ptpd2 not working on a peer-to-peer master-slave connection

Question

I have a couple of x86 machines connected through a direct 10GbE connection. Interfaces are up and working (i.e. the machines can ping each other). Both machines run CentOS Linux.

I need to setup ptpd to synchronize the machines in order to get timestamps with a microsecond timing resolution.

I have:

• installed ptpd with yum
• edited the /etc/ptpd2.conf file (putting one machine as masteronly and the other as slaveonly)
• run the service through service ptpd2 start

The ptpd components communicate (verified either through through tcpdump and the ptp log files). Moreover, the /var/log/ptpd2_kernelclock.drift file shows the measured dritf.

However, date shows that times are not synchronized and a simple client-server test shows that timestamps are not synchronized.

Any idea what is wrong ?

Answer 1

The only solution we've found has been to reinstall ptpd through yum. For some (very weird) reason, re-installing ptpd with the same configuration file solved the wrong behavior.