MTU Package Size

[SidneyPitterling]

Hey alltogether,

i just set up / flashed 2 Gl.Inet Routers Model: AR300M16.
Both are connecting to eachother and building a mesh, but unfortunately my IP-Cam (Tapo C320WS) is not connecting anymore to my WLAN-SSID.
I remember before i flashed them with LiMe i had to change the MTU packet size to 1420 of the wlan-interface (within the previous firmware via luci), for the camera to actually connect.
Is there an option / paramter for the config to change it in libremesh also?
I couldn't find anything in the cfg-example and i'm a bit lost to be honest.

any help is much appreciated.

[ilario]

Hi and welcome!
Can you login via ssh to the router closest to the camera and check what does logread say when the camera tries to connect? It is possible that logread is full of other messages also.
If you can, could you attach here a file with the output of lime-report? This is just for understanding until which degree the camera is connected.

The camera is connecting via wifi, not ethernet, right? In the camera configuration, make sure to specify the right SSID (e.g. by default it would be the LibreMesh.org one, not the LiMe one). Also, check if you can connect with your laptop-smartphone.

This said, no, we don't expose an easy way to reduce the MTU (because people usually do not need it).

Also, LibreMesh is already recommending a small MTU to the connecting devices:

lime-packages/packages/lime-proto-anygw/files/usr/lib/lua/lime/proto/anygw.lua

Line 14 in 94b468e

anygw.SAFE_CLIENT_MTU = 1350

So please check if this MTU recommendation is working when connecting with the laptop.

Otherwise, I suppose you can edit it directly in /etc/config/network (not recommended as it would be overwritten every time you run lime-config) here:

config interface 'lan'
	option device 'br-lan'
	option proto 'static'
	option ipaddr '10.13.194.57'
	option netmask '255.255.0.0'
	option ip6assign '60'
	option ip6addr 'fd0d:fe46:8ce8::f9:c239/64'
	option mtu '1500'

And I suppose you will have to reduce also some other MTU in the same file, like the ones for babeld and batman-adv interfaces by the same amount. And no idea regarding the other MTU mentioned there (the ones for the mesh interfaces).

If you find a configuration that works, you can make it persistent to lime-config converting it to this syntax:
https://libremesh.org/docs/en_config.html#generic-configs

Let us know how it goes!

[SidneyPitterling]

Thank you for the reply. I will later check the logs when i'm in my garden.

Other clients like laptop and Smartphone are working fine. Since i change the lime-node configs for both of the routers, i have the same ssid with the same passwort as before.

I'll get back as soon as i have taken a look into your points.

[SidneyPitterling]

Hey,

so the issue is solved now - as far as I can tell it had nothing to do with the routers, the firmware, or their settings.

Turns out my IP cam decided to choke itself after i rebooted it, right after I had set up the mesh.
My neighbors cams were connecting just fine (thats why I wanted to set up the mesh - 3 parcels within the mesh and 1-2 cameras per parcel, which are set up within frigate to have proper AI identification).

I completely reset my cam and started the initial setup process, which in the end worked just fine.
The only thing i still have to further look into is, why the cam for example is connecting to the node further away instead of the one closer to it.

Nevertheless, i appreciate the time and effort you took to help me on it.