(Linux VM virtual machine network connection failure, restart network card failure reasons and solutions)

osc_xrcp50yl 2020-11-10 11:27:38
linux vm virtual machine network

0 .vm Virtual machine under the network of three ways of connection

NAT Pattern Bridging mode Host only mode

( 1 ) NAT Pattern : Network address translation NAT Mode with virtual NAT Devices and virtual DHCP The server , Make virtual machines Networked , This is a VMware One of the most commonly used networking modes in , This connection uses VMnet8 Virtual switch . In the same place NAT The system in network mode passes through VMnet8 The switch communicates .NAT In the network mode IP Address 、 Subnet mask 、 Gateway and DNS Servers are all through DHCP The distribution of . The system in this mode uses virtual when communicating with the outside world NAT The server , therefore , Virtual machines don't have to have their own... In an external network IP Address . From the perspective of external network , Virtual machine and host are sharing one IP Address , By default , The external network terminal can not access the virtual machine .
(2 ) Bridging mode : It is to hand over the virtual network adapter of the virtual machine with the physical network adapter of the host , The virtual network adapter in the virtual machine can directly access the external network through the physical network adapter in the host , This pattern is also easy to understand , A system that chooses to use a bridging network is like a separate host in a local area network , It's as like as two peas , And it's also connected to this real network . So if you want this system to be networked , This system needs to be set up in the same way as the external real host , If you want to treat virtual machine as a completely independent computer , And allow it to communicate with other terminals in the same way , So bridging mode is usually the easiest way for virtual machines to access the network .
( 3 ) Host only mode : This pattern and NAT The pattern is similar , But it's more than NAT Mode more closed network connection mode , Even if the hosts in this networking mode are connected to each other , But the default is not connected to the external network , This is a network experiment ( Especially worms ) You don't have to worry about spreading to the outside .

Image theory :
NAT Virtual machines in mode , It's just a black household without a registered permanent residence , Router " Civil Affairs Bureau " I didn't know there was such a person , Nature will not actively communicate with it . Even if the virtual machine occasionally sends out point letters , All have to be forwarded to the host in the name of the host , The host also hired a special person called NAT Our boss is responsible for sending letters to these virtual machines 、 The receipt of the letter .

Virtual machines in bridge mode , It's like a router " Civil Affairs Bureau " Where? " I have been registered " Adults of , Have your own residential address , Although I live in the same yard as the host , But somehow it's people with registered permanent residence , You can communicate directly with the outside world .

Host only virtual machines , It's a total black slave , Not only is there no account 、 Router " Civil Affairs Bureau " I don't know such a person , It's also locked in a small black room by the main engine , Even letters are not allowed to be sent out .

1. vm Virtual machines and hosts don't have vmnet1 vmnet8 network card

 Insert picture description here

vmnet1: This is a Host Used with Host-Only Virtual network for communication -( Only host network card .
vmnet8: This is a Host Used with NAT Virtual network card for communication .-(Nat) Host and virtual machine IP The address is not in the same segment ,IP The address is virtual , Through the virtual network card to achieve broadcast
If you look at it and find vm The host of the virtual machine does not have vmnet1 vmnet8 ( Pictured above ) Network card configuration , But the basic configuration of the network card is correct , And the query start command is correct It's very likely that network And NetworkManager A conflict ( The most common reason )
resolvent : Ban NetworkManager

1  Temporarily disabled 
/etc/init.d/NetworkManager stop (centos6)
service NetworkManager stop (centos6)
systemctl stop NetworkManager (centos7)
chkconfig NetworkManager off (centos6)
systemctl disable NetworkManager (centos7)
2  Restart NIC 
service network restart( With centos 7 For example )

2 Network card configuration file error

(1) Edit network card profile :
vi /etc/sysconfig/network-scripts/ifcfg-eth33(160) [ Take bridge mode for example ]
 Insert picture description here

1.  As shown in the figure above : Open the network card configuration file , You can see the cursor flashing 
2.  Press the up and down keys of the keyboard , You can move the cursor .
3.  Move the cursor to the last line ( Keep pressing the key ) Of no After the word , Press the letter a key 
4.  Press the back button (backspace key ), Delete no, Change it to yes.
5.  Then press esc key , Exit insertion mode .
6.  In English input mode , Enter a colon (shift+ The colon )wq  And then go back 
7.  Exit file editing 

(2) Restart NIC
service network restart( With centos 7 For example )

Test whether the network is connected :ping www.baidu.com


// The next issue is vm Under the virtual machine centos7 Three kinds of network configuration detailed steps ( The bridge NAT Host only )


