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Hi all,

I'm running xen 2.0.6 with linux 2.6.8 in dom0 and domU. The machine has
two NICs - WiFi on network 192.168.157.0/25 and "wired" on
192.168.157.128/25. Dom0 uses .21 (dev wifi0) and .221 (dev wire0) and
can access router on over both channels on .1/.129. However when I start
up domU and assign addresses .41 to the interface bridged on wifi and
.241 to the other, only the wired network works. No luck with wifi.

For my tests I have manually created both bridges and set them in the
config file:

[/etc/xen/x1]
nics = 2
vif = ['mac=00:60:00:00:00:01, bridge=xbr0',
'mac=00:60:00:00:00:02, bridge=xbr1']

dom0:~# brctl show
bridge name bridge id STP enabled interfaces
xbr0 8000.004063d3d632 no wire0
vif6.0
xbr1 8000.0060b3656596 no wifi0
vif6.1

Addresses and routes are set the same way on both subnets (relevant parts):

dom0:~# ip addr show
2: wifi0: <BROADCAST,MULTICAST,NOTRAILERS,UP> mtu 1500 qdisc pfifo_fast
link/ether 00:60:b3:65:65:96 brd ff:ff:ff:ff:ff:ff
inet 192.168.157.21/25 brd 192.168.157.127 scope global eth0
22: wire0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast
link/ether 00:40:63:d3:d6:32 brd ff:ff:ff:ff:ff:ff
inet 192.168.157.221/25 brd 192.168.157.255 scope global wire
23: xbr0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
link/ether 00:40:63:d3:d6:32 brd ff:ff:ff:ff:ff:ff
inet 192.168.157.221/25 scope global xbr0
24: xbr1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
link/ether 00:60:b3:65:65:96 brd ff:ff:ff:ff:ff:ff
inet 192.168.157.21/25 scope global xbr1
27: vif6.0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff
28: vif6.1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff

dom0:~# ip route show
192.168.157.128/25 dev xbr0 proto kernel scope link src 192.168.157.221
192.168.157.0/25 dev xbr1 proto kernel scope link src 192.168.157.21

domU:~# ip addr show
# ip addr show
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:60:00:00:00:01 brd ff:ff:ff:ff:ff:ff
inet 192.168.157.241/25 brd 192.168.157.255 scope global eth0
3: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:60:00:00:00:02 brd ff:ff:ff:ff:ff:ff
inet 192.168.157.41/25 brd 192.168.157.127 scope global eth1

domU:~# ip route show
192.168.157.128/25 dev eth0 proto kernel scope link src 192.168.157.241
192.168.157.0/25 dev eth1 proto kernel scope link src 192.168.157.41

No firewall or MAC filtering is set up on any node.

When pinging from domU to the router on the wired subnet it just works.
OTOH when pinging on the wifi subnet I can observe the arp packets
"who-has 192.168.157.1 tell 192.168.157.41" going out on both xbr1 and
wifi0 but they don't arrive at the router, i.e. they are either sent out
malformed or not sent at all (I don't know). When pinging from the
router the arp request for .41 arrives to domU, but the response doesn't
reach the router. I.e. no outgoing traffic from domU over WiFi. Incoming
seems to work, dom0 works both ways.

FWIW the WiFi card on xen machine is Prism2.5/PCI with orinoco_pci
driver, tried both with and without WEP.

Does anyone have an idea on what could be wrong, workarounds, etc.?

Thanks!

Michal Ludvig
--
* Personal homepage: http://www.logix.cz/michal



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