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I am using CentOS 6.5 64 and use xen to create a virtual machine (CentOS)

ifconfig

[root@CentOS ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 08:00:27:54:B3:FA
          inet6 addr: fe80::a00:27ff:fe54:b3fa/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10087 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6094 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:763616 (745.7 KiB)  TX bytes:541789 (529.0 KiB)

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:5 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:560 (560.0 b)  TX bytes:560 (560.0 b)

vif2.0    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:32 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3969 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:2088 (2.0 KiB)  TX bytes:267825 (261.5 KiB)

xenbr0    Link encap:Ethernet  HWaddr 08:00:27:54:B3:FA
          inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe54:b3fa/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9896 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1892 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:613149 (598.7 KiB)  TX bytes:284945 (278.2 KiB)

brctl show

[root@CentOS ~]# brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.08002754b3fa       yes             eth0
                                                        vif2.0

xl network-list

[root@CentOS ~]# xl network-list xc
Idx BE Mac Addr.         handle state evt-ch   tx-/rx-ring-ref BE-path
0   0  00:16:3e:22:4f:4b     0     4     10   768/769         /local/domain/0/backend/vif/2/0

brctl showmacs xenbr0

[root@CentOS ~]# brctl showmacs xenbr0
port no mac addr                is local?       ageing timer
  2     00:16:3e:22:4f:4b       no                89.35
  1     00:1e:8c:19:62:67       no                 0.00
  1     00:22:6b:fe:b9:36       no                 4.92
  1     08:00:27:54:b3:fa       yes                0.00
  1     90:c1:15:c4:89:6d       no                25.00
  1     e0:2a:82:3d:c0:c5       no                 3.78
  2     fe:ff:ff:ff:ff:ff       yes                0.00

Ping

ping the virtual machine from same host

[root@CentOS ~]# ping 192.168.1.120
PING 192.168.1.120 (192.168.1.120) 56(84) bytes of data.
64 bytes from 192.168.1.120: icmp_seq=1 ttl=64 time=2.78 ms
64 bytes from 192.168.1.120: icmp_seq=2 ttl=64 time=0.916 ms
64 bytes from 192.168.1.120: icmp_seq=3 ttl=64 time=0.917 ms
^C
--- 192.168.1.120 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2370ms
rtt min/avg/max/mdev = 0.916/1.538/2.782/0.879 ms

ping the virtual machine from a device in local network

C:\Users\motaz>ping 192.168.1.120

Pinging 192.168.1.120 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.

iptables

[root@CentOS ~]#  iptables -L -v
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
   11   700 ACCEPT     all  --  any    any     anywhere             anywhere            state RELATED,ESTABLISHED
    0     0 ACCEPT     icmp --  any    any     anywhere             anywhere
    0     0 ACCEPT     all  --  lo     any     anywhere             anywhere
    0     0 ACCEPT     tcp  --  any    any     anywhere             anywhere            state NEW tcp dpt:ssh
    0     0 REJECT     all  --  any    any     anywhere             anywhere            reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
    0     0 ACCEPT     all  --  any    any     anywhere             anywhere            PHYSDEV match --physdev-is-bridged
    0     0 REJECT     all  --  any    any     anywhere             anywhere            reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT 8 packets, 864 bytes)
 pkts bytes target     prot opt in     out     source               destination

Any one who can give me an idea to solve this, i'll be grateful.

brctl showstp xenbr0

[root@CentOS images]# brctl showstp xenbr0
xenbr0
 bridge id              8000.080027798267
 designated root        8000.080027798267
 root port                 0                    path cost                  0
 max age                  20.00                 bridge max age            20.00
 hello time                2.00                 bridge hello time          2.00
 forward delay             2.00                 bridge forward delay       2.00
 ageing time             300.00
 hello timer               0.65                 tcn timer                  0.00
 topology change timer     0.00                 gc timer                 109.38
 hash elasticity           4                    hash max                 512
 mc last member count      2                    mc init query count        2
 mc router                 1                    mc snooping                1
 mc last member timer      1.00                 mc membership timer      260.00
 mc querier timer        255.00                 mc query interval        125.00
 mc response interval     10.00                 mc init query interval    31.25
 flags


eth0 (0)
 port id                0000                    state                forwarding
 designated root        8000.080027798267       path cost                  4
 designated bridge      8000.080027798267       message age timer          0.00
 designated port        8001                    forward delay timer        0.00
 designated cost           0                    hold timer                 0.00
 mc router                 1
 flags
share|improve this question
    
