netdev - Re: [Open-FCoE] tcpdump <-> FCoE support

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Message-ID: <4C4DCCA6.5060206@cisco.com>
Date:	Mon, 26 Jul 2010 10:57:58 -0700
From:	Joe Eykholt <jeykholt@...co.com>
To:	"Loke, Chetan" <Chetan.Loke@...scout.com>
CC:	devel@...n-fcoe.org, netdev@...r.kernel.org
Subject: Re: [Open-FCoE] tcpdump <-> FCoE support

On 7/26/10 10:30 AM, Loke, Chetan wrote:
> 13:08:21.907971 00:yy:yy:yy:yy:yy (oui Unknown)>  00:xx:xx:xx:xx:xx (oui
> Unknown), ethertype Unknown (0x8906)
>
> On: tcpdump-4.0.0-3, tcpdump doesn't seem to have FCoE support(unless I
> capture it and pipe it to wireshark). Is there any effort currently in
> progress on adding FCoE parsers?
>
>
> Chetan Loke

Good question.  There's no effort in progress that I know of.
I find wireshark very handy and do tend to capture with tcpdump -w
and then read the file with wireshark.  tshark is handy if you
want a CLI mode.

If tcpdump interpreted FCoE frames, then we would want FC, FC-ELS,
and FCP.  Does it already dissect any SCSI frames (e.g., iSCSI)?
I'm not sure how much work it would be, but given tshark
is around, I don't think it's that important.

It could at least be changed to print out FCoE instead of 0x8906,
and FIP instead of 0x8914.

	Joe
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