Hi Richard,

I have experienced some problems in using PTP with PXE boot. The setup is as 
the following:

- PXE Boot Server (Matchbox) (PTP Slave)
- PXE booted server (PTP Master)
- Other PXE booted servers

At first, the PTP Master is booted by using the PXE boot server. The PXE boot 
server will run in slave mode and will listen to the PXE booted PTP Master. 

Now, when booting any other server in my network by using PXE boot on the PXE 
Boot Server (which is the PTP Slave), the PXE Boot Server’s PTP Slave instance 
will return an error saying to increase tx_timestamp_timeout or that it will 
likely be a driver problem. The PXE Boot Server then get’s an offset of 36 
seconds and returns clock check messages. 

I found that when increasing the tx_timestamp_timeout on the PTP Slave instance 
on the PXE Boot Server to 200ms instead of the default 1ms, other servers boot 
through PXE without any problems on the PXE Boot Server. 

Is this a normal behaviour of a PXE Boot Server running in Slave mode, maybe 
due to the increase of network traffic when booting other servers through PXE?

Jord
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