After the installation of ptpd

 opkg update
opkg install ptpd.

I started it with the command

etc/init.d/ptpd start

The same on my Ubuntu machine which should be the PTP Server. The Aruduino Yun and the Server are on the same wifi network.

On the Ubuntu I've run this instruction

ptpd -c -g -b eth0 -h -D.

and I expected something like (from http://grepjuice.com/tag/ubuntu/)

timestamp, state, clock ID, one way delay, offset from master, slave to master, master to slave, drift
2013-02-21 11:35:04:264259, init
2013-02-21 11:35:04:265653, lstn
2013-02-21 11:35:04:287806, slv, 000efefffe000be6/01, 0.000000000, 0.000000000, 0.000000000, 0.000000000, 0
2013-02-21 11:35:05:817610, slv, 000efefffe000be6/01, 0.000000000, -0.000604000, 0.000000000, 0.001208000, -604
2013-02-21 11:35:06:288303, slv, 000efefffe000be6/01, 0.000000000, -0.001173500, 0.000000000, 0.001139

but I get 

2015-12-09 12:55:38.136393, init, 
2015-12-09 12:55:38.208915, lstn_init,  1 
2015-12-09 12:55:50.208552, lstn_init,  1 
2015-12-09 12:56:02.211417, lstn_init,  1 
2015-12-09 12:56:14.580088, lstn_init,  1


How do I use ptpd module?