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Wireshark-users: Re: [Wireshark-users] Ethernet flow control

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From: "Jake Peavy" <djstunks@xxxxxxxxx>
Date: Thu, 4 Dec 2008 17:15:55 -0500

Thanks Jaap,

I should probably start off by saying that I'm not sure I understand flow control completely; I'm a little out of my depth.

I've also tried capturing off the full duplex 10/100 switch, but don't see them there either.

Should I just be able to look for eth.type == 0x8808 in order to see flow control information or do I need to look inside the Frame/Ethernet headers?

I did look at the sample capture: http://wiki.wireshark.org/SampleCaptures?action=""> but I'm not sure if that's what to expect. If it is, and if they're there, I'm definitely not seeing them.

Thanks again,
-jp

On 12/4/08, Jaap Keuter <jaap.keuter@xxxxxxxxx> wrote:

Hi Jake,

Sticking in a hub will make it half duplex, so full duplex rate control is out
of the question. Better get a passive tap.

Thanx,
Jaap

Jake Peavy wrote:
> Hello all,
>
> I believe we're running into an issue caused by one device sending PAUSE
> frames onto the wire and impairing the bandwidth delivered by the
> upstream switch.
>
> I have placed a 10BaseT hub (old school) in the datapath and attempted
> to capture this information using a linux host running Wireshark, but I
> do not see any flow control information.
>
> Is there anything I need to do to the ethernet driver/interface in order
> to capture this traffic using Wireshark?

--
-jp

Laurie got offended that I used the word "puke." But to me, that's what her dinner tasted like.

deepthoughtsbyjackhandy.com

Follow-Ups:
- Re: [Wireshark-users] Ethernet flow control
  - From: Bill Meier
- Re: [Wireshark-users] Ethernet flow control
  - From: Jaap Keuter

References:
- [Wireshark-users] Ethernet flow control
  - From: Jake Peavy
- Re: [Wireshark-users] Ethernet flow control
  - From: Jaap Keuter

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