[Xen-users] bridge networking issue from dom0 to the world

[Con Hennessy <con.hennessy@xxxxxxxxxx>]

Hi,
  I'm trying to setup xen and have figured out most of my issues. However I'm 
stuck with a networking issue.

From my dom0 I can ping the world and my domU. However I cannot ping anything 
except the dom0 from inside my domU.

dom0 is a clean opensuse 11.4 with XEN 4.1.1 added to it (using the default 
kernel 2.6.37.6-0.5-xen).

domU is ubuntu server 8.04 with all recent updates (and using the kernel 
above).

I've manually setup the xen cfg for my domU (xen-create-tool was not available 
on SuSE and I could not seem to get virt-manager to do what I wanted - or made 
sence of it :( ).

After starting up domU the dom0 config looks like :
# ifconfig
br0       Link encap:Ethernet  HWaddr <MAC>
          inet addr:x.y.z.117  Bcast:x.y.z.127  Mask:255.255.255.224
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1166 errors:0 dropped:0 overruns:0 frame:0
          TX packets:733 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:85307 (83.3 Kb)  TX bytes:112363 (109.7 Kb)

eth0      Link encap:Ethernet  HWaddr <MAC>
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1133 errors:0 dropped:0 overruns:0 frame:0
          TX packets:828 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:100941 (98.5 Kb)  TX bytes:117725 (114.9 Kb)
          Interrupt:230 Base address:0x8000 

vif2.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF  
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:22 errors:0 dropped:0 overruns:0 frame:0
          TX packets:41 errors:0 dropped:4 overruns:0 carrier:0
          collisions:0 txqueuelen:32 
          RX bytes:1296 (1.2 Kb)  TX bytes:2718 (2.6 Kb)

vif2.1    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF  
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:43 errors:0 dropped:4 overruns:0 carrier:0
          collisions:0 txqueuelen:32 
          RX bytes:0 (0.0 b)  TX bytes:2886 (2.8 Kb)

# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.4061862a1fa4       no              eth0
                                                        vif2.0
                                                        vif2.1

# route -n

Kernel IP routing table
Destination     Gateway      Genmask         Flags Metric Ref    Use Iface
x.y.z.97     0.0.0.0         255.255.255.255 UH    0      0        0 eth0
x.y.z.96     0.0.0.0         255.255.255.224 U     0      0        0 br0
127.0.0.0    0.0.0.0         255.0.0.0       U     0      0        0 lo
0.0.0.0      x.y.z.97        0.0.0.0         UG    0      0        0 br0


# cat /etc/sysctl.conf
net.ipv4.ip_forward=1
net.ipv4.conf.all.rp_filter=1
net.ipv4.icmp_echo_ignore_broadcasts=1

# cat /etc/xen/xend-config.sxp | grep -v <empty lines and comments>
(xend-http-server yes)
(xend-unix-server yes)
(xend-unix-path /var/lib/xend/xend-socket)
(xend-port            8000)
(xend-address localhost)
(xend-relocation-hosts-allow '^localhost$ ^localhost\\.localdomain$')
(network-script 'network-bridge bridge=br0')
(vif-script vif-bridge)
(dom0-min-mem 512)
(enable-dom0-ballooning yes)
(total_available_memory 0) 
(dom0-cpus 0)

The dom0 has no iptables rules active.

Finally the domU looks like :
# route -n
Kernel IP routing table
Destination     Gateway         Genmask      Flags Metric Ref    Use Iface
x.y.z.96        0.0.0.0      255.255.255.224 U     0      0        0 eth0
0.0.0.0         x.y.z.97     0.0.0.0         UG    100    0        0 eth0
0.0.0.0         x.y.z.117    0.0.0.0         UG    100    0        0 eth0

#ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:.....  
          inet addr:x.y.z.125  Bcast:x.y.z.127  Mask:255.255.255.224
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:54 errors:0 dropped:0 overruns:0 frame:0
          TX packets:75 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:3644 (3.5 KB)  TX bytes:5975 (5.8 KB)

Thanks for any pointers or insights you may have.
CPH

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