RE: packet forwarding using MAC multicast

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Group multicast addresses are there i.e. mac address with the first bit set
to one. example: 11:22:33:44:55:66 is a group multicast address.
To send the packet to more than one backend machines (which are hidden from
client either through router/server frontend machine in your case) you have
to run some application at your frontend machine which can retrieve the
header information from the client and forwards the packet to all machines
in any particular group.
You can take some idea how ARP packets are sent, ARP cache is built.
-----Original Message-----
From: linux-net-owner@vger.kernel.org
[mailto:linux-net-owner@vger.kernel.org]On Behalf Of Tace
Sent: Thursday, May 15, 2003 5:56 PM
To: linux-net@vger.kernel.org; Ronghua Zhang
Cc: kernelnewbies@nl.linux.org
Subject: Re: packet forwarding using MAC multicast


Hi,
  What I think is that there are no such thing as MAC multicast, correct me
if I am wrong , thanks. I think when MAC address of a packet with a
multicast address is sent to a physical subnet, it should be
FF:FF:FF:FF:FF:FF , ie. for all to receive.

Tace

On Thu, 15 May 2003 16:58:01
 Ronghua Zhang wrote:
>I want to implement packet forwarding using MAC multicast. Basically, what
>I want to acheive is the following: a frontend machine accept packets from
>client side and forwards the packets to more than one backend machines.
>The easiest way is simply forwarding packet once for each backend. But
>this will consume too much bandwidth, that's why I resort to multicast.
>But I have no idea how to let the MAC layer send a packet to a multicast
>address, Anybody can shed some light on this? Thanks.
>
>ronghua
>-
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