Re: [Linuxptp-users] ptp4l and network connectivity interruption

[Richard C. <ric...@gm...>]

On Thu, Dec 10, 2015 at 12:06:19PM -0500, Brian Walsh wrote:
> It is an Intel 82574L. 8086:10d3

Ok, I have that card.  The driver is the e1000e (and not the e1000).
Can you send me your iptables script so that I can try and reproduce
the problem?

> Looking again it appears it may be the opposite of what I thought.
> ptp4l is maintaining the
> offset value while the hardware clock has switched back to UTC time. I
> am not seeing
> anywhere that ptp4l is reseting the offset to 0 during this state.

Right, it is in the driver or HW.  I remember that card resetting the
clock after link loss.  I complained about this, but Intel said it was
as HW limitation, IIRC.

However, I wouldn't expect this to happen just from the action of the
firewall.  That sounds more like a driver bug.

Thanks,
Richard