From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from list by monty-python.gnu.org with tmda-scanned (Exim 4.34)
	id 1BQN5d-00029e-D7
	for qemu-devel@nongnu.org; Wed, 19 May 2004 05:10:17 -0400
Received: from mail by monty-python.gnu.org with spam-scanned (Exim 4.34)
	id 1BQMtX-0007nw-9d
	for qemu-devel@nongnu.org; Wed, 19 May 2004 04:58:18 -0400
Received: from [66.54.152.27] (helo=jive.SoftHome.net)
	by monty-python.gnu.org with smtp (Exim 4.34) id 1BQMWM-0003On-4M
	for qemu-devel@nongnu.org; Wed, 19 May 2004 04:33:50 -0400
From: Mulyadi Santosa <a_mulyadi@softhome.net>
Date: Wed, 19 May 2004 15:32:44 +0700
MIME-Version: 1.0
Content-Type: text/plain;
  charset="us-ascii"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200405191532.45135.a_mulyadi@softhome.net>
Subject: [Qemu-devel] problems: running two instance of Qemu with same MAC
	address
Reply-To: a_mulyadi@softhome.net, qemu-devel@nongnu.org
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://mail.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://mail.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://mail.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: qemu-devel@nongnu.org

hello all

I have problem about identical MAC address...here is the scenario

I run two instances of Qemu for full system emulation. I use Qemu 0.5.5
On both guest system, i can turn on the eth0 (NE 2000 card) . here is the 
dmesg content:

On guest 1 and 2:
NE*000 ethercard probe at 0x300: 52 54 00 12 34 56

Guest 1 IP on eth0 --> 192.168.1.21..attached to tun0 with IP -->192.168.1.11
Guest 2 IP on eth0 --> 192.168.1.22..attached to tun0 with IP --> 192.168.1.12

here is the routing table at the host system:
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.1.21    *               255.255.255.255 UH        0 0          0 tun0
192.168.1.22    *               255.255.255.255 UH        0 0          0 tun1
10.1.1.0        *                    255.255.255.0   U         0 0     0 eth0
127.0.0.0       *               255.0.0.0       U         0 0          0 lo

Both guests can ping the host and the host can ping to these guests. When I 
try to ping from  guest 1 to guest 2, it got no reply (i guess similar with 
dropped packet when u do DROP with iptables)

I realize the fact that both eth0 on the guests when I do tcpdump-ing. Ping 
from guest 1 yield arp broadcast, but never get arp-reply...So, what is the 
workaround for this double MAC address problem?

regards

Mulyadi