Network, network card and IP configuration

VMware Network configuration on

1. bridge Bridging mode

A switch is connected between the virtual machine and the real machine ,
IP The address is in the same network segment

2. network

A routing machine is connected between the virtual machine and the real machine ,
IP The address is not in the same network segment

3. HostOnly

The virtual machine has nothing to do with the real machine

Linux Check out the Internet 、 see IP Wait for the order

1. Write a message to the user write

write  Online user name 
 Content 1
 Content 2

//ctrl+D  Save information 

2. Send a broadcast message wall

wall  Content 

// All online users can receive 

3. Send E-mail

mail  user name 

Read mail

mail

 Parameters 
d： Delete mail 
h： Look at the list 
q： sign out 

4. View the login and logout information of all users

1、last
2、astlog

List all users , Including users who cannot log in

lastlog -u  User uid

// View users individually 

5. Network command netstat

netstat

 Parameters 
-t：TCP agreement 
-U：UDP agreement r I
-1： monitor 
-r： route 
-n： Show IP Address and port number 

 Example :
netstat -tlun  // View the port that this machine is listening to 
netstat -an   // View all network connections on this computer 
netstat -rn   // View the local routing table 

6. Configure the network setup（redhat Proprietary command ）

- see IP Address ：

ifconfig

ip addr show 

- View the network card profile

ls /etc/sysconfig/network-scripts/

Important parameter :
TYPE=Ethernet/bridge： Pick up A type
BOOTPROTO=dhcp/static/none： After activating this interface , What protocol to use
ONBOOT=yes/no： Whether the boot is activated
DNS1=8.8.8.8： Set main DNS
DNS2=9.9.9.9： Set attachments DNS
IPADDR=192. 168.1.100： Set up |P Address |
PREFIX= 24：centQS Set mask
GATEWAY=192.168.1.254： Set up the gateway
NAME=static： Administrator's name
DEVICE=ens37 ： Device name

- Restart the service

systemctl restart network 

Linux Manual configuration IP Address

A graphical Linux When the server
A minimum Linux When the client

• Graphical Linux Manual configuration IP Address

• To minimize the Linux Manual configuration IP Address

1. Graphical configuration

nmtui  

2. Command configuration

nmcli command

// List the current network card devices 
nmcli connection show
// see  ens33  Details of the network card 
nmcli connection show'ens33'

// Set up DNS
nmcli connection modify  network card  ipv4.dns 8.8.8.8 
// Add one more DNS
nmcli connection modify  network card  + ipv4.dns 9.9.9.9 
// modify IP Address addresses, And gateway  gw4
umcli connection modify  network card  ipv4 addresses 192.1 68.1.100/24 gw4 192.168.1.254 

You also need to add a command

umcli connection down  network card 
umcli connection up  network card 
systemctl restart network

NIC teaming

The physical network card is always broken , To ensure the continuity of work , We need to bind the two physical network cards together

Redhat7 Use in teamd Daemon to complete

teamd： The following procedures can be used to run :

• Five ways of polymerization

1、broadcast

Transmit every packet from all ports , Send a package , Every port （ Up and down ） Send one packet each

2、roundrobin

Transmit packets from each port in a round robin fashion , send out 10 A package , Every port （ Up and down ） Send each 5 A package

3、activebackup The aggregation of red hat learning

Failover run program , Monitor link changes and select the active port for
The data transfer .( The main line can't go , Running standby line )

4、loadbalance

Monitor traffic and use hash functions to try to achieve perfect balance when selecting ports for packet transmission . Reduce busy line transmission

5、lacp

The implementation of 802.3ad Link aggregation control protocol .

Network card aggregation steps

nmcli Commands can be used to create and manage groups and port interfaces , There are five steps :

1. Create an interface group

nmcli connection add type  team con-name lewis ifname lewis config '{
    "runner":{
    "name":"activeback"}}'

 first lewis： Is the name of the reference connection ;
 the second lewis： Is the interface name ;
JSON  Is to specify the running program to be used : {
    "runner":{
    "nam"."METHOD"}'

2. Identify the interface group ipv4/6 Properties of

1、 Must first assign ipv4.addresses, Then we can set ipv4.method manual
2、 Yes DHCP The server may not be configured

// To configure IP Address 
nmcli connection modify lewis ipv4.addresses 192.169.1.1/24
// To configure 
nmcli connection modify lewis ipv4.method manual

3. Assign ports to interfaces

nmcli connection add type team-slave con-name p1 ifname ens37 master lewis

nmcli connection add type team-slave con-name p2 ifname ens38 master lewis

4. start-up / Close the group interface and port interface

nmcli connection up lewis

5. see team The state of

teamdctl lewis state

Configuration is successful , Two fast network cards become one network card

DNS- domain name

DNS： effect : take IP Address and WWW The domain name of the . Users don't need to remember IP Address , Just remember the domain name .

IP There are two kinds of mapping relationship between address and domain name

1、 Static mapping , Each device maintains its own mapping table , Only for the use of this equipment
2、 Dynamic mapping , build DNS The server , Configure... On this server WWW Domain name and IP Address mapping

• Check the domain name of this machine

hostname

• Modify the local domain name

1、 Temporary modification

 hostname  New local domain name 

2、 permanent :

 Modify the native file : vim /etc/hostname
 Command to change : hostnamectl set- hostname  New local domain name