root@falcon:/etc/network# ifconfig
eth0      Link encap:Ethernet  HWaddr 74:86:7a:ea:2e:e0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2617 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2311 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:623361 (608.7 KiB)  TX bytes:683497 (667.4 KiB)
          Interrupt:16
xenbr0    Link encap:Ethernet  HWaddr 74:86:7a:ea:2e:e0
          inet addr:192.168.0.254  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::7686:7aff:feea:2ee0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2548 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2325 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:558047 (544.9 KiB)  TX bytes:670173 (654.4 KiB)
xenbr0:0  Link encap:Ethernet  HWaddr 74:86:7a:ea:2e:e0
          inet6 addr: fe80::5889:1bff:fe54:cd63/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:47 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:7174 (7.0 KiB)
ip does not appear. But the network does the ping