Shulou(Shulou.com)06/01 Report--

IP address management

hostnamectl set-hostname s1.test.com

nmcli general hostname s1.test.com

nmcli device status

nmcli device show ens32

nmtui

nmcli help

Usage: nmcli [OPTIONS] OBJECT { COMMAND | help }

OPTIONS

-t[erse] terse output

-p[retty] pretty output

-m[ode] tabular|multiline output mode

-f[ields] |all|common specify fields to output

-e[scape] yes|no escape columns separators in values

-n[ocheck] don't check nmcli and NetworkManager versions

-a[sk] ask for missing parameters

-w[ait] set timeout waiting for finishing operations

-v[ersion] show program version

-h[elp] print this help

OBJECT

g[eneral] NetworkManager's general status and operations

n[etworking] overall networking control

r[adio] NetworkManager radio switches

c[onnection] NetworkManager's connections

d[evice] devices managed by NetworkManager

Note: network card command rules after centos 7

en Ethernet Ethernetwl Wireless local area network WLAN××× wireless wide area network WWANo on-board device index numbers hotplug slot index numberx MAC addressp PCI geograhical location/USB port number chain

Sequence number generated by system variable

Method modified to eth0 style

Edit/etc/default/grub and add "net.ifnames=0 biosdevname=0 "

grub2-mkconfig -o/boot/grub2/grub.cfg

command management

ifconfig

ifconfig eth2

ifconfig eth0 down

ifconfig eth0 up

ifconfig eth2 192.168.11.22 netmask 255.255.255.0 [ broadcast 192.168.11.255 ]

ifconfig eth0 192.168.11.10 netmask 255.255.255.0 [broadcast 255.255.255.0]

ifconfig eth0 hw ether 00:11:22:22:11:00

set the MAC address

ifconfig eth0:1 192.168.12.23 netmask 255.255.255.0

Add a child interface

ifconfig eth0 -arp

ifconfig eth0 arp

II. Route management route

1、route -n

display

2. Add routing

route add -net destination netmask x.gw next-hop route address

route add -net destination netmask x.x.x dev eth2

route add -net 172.18.11.0 netmask 255.255.255.0 gw 192.168.11.23

route add -host 172.18.11.67 gw 192.168.11.23 reject

route -host destination host gw next-hop route address

route add -host 172.18.11.67 gw 192.168.11.23

default gateway

route add default gw gateway address

route del default gw 192.168.11.23

delete a route

route del -net 172.18.11.0 netmask 255.255.255.0 gw 192.168.11.23

Third, command operation restart lost, forever saved setting method

1. Write these commands to/etc/rc.local;

2. Change the configuration file

Network card:

vi /etc/sysconfig/network-scripts/ifcfg-eth[0,1,2....]

DEVICE=eth2

TYPE=Ethernet

ONBOOT=yes

BOOTPROTO=static

IPADDR=192.168.91.20

NETMASK=255.255.255.0

#GATEWAY=192.168.91.1

Service network restart required to take effect (Note: Virtual machine to restart machine)

vi /etc/resolv.conf

nameserver 202.106.0.20

nameserver 222.222.222.222

routing

vi /etc/sysconfig/network-scripts/route-eth[0,1,2....]

192.168.30.0/24 via 192.168.91.10 dev eth2

or

192.168.30.0 netmask 255.255.255.0 via 192.168.91.10 dev eth2

IV. Command of network test

ping -c times 172.18.199.1

traceroute target detection route hops traversed

nslookup DNS detection resolution

arp -n detection arp analysis

Lab assignment:

1. Set up 2 LINUX servers. The first one has 2 network cards. Eth0 is the default network card of the system. No change is needed. Eth2 is 192.168. Student number. Student number;

The second machine has only one NIC, which is DHCP by default, and the IP address is added, 192.168. student number +100. student number. On the first machine, dynamic and static route addition methods are used to ping the sub-interface IP of the second machine.

Assignment:

1. Write a method to modify the IP address of centos 7.5;

2. Add the default gateway method.

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