Linux Network configuration

Linux Network Configuration

                                       (CENTOS6 CENTOS7)

Article One

The Ifconfig command is used to view and configure network devices. Network environment changes This command configures the network accordingly.

[[email protected] ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0device= "eth0"                   NIC interface bootproto= "DHCP"              -DHCP Dynamic Protocol   -static: Static protocol  -BOOTP protocol  hwaddr= "00:0C:29:AB:DC:D7"     network card MAC address nm_controlled= "yes"             whether the NIC accepts NetworkManager control; CentOS6 recommended "no" onboot= "yes"                    whether the gateway= "is loaded automatically when the system starts" 192.168.1.0 "         Nic Gateway address type=" Ethernet "                NIC Type ipaddr=192.168.1.107           Network card IP address (static protocol needs to be set) netmask=255.255.255.0          Network address (static protocol needs to be set) BROADCAst=192.168.1.255       network card broadcast address  uuid= "C05F7C37-2D21-4DB7-BE93-8A0DD2F661EC" [[ email protected] ~]# ifdown eth0    shut down the network [[email protected] ~]#  ifup eth0      Start Network [[email protected] ~]# service  network stop      shutting down network services [[email protected] ~]# service  network start     Start Network Service [[Email protected] ~]# service network  restart   Restart Network Services

The route command is used to display and manipulate the IP routing table (show/manipulate the IP routing table)

Route add [-net|-host] target [netmask Nm] [GW GW] [[Dev] If]

[Email protected] ~]# Route add-host 192.168.1.107 GW 172.16.0.1 Dev eth1

Route del [-net|-host] target [GW GW] [netmask Nm] [[Dev] If]

[Email protected] ~]# Route del-host 192.168.1.106[[email protected] ~]# route del-net 192.168.0.0 netmask 255.255.255. 0

Route-n Viewing the routing table

{DNS server specified}

[Email protected] ~]# vi/etc/resolv.conf# Generated by Networkmanagernameserver 10.10.10.1nameserver 192.168.1.1

netstat-print network connections, routing tables, interface statistics, masquerade connections, and multicast Memberships (shows network connections, routing tables, interface statistics, spoofed connections, and multicast members)

[[email protected] ~]# netstat -t       (TCP protocol Connection) Active  internet connections  (w/o servers) proto recv-q send-q local address                Foreign Address              State       TCP        0     52 192.168.1.105: ssh           192.168.1.102:55765          established [[email protected] ~]# netstat -u        (link to UDP protocol) active internet connections  (w/o servers) proto recv-q send-q local address                 foreign address             state       [[email protected] ~]# netstat -r         (Show routing table, similar to route or Ip route show) kernel ip routing  tabledestination     gateway          genmask         flags   mss window   irtt Iface192.168.1.0     *                255.255.255.0   U          0 0          0 eth1default          192.168.1.1     0.0.0.0          ug        0 0           0 eth1

-L: Listening status connection
-A: Connections for all States
-P: Connection-related processes
-N: Number format display

SS, used to replace Netstat (advantage of UDP) digest
Connection to the-T:TCP protocol
Links to the-U:UDP agreement
-L: Listening status connection
-A: Connections for all States
-E: Show extended information
-M: Displays memory information used by the socket connection
-P: Process and UDP
-N: Number format display
-O State (established)

Chapter Two

Configure Linux Network properties: IP command

              [[email protected]  ~]# ip -s link show1: lo: <loopback,up,lower_up> mtu 65536  qdisc noqueue state UNKNOWN     link/loopback  00:00:00:00:00:00 brd 00:00:00:00:00:00    rx: bytes  packets   errors  dropped overrun mcast       1312        24       0        0       0        0          tx: bytes  packets   errors  dropped carrier collsns     1312        24        0       0       0        0      2: eth1: < Broadcast,multicast,up,lower_up> mtu 1500 qdisc pfifo_fast state up qlen  1000    link/ether 00:0c:29:35:de:4e brd ff:ff:ff:ff:ff:ff     RX: bytes  packets  errors  dropped overrun  mcast       98128879   139122   0        0       0        0          TX: bytes  packets   errors  dropped carrier collsns     8388577     63333    0       0       0        0

[[Email protected] ~]# IP address [add|del] [IP parameters] [dev device name] [related parameters] parameter: Show: simply display the IP information of the device; Add|del: Add or delete the relevant parameter (add) (DEL) settings, mainly: IP parameters: The main is the network domain settings, such as 192.168.100.100/24 settings;

[[email protected] ~]#  ip addr add 4.4.4.4/32 dev eth1  Label eth1:zhong [[email protected] ~]# ip addr show eth12: eth1:  <broadcast,multicast,up,lower_up> mtu 1500 qdisc pfifo_fast state up  qlen 1000    link/ether 00:0c:29:35:de:4e brd ff:ff:ff:ff:ff:ff     inet 192.168.1.105/24 brd 192.168.1.255 scope global  Eth1    inet 2.2.2.2/24 scope global eth1    inet  3.3.3.3/32 scope global eth1:1    inet 4.4.4.4/32 scope  global eth1:zhong    inet6 fe80::20c:29ff:fe35:de4e/64 scope  Link        valid_lft forever preferred_lft forever

[[Email protected] ~]# IP route show <== simple display of routing settings [[email protected] ~]# IP route [add|del] [IP or domain] [via gateway] [Dev  Device][[email protected] ~]# IP route show2.2.2.0/24 Dev eth1 proto kernel scope link src 2.2.2.2 192.168.1.0/24 dev eth1 Proto kernel scope link src 192.168.1.105 metric 1 default via 192.168.1.1 dev eth1 proto static

Add routes that can be routed to the outside, via the route

Add default route IP route add default VIA[IP or domain] [dev Device]

Remove route IP route del [IP or domain]

"Takeaway"

  /etc/sysconfig/network-scripts/route-IFACE              Two styles of:                  (1)  TARGET via GW                  (2)   Define one route per three lines                      ADDRESS#=TARGET                     NETMASK#=mask                      GATEWAY#=GW         Configure multiple address:       for NIC       ifconfig:                 ifconfig IFACE_ALIAS              Ip                ip addr  add              configuration file:                 ifcfg-IFACE_ALIAS                      device=iface_alias             Note: The gateway alias cannot be booted using the DHCP protocol;     linux Network Properties configuration for TUI (text user interface):         system-config-network-tui         can also use Setup to find;          Note: Remember to restart the network service to be effective;     Configure the host name of the current host:         hostname [HOSTNAME]        /etc/sysconfig/network         HOSTNAME=     network interface identifies and names the associated udev configuration file:         /etc/udev/rules.d/70-persistent-net.rules          uninstall NIC driver:             modprobe  -r e1000         Load network card driver:             modprobe e1000

Article Three (CentOS7)

Address Configuration tool: Nmcli

(not to be continued)

This article is from the "Hotel California" blog, make sure to keep this source http://zhongshixun.blog.51cto.com/10314910/1691252

Linux Network configuration