{{tag>Network}}

= Linux Network Bridge

Voir :
* https://www.linux-kvm.org/page/Networking
* [[#MacVTap]]
* https://linuxfr.org/forums/linux-general/posts/fonctionnalite-tun-tap

Voir aussi :
* ebtables


== iproute2

Voir : 
* https://wiki.archlinux.org/index.php/Network_bridge
* https://baturin.org/docs/iproute2/

Création
<code bash>
ip link add br0 type bridge
ip link set br0 up

ip link set enp0s8 up
#ip addr flush enp0s8
ip link set enp0s8 master br0
</code>

Affichage et configuration
<code bash>
bridge link
bridge fdb show dev br0
bridge vlan show

ip addr add dev br0 192.168.56.11/24
</code>

Supression
<code bash>
ip addr flush br0
ip link set enp0s8 nomaster
#ip link set enp0s8 down
ip link del br0 type bridge
</code>


== brctl (deprecated)

brctl (deprecated). Use ''ip link'' instead

<code bash>
brctl show
</code>


== tunctl (deprecated). 

tunctl (deprecated). Use ''ip tuntap'' and ''ip link'' instead


== SystemD

Voir : https://wiki.archlinux.org/index.php/Systemd-networkd#Bridge_interface


== nmcli

<code bash>
nmcli connection add type bridge autoconnect yes con-name br0 ifname br0
nmcli con show
nmcli -f bridge con show br0
</code>

Disable STP
<code bash>
sudo nmcli con modify br0 bridge.stp no
</code>

Afficher la conf
<code bash>
nmcli con show
nmcli -f bridge con show br0
</code>

Pour ajouter, ou pour mettre une interface en esclavage
<code bash>
nmcli con add type bridge-slave ifname team0 master br0
</code>

ça va créer un fichier

''/etc/sysconfig/network-scripts/ifcfg-br0''
<code ini>
STP=no
TYPE=Bridge
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=br0
UUID=8ddf2382-7458-4f94-8986-40e95415ea20
DEVICE=br0
ONBOOT=yes
</code>

Un nouveau fichier est apparu

''/etc/sysconfig/network-scripts/ifcfg-bridge-slave-team0''
<code ini>
TYPE=Ethernet
NAME=bridge-slave-team0
UUID=93645ead-7177-4794-88f3-0a43c95bf179
DEVICE=team0
ONBOOT=yes
BRIDGE=br0
</code>


== RedHat

<code ->
     Edit /etc/sysconfig/network-scripts/ifcfg-eth0
        comment out BOOTPROTO
        Add BRIDGE=br0
    Create /etc/sysconfig/network-scripts/ifcfg-br0
        The content should be:

DEVICE=br0
BOOTPROTO=dhcp
ONBOOT=yes
TYPE=Bridge
</code>
Source : https://www.linux-kvm.org/page/Networking


== Debian

<code ->
/etc/network/interfaces

# Replace old eth0 config with br0
auto eth0 br0

# Use old eth0 config for br0, plus bridge stuff
iface br0 inet dhcp
    bridge_ports    eth0
    bridge_stp      off
    bridge_maxwait  0
    bridge_fd       0
</code>

Source : https://www.linux-kvm.org/page/Networking



== Macvlan

Voir :
* https://mghrepo.github.io/pse-mdbook/PSE_Res/virtualisation_reseau/macvlan.html


== MacVTap

Voir :
* https://www.furorteutonicus.eu/2013/08/04/enabling-host-guest-networking-with-kvm-macvlan-and-macvtap/
* https://virt.kernelnewbies.org/MacVTap
* https://www.ibm.com/support/knowledgecenter/en/linuxonibm/liaag/wkvm/wkvm_c_net_macvtap.htm
* https://www.ibm.com/support/knowledgecenter/linuxonibm/liaag/wehs/l0wehs00_kvmguestvirtnetconfusingmacvtap.htm
* https://www.flat-planet.net/?p=479
* https://www.fir3net.com/UNIX/Linux/what-is-macvtap.html
* https://linuxnatives.net/2012/virtualized-bridged-networking-with-macvtap
* https://suhu0426.github.io/Web/Presentation/20150120/index.html
* https://blog.scottlowe.org/2016/02/09/using-kvm-libvirt-macvtap-interfaces/
* http://www.math.cmu.edu/~gautam/sj/blog/20140303-kvm-macvtap.html
* https://events.static.linuxfound.org/sites/events/files/slides/2016%20-%20Linux%20Networking%20explained_0.pdf