[B.A.T.M.A.N.] MTU issue

Hi All

We are having a small isue with mtu, on certain builds, could be only
the latest, we are getting this error in wrt.

batman_adv: bat0: The MTU of interface wlan0 is too small (1527) to
handle the transport of batman-adv packets. Packets going over this
interface will be fragmented on layer2 which could impact the
performance. Setting the MTU to 1528 would solve the problem.

I had the same issue previously, but 1528 did not do it.
I have since changed build on that unit and can't remember the actual
value I used, But it was larger.

All I did was increase the value until the warning disappeared, and
everything started working as advertised.

Any idea's?

Wayne A

Hi,

I had the same issue previously, but 1528 did not do it.
I have since changed build on that unit and can't remember the actual
value I used, But it was larger.

All I did was increase the value until the warning disappeared, and
everything started working as advertised.

what do you mean with "working as advertised" ? It should work even if you get 
this warning. All it does is fragmenting your traffic.

Setting the MTU to 1528 works for me. Without providing more information about 
your setup and giving us the number which seemingly "fixed" it for you nobody 
can help you.

Regards,
Marek