veth pair

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http://heychenbin.github.io/post/veth-pair/

Virtual Ethernet Pair简称veth pair,是一个成对的端口,所有从这对端口一端进入的数据包都将从另一端出来,反之也是一样.

下面用例子说明veth pair的创建和使用:

现在有这样一个环境,两个网桥,一个是Linux内核网桥br1,另一个是ovs网桥 br-eth1,现在想把两个网桥连接起来,就可以用veth pair.

+------------------+              +------------------+|                  |              |                  ||   ovs bridge     |              |   Linux bridge   ||   br-eth1        |              |   br1            ||                  |              |                  |+------------------+              +------------------+

首先创建一对veth pair:

[root@compute-195 ~]# ip link add eth1-br1 type veth peer name phy-br1[root@compute-195 ~]# ip link list...25: phy-br1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000    link/ether 22:83:01:db:37:b4 brd ff:ff:ff:ff:ff:ff26: eth1-br1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000    link/ether 32:b2:aa:1a:8a:13 brd ff:ff:ff:ff:ff:ff

创建成功后,可以通过ip link看到一对端口,可以通过ethtool查看他们是否成对:

[root@compute-195 ~]# ethtool -S phy-br1NIC statistics:     peer_ifindex: 26

创建成功后,就可以分别将两个端口添加到不同的网桥上:

Linux网桥

[root@compute-195 ~]# brctl addif br1 phy-br1[root@compute-195 ~]# brctl showbridge name     bridge id               STP enabled     interfacesbr0             8000.e41f136dc9f0       no              enp11s0f0                                                        vnet0                                                        vnet2                                                        vnet3br1             8000.deef26d9c76a       no              phy-br1                                                        vnet1                                                        vnet4

可以看到phy-br1添加到了br1网桥上.

ovs网桥

[root@compute-195 ~]# ovs-vsctl add-port br-eth1 eth1-br1[root@compute-195 ~]# ovs-vsctl showe61b93e6-a701-4b6e-86c2-05f883885ab8    Bridge br-int        fail_mode: secure        Port "qvof01b51bf-71"            tag: 1            Interface "qvof01b51bf-71"        Port "int-br-eth1"            Interface "int-br-eth1"        Port br-int            Interface br-int                type: internal    Bridge "br-eth1"        Port "eth1-br1"            Interface "eth1-br1"        Port "eth1"            Interface "eth1"        Port "phy-br-eth1"            Interface "phy-br-eth1"        Port "br-eth1"            Interface "br-eth1"                type: internal    ovs_version: "2.3.0"

可以看到eth1-br1也添加到了br-eth1网桥上了.这样整个网络就完成了网桥的连接:

+------------------+              +------------------+|  ovs bridge      |              |   Linux bridge   ||  br-eth1         |              |   br1            ||       +----------+              +----------+       ||       | eth1-br1 +--------------+ phy-br1  |       |+-------+----------+              +----------+-------+

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