Could you please post the result of brctl showstp xenbr0 to see if the bridge is locked at learning state or is set to the forwarding state? –  nwildner Apr 25 at 20:00
    
Please check the update of question :) –  motaz Apr 28 at 16:53
    
I had a simmilar issue, where the eth0 got stuck at learning state. Guess ill have to make more research to help you. –  nwildner Apr 29 at 11:10
    
I lost hope .... –  motaz Apr 29 at 16:16

1 Answer 1

up vote 3 down vote accepted

First of all if you are using VirtualBox to host the XEN server please ensure to use Ethernet not Wireless network and set Promiscuous Mode to "Allow All".

Secondly just to make everything clean, let's start with clean installation of CentOS with XEN and install the Bridge Network and CentOS VM on it.

Assuming you have external server 192.168.1.6 with CentOS ISO extracted on /var/www/html/centos/6.3/os/i386/ and kickstart file on /var/www/html/centos/6.3/os/i386/ks.cfg and /var/www/html/centos/6.3/os/i386/repodata with correct names match names in repodata/TRANS.TBL file

On the XEN server (CentOS+XEN) install the following packages:

yum install -y rsync wget vim-enhanced openssh-clients
yum install -y libvirt python-virtinst libvirt-daemon-xen
yum install -y bridge-utils tunctl

Then edit ifcfg-* file to create the bridge

echo "DEVICE=br0
TYPE=Bridge
BOOTPROTO=dhcp
ONBOOT=yes" > /etc/sysconfig/network-scripts/ifcfg-br0

echo "DEVICE=eth0
HWADDR=XX:XX:XX:XX:XX:XX
ONBOOT=yes
TYPE=Ethernet
IPV6INIT=no
USERCTL=no
BRIDGE=br0" >  /etc/sysconfig/network-scripts/ifcfg-eth0

edit HWADDR=XX:XX:XX:XX:XX:XX line to match your MAC address. Don't reboot on ssh console, use VBox console

reboot

after reboot, assuming you have DHCP server the XEN server will got a new IP, login via VBox console to get the new IP

ifconfig result should be similar to

br0       Link encap:Ethernet  HWaddr 08:00:27:23:54:69  
          inet addr:192.168.1.105  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe23:5469/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5063 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3142 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:34251267 (32.6 MiB)  TX bytes:361205 (352.7 KiB)

eth0      Link encap:Ethernet  HWaddr 08:00:27:23:54:69  
          inet6 addr: fe80::a00:27ff:fe23:5469/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:149910 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5045 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:182020057 (173.5 MiB)  TX bytes:493792 (482.2 KiB)

Now the bridge is ready you can use the IP of br0 to get ssh console again

To create a virtual machine on XEN which use previous bridge:

cd /var/lib/xen/images/

Create virtual disk:

dd if=/dev/zero of=centos_1.img bs=4K count=0 seek=1024K
qemu-img create -f raw centos_1.img 8G 

Then use virt-install to create the VM:

virt-install -d -n TestVM1 -r 512 --vcpus=1 \
--bridge=br0 --disk /var/lib/xen/images/centos_1.img \
--nographics -p -l "http://192.168.1.6/centos/6.3/os/i386" \
--extra-args="text console=com1 utf8 console=hvc0 ks=http://192.168.1.6/centos/6.3/os/i386/ks.cfg"

Now the VM should start and be able to get IP from the DHCP server normally and able to complete unattended remote installation.

The ifconfig result on XEN should be similar to:

br0       Link encap:Ethernet  HWaddr 08:00:27:23:54:69  
          inet addr:192.168.1.105  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe23:5469/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10247 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8090 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:102264338 (97.5 MiB)  TX bytes:827859 (808.4 KiB)

eth0      Link encap:Ethernet  HWaddr 08:00:27:23:54:69  
          inet6 addr: fe80::a00:27ff:fe23:5469/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:998780 errors:0 dropped:0 overruns:0 frame:0
          TX packets:37992 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:724701715 (691.1 MiB)  TX bytes:2897912 (2.7 MiB)


vif5.0    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:37 errors:0 dropped:0 overruns:0 frame:0
          TX packets:67 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32 
          RX bytes:4381 (4.2 KiB)  TX bytes:9842 (9.6 KiB)

After the installation complete you can use xen console to get the IP of it, then you can have ssh console on it.

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