Re: [Linuxptp-users] Linux PTP Traffic Not Showing Up On Slave Only Machine.

[Omar P. <op...@am...>]

we had similar problem

we solved changing the following configuration:

/etc/sysctl.d/10-network-security.conf

# Turn on Source Address Verification in all interfaces to
# prevent some spoofing attacks.
net.ipv4.conf.default.rp_filter=1
net.ipv4.conf.all.rp_filter=1

# Turn on SYN-flood protections.  Starting with 2.6.26, there is no loss
# of TCP functionality/features under normal conditions.  When flood
# protections kick in under high unanswered-SYN load, the system
# should remain more stable, with a trade off of some loss of TCP
# functionality/features (e.g. TCP Window scaling).
net.ipv4.tcp_syncookies=1


change

net.ipv4.conf.default.rp_filter=0
net.ipv4.conf.all.rp_filter=0


Omar



Omar Pighi

Sr. Engineer, VisLab


     Email  op...@am...<mailto:op...@am...>  -  Phone: +39 0521 90 6181 (GMT+1)
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Il 18/12/2017 16:13, Joey DiGiorgio ha scritto:
Sorry for the long wait but I didn't get a chance to try your suggestion until this morning.

I disabled my firewall on both machines. The results are shown below.

    sudo iptables -L -n

    Chain INPUT (policy ACCEPT)
    Chain FORWARD (policy ACCEPT)
    Chain OUTPUT (policy ACCEPT)

The UDP messages still show up via tcpdump but the slave ptp4l instance is not picking up offsets.

- Joey D.

On Dec 15, 2017 12:49 PM, "Richard Cochran" <ric...@gm...<mailto:ric...@gm...>> wrote:
On Fri, Dec 15, 2017 at 12:09:02PM -0500, Joey DiGiorgio wrote:
> Any ideas on what might be going wrong here?

Try turning off the firewall.

HTH,
Richard


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