[B.A.T.M.A.N.] Question about batman adv

Hello, 1) I can't creat the 2 files: cat /sys/kernel/debug/batman_adv/bat0/log echo 2 > /sys/class/net/bat0/mesh/log_level

then when i write this line, i have the result: sudo batctl log Error - can't open file '/sys/kernel/debug//batman_adv/bat0/log': No such file or directory To read the debug log you need to compile the module with debugging enabled (see the README)

WWW@ubuntu:~$ sudo batctl ll Error - can't open file '/sys/class/net/bat0/mesh/log_level': No such file or directory To increase the log level you need to compile the module with debugging enabled (see the README)

How can i compile it ?

2) The MTU = 1528 is not need to be set on the computer ?

3) How can i lauch batman-adv in debug mode to see all node ?

thank's for your reply,