Ask Your Question
0

How to see the FCS in Ethernet frames?

asked 2018-05-05 07:24:15 +0000

updated 2018-05-07 09:00:08 +0000

Guy Harris gravatar image

When using wireshark to sniff ethercat frames (while a Twincat project is working), I can see all but the FCS

edit retag flag offensive close merge delete

1 Answer

Sort by » oldest newest most voted
0

answered 2018-05-05 08:08:38 +0000

NJL gravatar image

updated 2018-05-05 08:16:40 +0000

Depending on your OS and/or how you captured your traffic it's highly likely it's not possible.

Personally I've never seen it even when capturing using passive fiber TAPs (via a Network Packet Broker).

See this post for more discussion (and possible solutions) to the problem: https://osqa-ask.wireshark.org/questi...

edit flag offensive delete link more

Comments

1
1

You can do this with an Intel NIC on windows, too: https://www.intel.com/content/www/us/...

Christian_R gravatar imageChristian_R ( 2018-05-05 20:05:08 +0000 )edit

@Christian_R: Nice! Didn't know about this. Thanks!

NJL gravatar imageNJL ( 2018-05-05 20:18:15 +0000 )edit

@Christian_R, that Intel article talks about VLAN tags, not Frame Check Sequences. What am I missing?

cmaynard gravatar imagecmaynard ( 2018-05-07 14:52:40 +0000 )edit

@cmaynard 1—enabled (Store bad packets. Store CRCs. Do not strip 802.1Q vlan tags)

Christian_R gravatar imageChristian_R ( 2018-05-07 14:58:12 +0000 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools

1 follower

Stats

Asked: 2018-05-05 07:24:15 +0000

Seen: 62 times

Last updated: May 05