Error when running mesh.py

[Huy Đỗ Quang]

Hi all, I am facing a wmediumd socket problem running Mininet-WiFi on Ubuntu 22.04 inside VirtualBox. Any help?

• Running sudo python3 mn_wifi/examples/mesh.py fails at startup with:

  *** Connecting to wmediumd server /var/run/wmediumd.sock FileNotFoundError: [Errno 2] No such file or directory

• which wmediumd → /usr/bin/wmediumd

• ps aux | grep wmediumd → no running process, no socket file:

  ls -l /var/run/wmediumd* -> No such file or directory

What I tried

• Ran sudo util/install.sh -l from the mn-wifi repo (it compiled and installed wmediumd to /usr/bin).

• Observed that mn-wifi attempts to connect to /var/run/wmediumd.sock but no socket is created because wmediumd is not started in server mode.

I have following questions

1. Should Mininet-WiFi itself spawn wmediumd -s -c <cfg> automatically? If so, why would it not start it after a fresh install?

2. Anything specific to VirtualBox guests I should check (permissions, SELinux/AppArmor, mac80211_hwsim)? I did not see any wmediumd logs — it just exits when started without -s.

Thanks in advance.

[Ramon Fontes]

Hi,

This is an issue I have never encountered before. At the moment, it is
difficult to determine exactly what is happening. Under a clean system
with a standard Ubuntu installation, everything should operate
normally.

Em seg., 17 de nov. de 2025 às 15:42, Huy Đỗ Quang
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