Re: [Qemu-discuss] How to use tap for qemu guest network?

Fri, 16 Dec 2016 00:15:38 -0800 

On the host:

Add "allow bridge0" line to /etc/qemu/bridge.conf.
Assign an IP to bridge and bring it up. I do it with NetworkManager, so I'm not sure which "ip x x" commands are needed, but the result looks like this (with VM not running): 

$ ip a l bridgevm
5: bridgevm: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000 
    link/ether ee:39:4b:c9:ba:ed brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global bridgevm
       valid_lft forever preferred_lft forever
    inet6 fe80::ec39:4bff:fec9:baed/64 scope link
       valid_lft forever preferred_lft forever
On the guest, OS must be able to work with virtio NIC and you'll have to assign static IP to it.
I struggled with host-only bridged network for Qemu/libvirt myself a little while ago and described my solution here, you may want to take a look: https://alekseikovura.blogspot.ru/2016/09/libvirt-and-networkmanagers-bridges.html 


/--Regards, Aleksei/

------------------------------------------------------------------------

*From:* Shiyao Ma
*Sent:* Friday, December 16, 2016 7:49AM
*To:* Aleksei
*Cc:* Qemu-discuss
*Subject:* Re: [Qemu-discuss] How to use tap for qemu guest network?
Hi Aleksei,

I did the following,

sudo ip link add dev bridge0 type bridge

sudo ip link set bridge0 up
# after the above commands, when doing a `ip link show', the bridge0 is in state UNKNOWN. 



I then run,
sudo kvm -m 256 eva.qcow2 -curses -vga virtio -device virtio-net,netdev=internet -netdev bridge,br=bridge0,id=internet,helper=/usr/lib/qemu/qemu-bridge-helper 

After login into the sytem, I run:
ip link show
I got:
    root@eva:/home/introom# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group defaul 
                                    t
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 <http://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 state UP gr 
                                    oup default qlen 1000
link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff inet 10.0.2.15/24 <http://10.0.2.15/24> brd 10.0.2.255 scope global eth0 valid_lft forever preferred_lft forever inet6 fec0::5054:ff:fe12:3456/64 scope site mngtmpaddr dynamic valid_lft 86343sec preferred_lft 14343sec inet6 fe80::5054:ff:fe12:3456/64 scope link valid_lft forever preferred_lft forever 



The above is all I got.

What additional step should I do?
For example, to achieve the goal as,  ping between the guest and the host.

Thanks.
On Thu, Dec 15, 2016 at 9:10 PM, Aleksei <[email protected] <mailto:[email protected]>> wrote: 

   This works for me (you have to set up the bridge "bridge0" on the
   host side):

   -device virtio-net,netdev=internet \
   -netdev
   bridge,br=bridge0,id=internet,helper=/usr/lib/qemu/qemu-bridge-helper


   /--Regards, Aleksei/

   ------------------------------------------------------------------------

   *From:* Shiyao Ma
   *Sent:* Thursday, December 15, 2016 3:34PM
   *To:* Qemu-discuss
   *Subject:* [Qemu-discuss] How to use tap for qemu guest network?

    Hi,

    I'd like to use a tap for the network between the host and the guest.

    There are some materials on the internet, but none working for me.

    Anybody successful setting up the tap based network?

    What commands/setup do you use?

    Thanks.







--

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