[etherlab-users] Sniff the network

[Gavin Lambert]

The CU2508 has been brought up a few times - it is definitely not compatible
with Etherlab (or Linux in general, as far as I know).  It would be nice if
it were, but nobody has put time in to write a custom driver for it yet.

 

From: Graeme Foot
Sent: Tuesday, 14 February 2017 10:34
To: Lander Usategui San Juan <lander at erlerobotics.com>;
etherlab-users at etherlab.org
Subject: Re: [etherlab-users] Sniff the network

 

Hi,

 

Generally you place a switch (not a hub) between two slaves in your fieldbus
and then connect a computer to a third port in the switch.  On the computer
you disable all protocols on the connected port (to avoid the computer
sending any packets on that port) and run Wireshark.

 

If the switch is configurable make sure it doesn't delay forwarding of the
packets.

 

The computer connected to the switch could be your CX9020.

 

Wireshark is not running realtime so you can't rely on the Wireshark
timestamps too closely.  However, if you are running Distributed Clocks you
can look at the distrubuted clock reference slave timestamp (32 bits only so
it does roll over every 4.2 seconds appoximately).  Or better yet, if you
have some spare money, you could buy a Beckhoff ET2000 network probe.

 

 

As for the CU2508, I haven't seen anyone mention it in the forums and from a
quick look I suspect it might need a special device driver.

 

 

Regards,

Graeme Foot.

 

 

  _____  

From: etherlab-users <etherlab-users-bounces at etherlab.org
<mailto:etherlab-users-bounces at etherlab.org> > on behalf of Lander Usategui
San Juan <lander at erlerobotics.com <mailto:lander at erlerobotics.com> >
Sent: Tuesday, 14 February 2017 05:15
To: etherlab-users at etherlab.org <mailto:etherlab-users at etherlab.org> 
Subject: [etherlab-users] Sniff the network 

 

Hi all!

I have some troubles to capture the packages between CX9020 Linux master
with etherlab and ccat configured.

My configuration:

CX9020 --> EK 1110 --> LAN9252

I'm able to sniff the EtherCAT packages using, "man on the middle"
technique, but the intermediate computer is not real time machine and I have
some delays.

Is it possible sniff directly on mater? How?

Also, is this device
<http://www.beckhoff.co.uk/english.asp?pc_cards_switches/cu2508.htm?id=35911
031548> CU2508, compatible with the Linux master?

Thanks in advance!

 

-- 

Regards,

 

Lander Usategui

Test Engineer

 

 
<http://erlerobotics.com/blog/wp-content/uploads/2014/10/erle_corporativo_5.
0_72px_nobackground.png> 

 

Erle Robotics

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<mailto:lander at erlerobotics.com> 

+34 945 30 68 20 <tel:%2B34%20616151561> 

skype: lusategui

 

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