KVM Guest - Networking problem

Discussion in 'Server Operation' started by satimis, Dec 10, 2009.

  1. satimis

    satimis Member

    Hi folks,


    KVM
    Host - Debian 5.0
    VM (Guest) - Ubuntu 9.10
    One NIC


    I ran following command to create the guest (VM).

    $ sudo virt-install --connect qemu:///system -n vm30ubuntu910 -r 512 --vcpus=2 -f /home/satimis/VM/vm30ubuntu910.qcow2 -s 12 -c /home/satimis/Desktop/mini_ubuntu9.10.iso --vnc --noautoconsole --os-type linux --accelerate --network=bridge:br0 --hvm


    It went through without problem. Guest can contact Internet with following settings on /etc/network/interfaces
    Code:
    
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp

    The above settings was created automatically during installation.


    I tried setting following static IP without success;
    Code:
    
# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet manual

auto br0
iface br0 inet static
        address         192.168.0.30
        netmask         255.255.255.0
        network         192.168.0.0
        broadcast       192.168.0.255
        gateway         192.168.0.1
        bridge_ports    eth0
        bridge_fd       9
        bridge_hello    2
        bridge_maxage   12
        bridge_stp      off

    Internet can't be connected.


    On guest;

    sudo ifconfig eth0 :-
    Code:
    eth0    Link encap: Ethernet  HWaddr 54:52:00:07:69:c8
    Broadcase multicast  MTU:1500  Metric:1
    RX packets:0 errors:0 dropped:0 ovrruns:0 frame:0
    TX packets:0 errors:0 dropped:0 ovrruns:0 carrier:0   
    collisions:0 txqueuelen:1000
    RX bytes:0 (0.0 B)  TX bytes:0 (0.0.B)
    Interrupt:10

    $ netstat -rn :-
    Code:
    Kernel IP routing table
Destination  Gateway  Genmask  Flags  MSS Window  irtt  Iface

    complete ip route from host

    $ ip route
    Code:
    
192.168.0.0/24 dev br0  proto kernel  scope link  src 192.168.0.10
192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1
default via 192.168.0.1 dev br0

    complete ip route from guest

    $ ip route
    Code:
    192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.49
default via 192.168.0.1 dev eth0  metric 100

    complete ip link from host

    $ ip link
    Code:
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:0e:a6:f9:a3:5b brd ff:ff:ff:ff:ff:ff
3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether 00:0e:a6:f9:a3:5b brd ff:ff:ff:ff:ff:ff
4: virbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether fa:cc:db:5d:a5:63 brd ff:ff:ff:ff:ff:ff
5: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500
    link/ether 00:ff:95:46:91:b5 brd ff:ff:ff:ff:ff:ff
6: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500
    link/ether 00:ff:00:13:7d:6d brd ff:ff:ff:ff:ff:ff
7: vnet2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500
    link/ether 00:ff:e9:57:bf:64 brd ff:ff:ff:ff:ff:ff

    complete ip link from guest

    $ ip link
    Code:
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 54:52:00:07:69:c8 brd ff:ff:ff:ff:ff:ff

    On host

    $ sudo brctl show
    Code:
    
bridge name    bridge id        STP enabled    interfaces
br0        8000.000ea6f9a35b    no        eth0
                            vnet0
                            vnet1
                            vnet2
virbr0        8000.000000000000    yes

    Please help. TIA


    Edit:

    I found out the cause in running following command on VM (Guest)

    $ sudo /etc/init.d/networking restart
    Code:
     * Reconfiguring network interfaces...                                     
 * if-up.d/mountnfs[eth0]: waiting for interface br0 before doing NFS mounts
SIOCSIFADDR: No such device
br0: ERROR while getting interface flags: No such device
SIOCSIFNETMASK: No such device
SIOCSIFBRDADDR: No such device
br0: ERROR while getting interface flags: No such device
br0: ERROR while getting interface flags: No such device
Failed to bring up br0.
                                                                   [ OK ]
    IIRC I met this problem sometimes ago. I had it fixed later unfortunate I have no recollection. Any advice? Thanks


    B.R.
    satimis
     
    Last edited: Dec 10, 2009
    satimis, Dec 10, 2009
    #1
  2. torusturtle

    torusturtle Member

    Check if you have either the file
    /etc/iftab

    or
    /etc/udev/rules.d/70-persistent-net.rules (or similar)

    The mac address in the file should be the same as you have configured for the kvm vm.
     
    torusturtle, May 8, 2010
    #2
  3. satimis

    satimis Member

    Hi torusturtle,

    Thanks for your advice.

    I fixed my problem already. IIRC it needs bridge-utils installed on the guest as well.


    B.R.
    satimis
     
    satimis, May 8, 2010
    #3

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