Hi Zoltan,
I did the eth0 bridge to br0. As you explain i did the assignment the ip
from eth0 to the br0 interface. And is working I could ping between
interface from IP eth0 (br0) to VM and from VM to IP eth0. As well I tried
to configure my VM with the valid IP address and the connectivity loss until
I get back to the original configuration (dhcp).
Here is my ifconfig output:
br0 Link encap:Ethernet HWaddr 00:26:9E:XX:XX:XX
inet addr:208.66.XX.XX Bcast:208.66.XX.XX Mask:255.255.255.248
inet6 addr: fe80::226:9eff:fe82:5538/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8096 errors:0 dropped:0 overruns:0 frame:0
TX packets:10438 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:629208 (614.4 KiB) TX bytes:6818121 (6.5 MiB)
eth0 Link encap:Ethernet HWaddr 00:26:9E:XX:XX:XX
inet6 addr: fe80::226:9eff:fe82:5538/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:6768417 errors:0 dropped:0 overruns:0 frame:0
TX packets:1952736 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:9696354264 (9.0 GiB) TX bytes:305746274 (291.5 MiB)
Memory:df6e0000-df700000
eth0:1 Link encap:Ethernet HWaddr 00:26:9E:XX:XX:XX
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:468 (468.0 b)
Memory:df6e0000-df700000
eth1 Link encap:Ethernet HWaddr 00:26:9E:XX:XX:XX
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:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Memory:df660000-df680000
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:16436 Metric:1
RX packets:312493 errors:0 dropped:0 overruns:0 frame:0
TX packets:312493 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:188275585 (179.5 MiB) TX bytes:188275585 (179.5 MiB)
virbr0 Link encap:Ethernet HWaddr 52:54:00:ED:EC:C7
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:67131 errors:0 dropped:0 overruns:0 frame:0
TX packets:110832 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4087482 (3.8 MiB) TX bytes:163016646 (155.4 MiB)
vnet0 Link encap:Ethernet HWaddr FE:54:00:85:AE:AF
inet6 addr: fe80::fc54:ff:fe85:aeaf/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2735 errors:0 dropped:0 overruns:0 frame:0
TX packets:54661 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:292355 (285.5 KiB) TX bytes:2884496 (2.7 MiB)
Here is my brctrl show:
bridge name bridge id STP enabled interfaces
br0 8000.00269e825538 no eth0
virbr0 8000.525400edecc7 yes virbr0-nic
vnet0
Here is my vm network config (Windows Server 2003 Standard x64):
Windows IP Configuration
DHCP: Yes
IP Address: 192.168.122.77
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.122.1
DHCP Server: 192.168.122.1
DNS Server: 192.168.122.1
De: centos-virt-bounces at centos.org [mailto:centos-virt-bounces at centos.org]
En nombre de Zoltan Frombach
Enviado el: lunes, 09 de junio de 2014 01:03 a.m.
Para: Discussion about the virtualization on CentOS
Asunto: Re: [CentOS-virt] Network Bridgeing
You need to add eth0 to the bridge (br0) which you already did. But do NOT
assign an IP address to eth0. Instead, assign the host's IP to br0.
Then just use another of your IPs for your VM (which can also be called eth0
inside your VM).
This way your host and your VM(s) can communicate with each other via the
bridge.
Note: If you want to use more than one IP address to access your host, then
create alias interfaces on the host for the bridge such as br0:0, br0:1,
etc.
Do not create alias interfaces on eth0. Also do not create an alias
interface on your host for the IP(s) which you'll be using inside your
VM(s).
I hope this helps.
On 6/9/2014 2:30 AM, Ing. Ramon Resendiz wrote:
Hi,
I have the following issue i recently installed a VM with qemu and libvirtd,
everything is almost ok. The problem is that i have 5 usable IP address
(valid ip address on internet) for eth0, and i want to use one of this IP
for my VM (Windows 2008 Standard R2 by the way). I did the bridge between my
eth0 and br0, the VM could browse into internet and download patches, etc.
etc.
I tried to use a networking alias, this is the network interface eth0 assign
a IP address and for the eth0:1 assign other IP address, and this bridged to
the br0 instead of eth0 to eth0:1; after restart the network service the
connectivity lost, and then get in back the original configuration
everything seems to work again. But my goal is not archived.
Goal:
eth0 must have a valid ip address to be accesed, eth0:1 (bridged to br0)
must have a valid address to be assigned to the VM. Through iptables assign
ACL to each IP address (valid IP address) depending of the services to host
(web server and db server, rdp host) and between interfaces could be
possible to communicate between them (virtual host and virtual machine).
eth0: Virtual Host
eth0:1: Virtual machine (bridged to br0)
Thank you very much for you time.
Best regards,
RR
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