en 1000
link/ether 9e:f8:c3:b9:af:ec brd ff:ff:ff:ff:ff:ff
- 为veth pair的两端分别配置ip
使用命令ip link set vethX up
和ip addr add 10.0.0.10/24 dev vethX
为veth pair配置ip,结果如下
# namespace 1
namespace ns1> ip link set veth0 up
namespace ns1> ip a
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
9: veth0@if10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 12:e8:a5:43:c0:43 brd ff:ff:ff:ff:ff:ff
namespace ns1> ip addr add 10.0.10.1/24 dev veth0
namespace ns1> ip a
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
9: veth0@if10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 12:e8:a5:43:c0:43 brd ff:ff:ff:ff:ff:ff
inet 10.0.10.x1/24 scope global veth0
valid_lft forever preferred_lft forever
# namespace 2
namespace n2>ip link set veth1 up
namespace n2>ip addr add 10.0.10/24 dev veth1
namespace n2>ip a
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
10: veth1@if9: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state LOWERLAYERDOWN group default qlen 1000
link/ether 9e:f8:c3:b9:af:ec brd ff:ff:ff:ff:ff:ff
inet 10.0.10.0/24 scope global veth1
valid_lft forever preferred_lft forever
- 测试两个namespace之间的网络联通状态
分别在n1和n2中尝试ping
namespace ns1> ping 10.0.10.0 -c 1
PING 10.0.10.0 (10.0.10.0) 56(84) bytes of data.
64 bytes from 10.0.10.0: icmp_seq=1 ttl=64 time=0.035 ms
namespace n2>ping 10.0.10.1 -c 1
PING 10.0.10.1 (10.0.10.1) 56(84) bytes of data.
64 bytes from 10.0.10.1: icmp_seq=1 ttl=64 time=0.040 ms
其拓扑结构如下
veth pair可以用于两个namespace之间的通信,但不适合用在多个namespace之间的通行
利用bridge通信
- 在以上实验基础上,重新创建两个namespace:n3、n4
root@mininet-vm:/home/mininet# ip netns add n3
root@mininet-vm:/home/mininet# ip netns add n4
root@mininet-vm:/home/mininet# ip netns ls
n4
n3
n1
n2
- 创建bridge
root@mininet-vm:/home/mininet# ip link add br0 type bridge
root@mininet-vm:/home/mininet# ip a
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
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:1e:27:79 brd ff:ff:ff:ff:ff:ff
inet 192.168.117.128/24 brd 192.168.117.255 scope global eth0
valid_lft forever preferred_lft forever
3: ovs-system: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default
link/ether 72:f5:e5:5d:4d:ed brd ff:ff:ff:ff:ff:ff
11: br0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default
link/ether 76:d8:06:1a:b9:84 brd ff:ff:ff:ff:ff:ff
- 利用veth pair将bridge与n3、n4、n1连通
创建3对veth pair
root@mininet-vm:/home/mininet# ip link add type veth
root@mininet-vm:/home/mininet# ip link add type veth
root@mininet-vm:/home/mininet# ip link add type veth
root@mininet-vm:/home/mininet# ip a
...
11: br0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default
link/ether 76:d8:06:1a:b9:84 brd ff:ff:ff:ff:ff:ff
12: veth0@veth1: <BROADCAST,M