[Xen-users] new xen guest cannot communicate with the network

[sbdcunha <guy20034u@xxxxxxxxx>]

Dear All,

I had this post earlier but just open a new one..
As I mentioned earlier the domu are not able to communicate to other
computers except dom0
let me explain
had a fresh new installation of Centos 6.5 x64 minimul edition working fine.
installed xen 4.3 . the install went fine and no issues
the server is a Cisco UCS 200 M3 Blade Servers with 2 NICs
ifconfig shows the below
--------
[root@xenserver2 scripts]# ifconfig
br0       Link encap:Ethernet  HWaddr 00:25:B5:01:00:0C  
          inet addr:aa.aa.aa.126  Bcast:172.16.2.255  Mask:255.255.255.0
          inet6 addr: fe80::225:b5ff:fe01:c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:407445 errors:0 dropped:1845 overruns:0 frame:0
          TX packets:46 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:27709516 (26.4 MiB)  TX bytes:2728 (2.6 KiB)

br1       Link encap:Ethernet  HWaddr 00:25:B5:01:00:0D  
          inet addr:bb.bb.bb.54  Bcast:91.198.134.63  Mask:255.255.255.224
          inet6 addr: fe80::225:b5ff:fe01:d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:556949 errors:0 dropped:1843 overruns:0 frame:0
          TX packets:129246 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:466519471 (444.9 MiB)  TX bytes:39497349 (37.6 MiB)

eth0      Link encap:Ethernet  HWaddr 00:25:B5:01:00:0C  
          inet6 addr: fe80::225:b5ff:fe01:c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:407445 errors:0 dropped:0 overruns:0 frame:0
          TX packets:54 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:36673306 (34.9 MiB)  TX bytes:3988 (3.8 KiB)

eth1      Link encap:Ethernet  HWaddr 00:25:B5:01:00:0D  
          inet6 addr: fe80::225:b5ff:fe01:d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:773573 errors:0 dropped:0 overruns:0 frame:0
          TX packets:137373 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:494827266 (471.9 MiB)  TX bytes:40644498 (38.7 MiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:38031 errors:0 dropped:0 overruns:0 frame:0
          TX packets:38031 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:25724657 (24.5 MiB)  TX bytes:25724657 (24.5 MiB)

vif4.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF  
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:70 errors:0 dropped:0 overruns:0 frame:0
          TX packets:195770 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32 
          RX bytes:2960 (2.8 KiB)  TX bytes:16697344 (15.9 MiB)

virbr0    Link encap:Ethernet  HWaddr 7E:59:9C:79:56:E5  
          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

------
route on dom0 shows me
---------
[root@xenserver2 scripts]# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
default         bb.bb.bb.62   0.0.0.0         UG    0      0        0 br1
bb.bb.bb.32   *               255.255.255.224 U     0      0        0 br1
link-local      *               255.255.0.0     U     1004   0        0 br0
link-local      *               255.255.0.0     U     1005   0        0 br1
aa.aa.aa.0      *               255.255.255.0   U     0      0        0 br0
192.168.122.0   *               255.255.255.0   U     0      0        0
virbr0
---------------
Now from the DOM0 server i can ping the gateway which is bb.bb.bb.62 and
also my network computers which are on different networks. and also internet

brctl shows
----
bridge name     bridge id               STP enabled     interfaces
br0             8000.0025b501000c       no              eth0
br1             8000.0025b501000d       no              eth1
                                                                    vif4.0
virbr0          8000.000000000000       yes
-----

Now I created a new dom U selecting bridge br1 and assigned a ip address of
bb.bb.bb.55. now I can ping the DOM0 br1 ip that is bb.bb.bb.54. but if I
try to ping the dom0 gateway that is bb.bb.bb.62 i cannot pint it neither
any computer on the network

then I also tried to create a new domU and selected the interface as virtual
network default : NAT and then from this domU everythings works perfect.
i can ping the gateway that is bb.bb.bb.62 and also any computer on our
network and also internet works fine

Really would appreciate your kind help in troubleshooting.


Thanks nd regards


simon








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