[Qemu-devel] problems: running two instance of Qemu with same MAC address

[Mulyadi Santosa <a_mulyadi@softhome.net>]

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