Sorry, that there is a tiny mistake of the ip. In comp2,
  The problem is that in comp1, i can ping from the domainU to domain0, also i can ping from domain0 on comp1 to comp2, however, i couldn't no ping from domainU in comp1 to comp2.   
  I have tried to btctl  add xenbr0 eth1 in comp1, but it do no help too. 
    hi
 friends,
   
  I have two physical computers  : comp1 and comp2
   
  in comp1,  i installl sarge as domainU.    comp1 has two netcards, 
  eth0 is connected with internet using dhcp
  eth1 is conencted with comp2 with ip 192.168.100.254
  xenbr0 with ip 192.168.0.254  
  domainU sarge ip is 192.168.0.1
   
  comp2,  sarge as domainU too, comp2 has two netcards.  
  eth1 is connected with comp1 with ip 192.168.100.1
  eth0 is idle
  xenbr0 with ip 192.168.1.254
  domainU sarge ip is 192.168.1.1
   
  Now in comp1 or comp2, i can ping from domainU to base host and vice versa. 
  For example, in computer1, when i create domainU, i can ping physical eh0 192..168.100.254 and xenbr0 192.168.0.254.  However, i couldn't ping
 comp2.
   
  That's i can access base host but i couldn't get outside.
   
   
  ifconfig on basehost
  ----------------------------------------------------------------------------------------
  eth0      Link encap:Ethernet  HWaddr 00:04:61:98:AC:87
          inet addr:***.***.***.***  Bcast:***.***.***.***  Mask:255.255.255.192
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:254571 errors:0 dropped:0 overruns:0 frame:0
          TX packets:134525 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0
 txqueuelen:0
          RX bytes:225259931 (214.8 MiB)  TX bytes:10101144 (9.6 MiB)
  eth1      Link encap:Ethernet  HWaddr 00:0E:0C:A0:03:DE
          inet addr:192.168.100.254  Bcast:192.168.100.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1364978 errors:0 dropped:0 overruns:0 frame:0
          TX packets:622795 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1642611613 (1.5 GiB)  TX bytes:323191171 (308.2
 MiB)
          Base address:0xac00 Memory:fdea0000-fdec0000
  lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:77 errors:0 dropped:0 overruns:0 frame:0
          TX packets:77 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:5680 (5.5 KiB)  TX bytes:5680 (5.5 KiB)
  peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST
 RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:264212 errors:0 dropped:0 overruns:0 frame:0
          TX packets:134633 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:229023582 (218.4 MiB)  TX bytes:10106624 (9.6 MiB)
          Interrupt:17 Base address:0x2000
  vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:134525 errors:0 dropped:0 overruns:0 frame:0
          TX packets:254571
 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:10101144 (9.6 MiB)  TX bytes:225259931 (214.8 MiB)
  xenbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet addr:192.168.0.254  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:85844 errors:0 dropped:0 overruns:0 frame:0
          TX packets:90 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:7746842 (7.3 MiB) 
 TX bytes:3780 (3.6 KiB)
   
   
  route on basehost
  _________________________________________________________
  # route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
150.203.24.192  *               255.255.255.192 U     0      0        0 eth0
192.168.100.0   *               255.255.255.0   U     0      0        0 eth1
192.168.0.0    
 *               255.255.255.0   U     0      0        0 xenbr0
default         xxx.xxx.xxx.xxx 0.0.0.0         UG    0      0        0 eth0
   
   
  domainU interface
  ____________________________________________________________
   
  # Used by ifup(8) and ifdown(8). See the interfaces(5) manpage or
# /usr/share/doc/ifupdown/examples for more information.
        auto lo
        iface lo inet loopback
          auto
 eth0
        iface eth0 inet static
                address 192.168.0.1
                netmask 255.255.255.0
                gateway 192.168.0.254
                broadcast 192.168.0.255
    
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