[Xen-users] Network Bridge Troubles

["Brendan P. Caulfield" <brendan@xxxxxxxxxxxx>]

Hi All,

I am in the process of migrating from VMWare to Xen but am having some 
serious issues with networking.  My setup is as follows:
I am running Xen 3.2 on Ubuntu 8.04.  The server, an HP DL380, has two 
NICs (expanding to 6 once I get bridging working).  I would like to run 
guest domains that will connect to separate physical VLANs.  As such, I 
would like to create a bridge for each physical NIC to present, as 
appropriate, to guest domains.  To this point, I have had very little luck 
with this.
I have read many tutorials about creating a custom network-bridge script 
and pointing to it in xend-config.sxp but each time I do this, networking 
on the entire box gets hosed and I need to get to the console, disable the 
custom script, and reboot before networking on the host will work again. 
I have also tried adding the second bridge manually by issuing:
/etc/xen/scripts/network-bridge start vifnum=1 netdev=eth1 bridge=xenbr1

This appears to create the bridge as evidenced by the output from 
brctl show:
eth0            8000.001cc4ee4958       no              peth0
xenbr1          8000.001cc4ee4956       no              peth1
                                                        tap0
                                                        vif14.0

and /etc/xen/scripts/network-bridge status:

============================================================
12: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
    link/ether 00:1c:c4:ee:49:58 brd ff:ff:ff:ff:ff:ff
    inet 10.1.5.128/24 brd 10.1.5.255 scope global eth0
    inet6 fe80::21c:c4ff:feee:4958/64 scope link
       valid_lft forever preferred_lft forever
12: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
    link/ether 00:1c:c4:ee:49:58 brd ff:ff:ff:ff:ff:ff
    inet 10.1.5.128/24 brd 10.1.5.255 scope global eth0
    inet6 fe80::21c:c4ff:feee:4958/64 scope link
       valid_lft forever preferred_lft forever

bridge name     bridge id               STP enabled     interfaces
eth0            8000.001cc4ee4958       no              peth0
xenbr1          8000.001cc4ee4956       no              peth1
                                                        tap0
                                                        vif14.0

10.1.5.0/24 dev eth0  proto kernel  scope link  src 10.1.5.128
default via 10.1.5.1 dev eth0  metric 100

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use 
Iface
10.1.5.0        0.0.0.0         255.255.255.0   U     0      0        0 
eth0
0.0.0.0         10.1.5.1        0.0.0.0         UG    100    0        0 
eth0
============================================================

OK, so this all looks promising.  I change my guest domain config to use 
xenbr1 but it just does not work.  Has anyone had any luck with a 
configuration like this?  It seems pretty simple to me.  Any advice or 
pointers to documentation that might be helpful would be very much 
appreciated.  Also, if helpful, I am very willing to provide additional 
information.
Thanks in advance for your time,

-brendan

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