Linux Network configuration ifconfig use of IP commands

The IP address belongs to the kernel, not the NIC. As long as the kernel has to be able to ping through.

Common types of network adapters:

Lo (loopback): local loopback.

Ethnum: Ethernet network card. CentOS7 in the ensnums.

Pppnum: Point-to-point.

To load a module configuration file:

/etc/modprobe.conf

In CentOS, only the/etc/modprobe.conf/folder can be created manually.

/etc/udev/rules.d/

#ifconfig [OPTION] [DEVICE] [ip/mask| IP MASK] [up|donw] Displays the status of the network card that is currently in use.

IP configured with this command will take effect immediately, but will fail if the service or host is restarted.

[OPTION]

-a displays the configuration parameters for all interfaces.

Network services:

Rhel5:/etc/init.d/network Start|stop|restart|status

Rhel6:/etc/init.d/networkmanager Start|stop|restart|status

Gateway:

#route [OPTION] Displays the routing table for the current system without any parameters.

As with Ipconfig, changes made after restarting the service or host are invalidated.

[OPTION]

Add

-host Host Routing

-net Network Routing

Del Delete

-host

-net

-n displays information such as hostname or port in digital form.

For example:

#route add-net 10.0.0.0/8 GW 192.168.10.1

#route del-net 10.0.0.0/8

Network configuration file:

The global file.

/etc/sysconfig/network

Information such as the gateway can also be defined in this file. However, the system will be a small range of whichever. The configuration of both network cards is higher than the global.

NIC configuration file:

The configuration file will not take effect immediately after it is modified, and will not take effect until the service or host is restarted.

/etc/sysconfig/network-scripts/ifcfg-internface_name

Common content is as follows:

Device=device the name of the associated device.

bootproto= static|bootp|dhcp|none Boot protocol.

ipaddr= IP Address IP addresses

netmask= NETMASK Subnet Mask

gateway= Gateway Gateways

onboot= On|off Whether this network interface is activated automatically.

Hwaddr= MAC address.

Userctl= yes|no allow normal user to control this interface

peerdns= Yes|no If the DNS address specified by the DNS server is accepted when Bootproto is DHCP.

Routing configuration file:

/etc/sysconfig/nework-scripts/route-device

Format 1:

DEST via Nexthop

For example:

192.168.2.0/24 via 10.0.0.1

Format 2;

addressnum=

netmasknum=

gatewaynum=

For example:

address0=192.168.10.0

nexthop0=255.255.255.0

gateway0=10.10.10.254

address1=192.168.20.0

netmask1=255.255.255.0

gateway1=10.10.20.254

DNS configuration file

/etc/resolv.conf

Fill up to 3 records.

If Bootprot is set to DHC in the network configuration file, setting Peerdns to No will prevent the DHCP server from overwriting the contents of this file.

Format:

NameServer DNS_IP

Local parsing file:

/etc/hosts

Format:

Host IP host name alias (can be omitted)

Parse Order:

/etc/hosts-->dns Cache-->dns Server

Configure host Name:

#hostname hostname effective immediately and fails after reboot.

To modify a configuration file:

Takes effect after restarting the service or host.

/etc/sysconfig/network

Hostname= HOSTNAME

Iproute2 Package

#ip

Link Network Interface Properties

Show view network interface address, equivalent to ifconfig-a.

-S Display Interface statistics

Set DEVICE sets the operating properties of the network interface

Addr Protocol Address

Add

Ipaddrss Dev DEVICE lable device:num

Del

IPADDRESS Dev DEVICE

Show Dev DEVICE

To PREFIX show matching criteria

For example:

#ip addr Show to 10/8 displays only the information that begins with 10.

Flush Dev DEVICE Empty address

For example:

#ip addr Flush Dev eth1 to 10/8 empties the address starting with 10.

Route routing

Show

To PREFIX

Flush

A single network card uses multiple addresses:

Use aliases:

#ifconfig Device:num Ipadd/netmask

/etc/sysconfig/network-scirpts/ifcfg-device:num

Device=device:num

Bootproto=static|none

Use the IP command:

#ip addr Add 192.168.1.22/24 eth1 lable eth1:3

#ip Addr Show

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Linux Network configuration ifconfig use of IP commands