the same kernel across
    19  distributions, all other running distributions reuses this network.
    20  Likewise, when the last machine instance with a `true` setting stops, the
    21  original networking setup is restored.