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We just installed CentOS 5.2 on a SuperMicro server and went to install a VM and the "share a physical network device" option had nothing that could be selected. I'm thinking that possibly it has to do with the peculiarities of the NICs in this box, maybe...

Before the domu is started:

# brctl show
bridge name     bridge id               STP enabled     interfaces
virbr0          8000.000000000000       yes
xenbr0          8000.feffffffffff       no              peth0
                                                        vif0.0

# /etc/xen/scripts/network-bridge status
============================================================
7: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
    link/ether 00:30:48:c4:55:fa brd ff:ff:ff:ff:ff:ff
    inet 204.87.213.163/24 brd 204.87.213.255 scope global eth0
    inet6 fe80::230:48ff:fec4:55fa/64 scope link
       valid_lft forever preferred_lft forever
14: xenbr0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue
    link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff

bridge name     bridge id               STP enabled     interfaces
virbr0          8000.000000000000       yes
xenbr0          8000.feffffffffff       no              peth0
                                                        vif0.0

204.87.xx.0/24 dev eth0 proto kernel scope link src 204.87.xx.163
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
169.254.0.0/16 dev eth0 scope link
default via 204.87.xx.1 dev eth0

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
204.87.xx.0    0.0.0.0         255.255.255.0   U     0      0        0 eth0
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth0
0.0.0.0         204.87.xx.1    0.0.0.0         UG    0      0        0 eth0
============================================================

After it is started:

# brctl show
bridge name     bridge id               STP enabled     interfaces
virbr0          8000.0a9c119ed9dd       yes             vif10.0
                                                        tap0
xenbr0          8000.feffffffffff       no              peth0
                                                        vif0.0

The odd thing I noticed, graphically in system-config-network actually, is that peth0 seems to be associated with eth1 instead of eth0. Might just be an oddity of how this graphical utility represents things, not sure. The eth0 hardware (according to this pointy-clicky tool) is e1000e and the eth1 hardware is "Intel Corporation 80003". Physically the eth0 interface has a cable and nothing in the other. Yet in the hardware tab of this tool it shows peth0 as being the "Intel Corporation 80003" hardware. Like it's linked to the physical eth1(?)

Since I couldn't select it initially I went ahead and completed the install with default networking then edited the config and changed the vif line to have ,bridge=xenbr0 instead of the ,bridge=virbr0,script=vif-bridge that was put in there automatically. In neither case is the domu successfully bridged though.

# lspci | grep -i eth
06:00.0 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper) (rev 01)
06:00.1 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper) (rev 01)

# grep -i eth /etc/modprobe.conf
alias eth0 e1000e
alias eth1 e1000e
alias peth0 e1000e

Thanks.

PS. I installed both another CentOS domu as well as a Windows XP one. On the XP one I got the newest compiled PV drivers and installed those. Afterwards I have both a Realtek and a Xen NIC defined in Windows. The Realtek one says it has a cable plugged in but the Xen one does not. Not sure if that's a symptom of the previous problem leaking through or if I did something wrong setting that up in Windows.

[Xen-users] Bridging