RE: Query about Micrel Kendin switches

[Vanitha Ramaswami <vanitha@xxxxxxxxxxxxxxxx>]

Hello,

I am still not clear on why the PROMISCUOUS mode is not working. We are 
using the Kendin switch KS8995X  configured to duall MII mode(using the ADI 
Engineering Coyote board design).  In this mode, the KS8995X acts like "two 
separate devices".  One is a switch, comprising of PHY ports {1,2,3,4} and 
the SW-MII port.  The other is a standalone single port PHY, comprising of 
PHY port 5 and the P5-MII port.

In our custom IXP425 platform we are using  PHY port 4(ixp0) & 5 (ixp1).

The PHY port 4 (ixp0) is able to see all the packets that is there in the 
LAN, whereas i have problem with ixp1.

IXP1 is also able to receive all the packets in the LAN when it is 
connected alone to the Ethernet HUB. The problem comes when i put the 
another IXP425 unit to the Hub. I am able to see only the ARP packets.

I dont understand why the interface IXP0 ie.(PHY port 4) is able to see all 
the packets(including the unicast packets) in the LAN, even though i have 2 
of my custom IXP425 units connected to the Hub.

Thanks
Vanitha




On Saturday, January 29, 2005 1:00 AM, George Joseph 
[SMTP:gtj.member@xxxxxxxxxx] wrote:
> Oh, no kidding.  PROMISCUOUS mode is pointless on a device that sits 
behind
> the KS (or any other) switch.  You'll never see unicast packets that 
aren't
> destined for that specific mac address because the KS won't forward them.
> You should see broadcast packets however.  Try an arping.
>
> -----Original Message-----
> From: Erik Mouw [mailto:erik@xxxxxxxxxxxx]
> Sent: Friday, January 28, 2005 3:51 AM
> To: Vanitha Ramaswami
> Cc: 'George Joseph'; linux-arm@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re: Query about Micrel Kendin switches
>
>
> On Fri, Jan 28, 2005 at 03:48:53PM -0000, Vanitha Ramaswami wrote:
> > My setup is like this, I have connected 2 of our custom IXP425 units to 
an
>
> > Ethernet Hub and a PC is also connected to the ethernet hub.I have put 
the
>
> > IXP1 interface in PROMISC mode. I am running an application in IXP425 
in
> > PROMISCUOUS mode in-order to capture all the packets that is received 
on
> > IXP1 interface, i dont see the packets sent by the PC connected to the
> > Ethernet Hub by both of the IXP1 interfaces. Only one of the IXP425
> > receives it.
>
> According to the product brief[1], the KS8995X is a *switch and* not a
> *hub*. The kind of behaviour you see is completely normal for ethernet
> *switches*.
>
>
> Erik
>
> [1] http://www.micrel.com/_PDF/Ethernet/ks8995x_pb.pdf
>
> --
> ----  Erik Mouw  ----  www.bitwizard.nl  ----  +31 15 2600 998  ----
>
>
>
> 

-------------------------------------------------------------------
Subscription options: http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm
FAQ/Etiquette:       http://www.arm.linux.org.uk/armlinux/mailinglists.php