[Xen-users] Dom0 seeing traffic on br0 but it's not routing

["Glenn E. Bailey III" <replicant@xxxxxxxxxxxxxxxx>]

Hello,

I've beaten my head against the wall on trying to get bridging working
on a new dom0 install. I initially went  with CentOS 6 w/Xen 4.2 but
figured that the xl toolkit not being fully supported was the issue so
I went with SLES 11.3 and I'm having the same issue.

The issue is that appears to be that bridging isn't fully working as
the DomU can't ping anything *other* than the Dom0. When I do a
tcpdump on the DomU I can see the correct arp traffic that the Dom0
should be seeing, but I can't ping the gw on that network, again only
the Dom0 ip. Also, when I do a tcpdump on the Dom0 I can see the DomU
sending arp request trying to find the gw I'm trying to ping.

Some basic config info:

xen-den:~ # brctl show
bridge name    bridge id        STP enabled    interfaces
br0        8000.0025b50002fb    no        eth0

xen-den:~ # ifconfig # only br0 and eth0
br0       Link encap:Ethernet  HWaddr 00:25:B5:00:02:FB
          inet addr:10.157.209.8  Bcast:10.157.209.255  Mask:255.255.254.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:30071 errors:0 dropped:321 overruns:0 frame:0
          TX packets:3250 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1634697 (1.5 Mb)  TX bytes:18920997 (18.0 Mb)

eth0      Link encap:Ethernet  HWaddr 00:25:B5:00:02:FB
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:30050 errors:0 dropped:0 overruns:0 frame:0
          TX packets:15647 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2301897 (2.1 Mb)  TX bytes:19801909 (18.8 Mb)


xen-den:~ # route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         10.157.208.1    0.0.0.0         UG    0      0        0 br0
10.157.208.0    *               255.255.254.0   U     0      0        0 br0
loopback        *               255.0.0.0       U     0      0        0 lo

xen-den:~ # grep vif /etc/xen/centos.cfg
vif=["bridge=br0,model=e1000"]

Any ideas?

-- 
I've seen things you people wouldn't believe. Attack ships on fire off
the shoulder of Orion. I watched C-beams glitter in the dark near the
Tannhauser gate. All those moments will be lost in time... like tears
in rain... Time to die.

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