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Fix openvpn mbuf packet dropped

Written by Mirabellette / / no comments

Hello everyone

I hope you are going great and everything was fine for you.

Use case

I have an openvpn daemon running with TCP on 443 port on a Debian system. I got thousands of error messages since months about MBUF packet dropped. The message was

openvpn MBUF: mbuf packet dropped

It occurs only if you use openvpn over TCP. I know it is considered to be a bad practice because it unneeded traffic but you have to make choice.

What I do

After hours of research, I was able to fix it. I add this two lines to the server configuration file:

tcp-queue-limit 4096
bcast-buffers 4096

Now, you have to restart openvpn with this command : systemctl restart openvpn or service openvpn restart if systemd isn't installed on your system.
You should not see this message in log anymore \o/ and get a little bit more stable connection thanks to the undropped packet.

Sources

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