标签：00 ip 技术 veth lft 64 ff link
veth peer技术
文章目录
前言
veth peer 技术简而言之就是创建两个接口，将这两个接口放在两个原本不能互通的地方启用后，就可以互通了。
创建一个命名空间
使用ip netns命令 --建议可以查看帮助文档了解此命令
ip netns add zhang
[root@hoyeong ~]# ip netns add zhang
[root@hoyeong ~]# ip netns list
zhang
##进阶理解
[root@hoyeong ~]# cd /var/run/netns/
[root@hoyeong netns]# ls
zhang
#命名空间的文件路径在/var/run/netns/
#也可以通过创建文件夹和做软链接的方式创建命令空间-要复杂一点
创建veth接口
使用ip link命令 --可以查看帮助文档学习此命令。
ip link add veth0 type veth peer name veth1
Garbage instead of arguments "peer ...". Try "ip link help".
[root@hoyeong ~]# ip link add veth0 type veth peer name veth1
[root@hoyeong ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:df:3a:a1 brd ff:ff:ff:ff:ff:ff
inet 192.168.200.130/24 brd 192.168.200.255 scope global noprefixroute dynamic ens33
valid_lft 1560sec preferred_lft 1560sec
inet6 fe80::fe8f:a78a:691f:6e62/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: ens34: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:df:3a:ab brd ff:ff:ff:ff:ff:ff
4: veth1@veth0: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether de:54:d8:db:23:3e brd ff:ff:ff:ff:ff:ff
5: veth0@veth1: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 9e:0e:06:a0:ab:57 brd ff:ff:ff:ff:ff:ff
将其中一个接口放入命名空间
1、添加veth
ip link set veth1 netns zhang
link/ether 9e:0e:06:a0:ab:57 brd ff:ff:ff:ff:ff:ff
[root@hoyeong ~]# ip link set veth1 netns zhang
[root@hoyeong ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:df:3a:a1 brd ff:ff:ff:ff:ff:ff
inet 192.168.200.130/24 brd 192.168.200.255 scope global noprefixroute dynamic ens33
valid_lft 1531sec preferred_lft 1531sec
inet6 fe80::fe8f:a78a:691f:6e62/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: ens34: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:df:3a:ab brd ff:ff:ff:ff:ff:ff
5: veth0@if4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 9e:0e:06:a0:ab:57 brd ff:ff:ff:ff:ff:ff link-netnsid 0
2、查看zhang命令空间内部的网络信息
ip netns exec zhang ip link list
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
4: veth1@if5: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether de:54:d8:db:23:3e brd ff:ff:ff:ff:ff:ff link-netnsid 0
[root@hoyeong ~]# ip link
配置命名空间中的接口地址
使用ifconfig命令，需要下载网络工具–注意yum的配置
yum install -y net-tools
[root@hoyeong ~]# yum install -y net-tools
Loaded plugins: fastestmirror
Determining fastest mirrors
* base: mirrors.ustc.edu.cn
* extras: mirrors.ustc.edu.cn
* updates: mirrors.neusoft.edu.cn
base | 3.6 kB 00:00:00
extras | 2.9 kB 00:00:00
updates | 2.9 kB 00:00:00
(1/4): base/7/x86_64/group_gz | 153 kB 00:00:00
(2/4): extras/7/x86_64/primary_db | 242 kB 00:00:00
(3/4): base/7/x86_64/primary_db | 6.1 MB 00:00:01
(4/4): updates/7/x86_64/primary_db | 8.8 MB 00:00:01
Resolving Dependencies
--> Running transaction check
---> Package net-tools.x86_64 0:2.0-0.25.20131004git.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
===========================================================================================================================================================================================================================================
Package Arch Version Repository Size
===========================================================================================================================================================================================================================================
Installing:
net-tools x86_64 2.0-0.25.20131004git.el7 base 306 k
Transaction Summary
===========================================================================================================================================================================================================================================
Install 1 Package
Total download size: 306 k
Installed size: 917 k
Downloading packages:
warning: /var/cache/yum/x86_64/7/base/packages/net-tools-2.0-0.25.20131004git.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Public key for net-tools-2.0-0.25.20131004git.el7.x86_64.rpm is not installed
net-tools-2.0-0.25.20131004git.el7.x86_64.rpm | 306 kB 00:00:00
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Importing GPG key 0xF4A80EB5:
Userid : "CentOS-7 Key (CentOS 7 Official Signing Key) <security@centos.org>"
Fingerprint: 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5
Package : centos-release-7-7.1908.0.el7.centos.x86_64 (@anaconda)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : net-tools-2.0-0.25.20131004git.el7.x86_64 1/1
Verifying : net-tools-2.0-0.25.20131004git.el7.x86_64 1/1
Installed:
net-tools.x86_64 0:2.0-0.25.20131004git.el7
Complete!
配置地址-注意要使用同一个网段
ip netns exec zhang ifconfig veth1 192.168.200.2/24 up
[root@hoyeong ~]# ip netns exec zhang ip a
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
4: veth1@if5: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state LOWERLAYERDOWN group default qlen 1000
link/ether de:54:d8:db:23:3e brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 10.1.0.2/24 brd 10.1.0.255 scope global veth1
valid_lft forever preferred_lft forever
测试连接
ping 192.168.200.2
[root@hoyeong ~]# ping 192.168.200.2
PING 192.168.200.2 (192.168.200.2) 56(84) bytes of data.
64 bytes from 192.168.200.2: icmp_seq=1 ttl=128 time=0.217 ms
64 bytes from 192.168.200.2: icmp_seq=2 ttl=128 time=0.108 ms
64 bytes from 192.168.200.2: icmp_seq=3 ttl=128 time=0.326 ms
64 bytes from 192.168.200.2: icmp_seq=4 ttl=128 time=0.216 ms
^C
--- 192.168.200.2 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3000ms
rtt min/avg/max/mdev = 0.108/0.216/0.326/0.079 ms
标签：00,ip,技术,veth,lft,64,ff,link 来源： https://blog.csdn.net/m0_56363537/article/details/118282406
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