(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)
 permanent 
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 )

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