  1. 【计算机网络 12(1),尚学堂马士兵Java视频教程
  2. 【程序猿历程,史上最全的Java面试题集锦在这里
  3. 【程序猿历程(1),Javaweb视频教程百度云
  4. Notes on MySQL 45 lectures (1-7)
  5. [computer network 12 (1), Shang Xuetang Ma soldier java video tutorial
  6. The most complete collection of Java interview questions in history is here
  7. [process of program ape (1), JavaWeb video tutorial, baidu cloud
  8. Notes on MySQL 45 lectures (1-7)
  9. 精进 Spring Boot 03:Spring Boot 的配置文件和配置管理,以及用三种方式读取配置文件
  10. Refined spring boot 03: spring boot configuration files and configuration management, and reading configuration files in three ways
  11. 精进 Spring Boot 03:Spring Boot 的配置文件和配置管理,以及用三种方式读取配置文件
  12. Refined spring boot 03: spring boot configuration files and configuration management, and reading configuration files in three ways
  13. 【递归,Java传智播客笔记
  14. [recursion, Java intelligence podcast notes
  15. [adhere to painting for 386 days] the beginning of spring of 24 solar terms
  16. K8S系列第八篇(Service、EndPoints以及高可用kubeadm部署)
  17. K8s Series Part 8 (service, endpoints and high availability kubeadm deployment)
  18. 【重识 HTML (3),350道Java面试真题分享
  19. 【重识 HTML (2),Java并发编程必会的多线程你竟然还不会
  20. 【重识 HTML (1),二本Java小菜鸟4面字节跳动被秒成渣渣
  21. [re recognize HTML (3) and share 350 real Java interview questions
  22. [re recognize HTML (2). Multithreading is a must for Java Concurrent Programming. How dare you not
  23. [re recognize HTML (1), two Java rookies' 4-sided bytes beat and become slag in seconds
  24. 造轮子系列之RPC 1:如何从零开始开发RPC框架
  25. RPC 1: how to develop RPC framework from scratch
  26. 造轮子系列之RPC 1:如何从零开始开发RPC框架
  27. RPC 1: how to develop RPC framework from scratch
  28. 一次性捋清楚吧,对乱糟糟的,Spring事务扩展机制
  29. 一文彻底弄懂如何选择抽象类还是接口,连续四年百度Java岗必问面试题
  30. Redis常用命令
  31. 一双拖鞋引发的血案,狂神说Java系列笔记
  32. 一、mysql基础安装
  33. 一位程序员的独白:尽管我一生坎坷,Java框架面试基础
  34. Clear it all at once. For the messy, spring transaction extension mechanism
  35. A thorough understanding of how to choose abstract classes or interfaces, baidu Java post must ask interview questions for four consecutive years
  36. Redis common commands
  37. A pair of slippers triggered the murder, crazy God said java series notes
  38. 1、 MySQL basic installation
  39. Monologue of a programmer: despite my ups and downs in my life, Java framework is the foundation of interview
  40. 【大厂面试】三面三问Spring循环依赖,请一定要把这篇看完(建议收藏)
  41. 一线互联网企业中,springboot入门项目
  42. 一篇文带你入门SSM框架Spring开发,帮你快速拿Offer
  43. 【面试资料】Java全集、微服务、大数据、数据结构与算法、机器学习知识最全总结,283页pdf
  44. 【leetcode刷题】24.数组中重复的数字——Java版
  45. 【leetcode刷题】23.对称二叉树——Java版
  46. 【leetcode刷题】22.二叉树的中序遍历——Java版
  47. 【leetcode刷题】21.三数之和——Java版
  48. 【leetcode刷题】20.最长回文子串——Java版
  49. 【leetcode刷题】19.回文链表——Java版
  50. 【leetcode刷题】18.反转链表——Java版
  51. 【leetcode刷题】17.相交链表——Java&python版
  52. 【leetcode刷题】16.环形链表——Java版
  53. 【leetcode刷题】15.汉明距离——Java版
  54. 【leetcode刷题】14.找到所有数组中消失的数字——Java版
  55. 【leetcode刷题】13.比特位计数——Java版
  56. oracle控制用户权限命令
  57. 三年Java开发,继阿里,鲁班二期Java架构师
  58. Oracle必须要启动的服务
  59. 万字长文!深入剖析HashMap,Java基础笔试题大全带答案
  60. 一问Kafka就心慌?我却凭着这份,图灵学院vip课程百度云