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xen-users
Re: [Xen-users] Re: communication between dom0 and domu
On Saturday 03 September 2005 02:20, Marcus Brown wrote:
> Hi Arijit,
>
> Perhaps instead of a tun/tap device, try attaching a dummy to the
> bridge in dom0. You can even use multiple dummies if required with
> #modprobe -o dummy1
>
> Marcus.
>
Why would you want a dummy device attached to the bridge in dom0?
The bridge itself works as network device, so only attaching the domU's vifs
should be enough:
# brctl addbr test
# ifconfig test 192.168.77.77
# brctl show
bridge name bridge id STP enabled interfaces
test 8000.000000000000 no
## the "test" bridge has no interfaces attached.
# ifconfig test
test Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet addr:192.168.77.77 Bcast:192.168.77.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
## but it has an IP Address just fine.
# ping 192.168.77.77
PING 192.168.77.77 (192.168.77.77) 56(84) bytes of data.
64 bytes from 192.168.77.77: icmp_seq=1 ttl=64 time=0.079 ms
64 bytes from 192.168.77.77: icmp_seq=2 ttl=64 time=0.039 ms
--- 192.168.77.77 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.039/0.059/0.079/0.020 ms
## which works like a charm
So, where would you need a tun/tap or dummy device?
Usually, also the real eth devices bound to bridges in dom0 shouldn't be
configured with IP addresses, and the hosts ip-addr should be set on the
bridge device only. The xen network scripts don't remove the IP on eth0 when
they create a bridge, tho, so thats what might've confused you.
Hope that cleared things a bit,
/Ernst
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