First of all, it looks like the offset is really, really high between your embedded board and your laptop. You can probably use "chrony" to sync them: http://chrony.tuxfamily.org/ ntp_monitor.py checks against both the remote host, and the computer. If either one of these commands fails, then ntp_monitor.py won't work. I wrote a ticket, so I can disable this call in a future release: https://code.ros.org/trac/wg-ros-pkg/ticket/4277 The exact command ntp_monitor.py runs is against the hostname of the computer, not the IP. Can you try: $ python > import socket > socket.gethostname() MY_HOSTNAME $ ntpdate -q MY_HOSTNAME Can you post the output from that command, and the return code (from "echo $?"). Thanks. Kevin On Wed, May 5, 2010 at 10:41 AM, Enea Scioni wrote: > > Sure! > On my laptop the output is: > $ ntpdate -q 127.0.0.1 > server 127.0.0.1, stratum 3, offset -0.000012, delay 0.02565 > 5 May 19:22:28 ntpdate[5000]: adjust time server 127.0.0.1 offset > -0.000012 > sec > > and > > $ ntpdate -q 134.58.255.1 > server 134.58.255.1, stratum 2, offset -0.000195, delay 0.02599 > 5 May 19:22:57 ntpdate[5001]: adjust time server 134.58.255.1 offset > -0.000195 sec > > where 134.58.255.1 is the server ip. > > Instead, on embedded board: > $ ntpdate -q 127.0.0.1 > server 127.0.0.1, stratum 0, offset 0.000000, delay 0.00000 > 1 Jan 01:08:09 ntpdate[1535]: no server suitable for synchronization found > > (expected, because there isn't the ntp deamon running on embedded board), > and > $ ntpdate -q 10.8.30.30 > server 10.8.30.30, stratum 3, offset 1273079765.187633, delay 0.02666 > 1 Jan 01:09:58 ntpdate[1541]: step time server 10.8.30.30 offset > 1273079765.187633 sec > > where 10.8.30.30 is the ip assigned at my pc on LAN. > > Enea Scioni > > -- > View this message in context: > http://ros-users.122217.n3.nabble.com/ntp-and-multi-machines-tp765453p779546.html > Sent from the ROS-Users mailing list archive at Nabble.com. > > > ------------------------------------------------------------------------------ > _______________________________________________ > ros-users mailing list > ros-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/ros-users > _______________________________________________ > ros-users mailing list > ros-users@code.ros.org > https://code.ros.org/mailman/listinfo/ros-users >