[Jaap Keuter <jaap.keuter@xxxxxxxxx>]

Hi,

I haven't worked with them myself. Wikipedia is your friend here:
http://en.wikipedia.org/wiki/Pause_frame

Thanx,
Jaap


Jake Peavy wrote:
> 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=AttachFile&do=get&target=Ethernet_Pause_Frame.cap 
> <http://wiki.wireshark.org/SampleCaptures?action=AttachFile&do=get&target=Ethernet_Pause_Frame.cap> 
> 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 
> <mailto: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?