Re: [Qemu-devel] Multiple Qemu Instances

[Laurent Vivier]

Hi,

you must provide different mac addresses for each qemu instance  with
"-net nic,macaddr=.... "

Laurent

Le lundi 20 octobre 2008 à 15:36 +0300, Volkan YAZICI a écrit :
> Hi,
> 
> While trying to run two qemu instances on a single server with a single
> NIC, I'm having network related problems. When I start the second qemu
> instance, ping'ing both servers concurrently works like below:
> 
>   ping 192.168.1.11                    ping 192.168.1.14
>   -------------------------------      -------------------------------
>   10 packets transmitted.             Waking up...
>   Packets get started to lost.        10 packets transmitted. (No loss.)
>   10 packets transmitted. (No loss.)  Packets get started to lost.
>   Packets get started to lost.        10 packets transmitted. (No loss.)
>   10 packets transmitted. (No loss.)  Packets get started to lost.
>   Packets get started to lost.        10 packets transmitted. (No loss.)
>   10 packets transmitted. (No loss.)  Packets get started to lost.
>   ...                                 ...
> 
> Related configurations are listed below.
> 
>   $ ifconfig -a 
>   br0       Link encap:Ethernet  HWaddr 00:1A:64:C1:94:3C
>             inet addr:192.168.1.10  Bcast:192.168.1.255  Mask:255.255.255.0
>             inet6 addr: fe80::21a:64ff:fec1:943c/64 Scope:Link
>             UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>             RX packets:57580386 errors:0 dropped:0 overruns:0 frame:0
>             TX packets:50256481 errors:0 dropped:0 overruns:0 carrier:0
>             collisions:0 txqueuelen:0
>             RX bytes:7292961440 (6.7 GiB)  TX bytes:28958593591 (26.9 GiB)
>   
>   eth0      Link encap:Ethernet  HWaddr 00:1A:64:C1:94:3C
>             inet6 addr: fe80::21a:64ff:fec1:943c/64 Scope:Link
>             UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>             RX packets:545421613 errors:0 dropped:0 overruns:0 frame:0
>             TX packets:508159417 errors:0 dropped:0 overruns:0 carrier:0
>             collisions:0 txqueuelen:1000
>             RX bytes:518992547535 (483.3 GiB)  TX bytes:386017012654 (359.5 
> GiB)
>             Interrupt:106 Memory:ce000000-ce011100
>   
>   tap0      Link encap:Ethernet  HWaddr 82:CE:FE:4D:9F:24
>             inet6 addr: fe80::80ce:feff:fe4d:9f24/64 Scope:Link
>             UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500 Metric:1
>             RX packets:74724106 errors:0 dropped:0 overruns:0 frame:0
>             TX packets:112203767 errors:0 dropped:0 overruns:0 carrier:0
>             collisions:0 txqueuelen:500
>             RX bytes:8410033346 (7.8 GiB)  TX bytes:151553233037 (141.1 GiB)
>   
>   tap1      Link encap:Ethernet  HWaddr A6:29:D5:36:3D:2E
>             inet6 addr: fe80::a429:d5ff:fe36:3d2e/64 Scope:Link
>             UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500 Metric:1
>             RX packets:139 errors:0 dropped:0 overruns:0 frame:0
>             TX packets:388 errors:0 dropped:0 overruns:0 carrier:0
>             collisions:0 txqueuelen:500
>             RX bytes:66530 (64.9 KiB)  TX bytes:123439 (120.5 KiB)
>   
>   $ cat /etc/qemu-ifup
>   #!/bin/sh
>   
>   IFACE=$1
>   
>   /sbin/ifconfig $IFACE 0.0.0.0 promisc up
>   /usr/sbin/brctl addif br0 $IFACE
>   
>   $ cat /etc/qemu-ifdown
>   #!/bin/sh
>   
>   IFACE=$1
>   
>   /sbin/ifconfig $IFACE 0.0.0.0 promisc down
>   /usr/sbin/brctl delif br0 $IFACE
> 
> I start qemu using a command similar to below
> 
>   /usr/local/bin/qemu-system-x86_64 ... -net nic -net tap
> 
> Does anybody have an idea about what might be causing the problem? How
> can I deploy two qemu instances sharing physically same NICs?
> 
> 
> Regards.
> 
> 
> 
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