[libvirt-users] still possible to use traditional bridge network setup ?

[Lentes, Bernd]

Laine wrote:

> -----Original Message-----
> From: sendmail [mailto:justsendmailnothingelse at gmail.com] On Behalf
> Of Laine Stump
> Sent: Monday, March 16, 2015 4:12 PM
> To: libvirt-users at redhat.com
> Cc: Lentes, Bernd
> Subject: Re: [libvirt-users] still possible to use traditional bridge network
> setup ?
>
> On 03/16/2015 10:08 AM, Lentes, Bernd wrote:
> > Hi,
> >
> > i'm currently installing a SLES 12 64bit system. libvirt-client-1.2.5-
> 13.3.x86_64 and libvirt-daemon-1.2.5-13.3.x86_64.
> > Formerly I created my vm's (KVM) using a traditional bridge in my host
> systems, mostly SLES 11 SP3.
> > But with SLES 12 I don't succeed. I can use the macvtap device in the
> host, but I like to be able to communicate between host and guest.
> > Is the traditional bridge setup not any longer available ?
>
> Nothing has been removed in libvirt. Traditional bridges work just fine.
> What failure did you see?

Hi Laine,

thank you for your answer. Well, it simply does not work:

this is my setup:

pc63422:/etc/sysconfig/network # cat ifcfg-br0
BOOTPROTO='dhcp4'
TYPE='Bridge'
BRIDGE='yes'
DEVICE='br0'
BRIDGE_FORWARDDELAY='0'
BRIDGE_PORTS='eth0'
BRIDGE_STP='off'
BROADCAST=''
DHCLIENT_SET_DEFAULT_ROUTE='yes'
ETHTOOL_OPTIONS=''
IPADDR=''
MTU=''
NAME=''
NETMASK=''
NETWORK=''
REMOTE_IPADDR=''
STARTMODE='auto'
USERCONTROL='no

pc63422:/etc/sysconfig/network # cat ifcfg-eth0
# BOOTPROTO='dhcp'
BROADCAST=''
ETHTOOL_OPTIONS=''
IPADDR=''
MTU=''
NAME=''
NETMASK=''
NETWORK=''
REMOTE_IPADDR=''
STARTMODE='auto'
DHCLIENT_SET_DEFAULT_ROUTE='yes'
PREFIXLEN=''
BOOTPROTO='static'
USERCONTROL='no'
BRIDGE='br0'


guest.xml:
...
<interface type='bridge'>
      <mac address='52:54:00:37:92:b1'/>
      <source bridge='br0'/>
      <model type='rtl8139'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
...

pc63422:/etc/sysconfig/network # ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP group default qlen 1000
    link/ether 78:24:af:9c:bd:a6 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::7a24:afff:fe9c:bda6/64 scope link
       valid_lft forever preferred_lft forever
27: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 78:24:af:9c:bd:a6 brd ff:ff:ff:ff:ff:ff
    inet 10.35.34.115/24 brd 10.35.34.255 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::7a24:afff:fe9c:bda6/64 scope link
       valid_lft forever preferred_lft forever
28: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN group default qlen 500
    link/ether fe:54:00:37:92:b1 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc54:ff:fe37:92b1/64 scope link
       valid_lft forever preferred_lft forever


Attached is what I choose during creation of the vm. It's german, network source means something like "name of the shared device".

I attached the host to a network hub to be able to sniff all packets. But I don't see any packet from the guest. E.g. I choosed "dhclient" after booting a knoppix cd in the guest, but no packet from the guest. Also using a windows 7 installation cd - no packet from the guest. But I see packets from the host.




Bernd

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