Linux Network configuration

• Routing Management Commands

View: Route-n

Add: Route add

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

Target: 192.168.1.3 Gateway: 172.16.0.1~]# Route add-host 192.168.1.3GW 172.16.0.1 Dev eth0

Target: 192.168.0.0 Gateway: 172.16.0.1~]# Route add-net 192.168.0.0 netmask 255.255.255.0 GW 172.16.0.1dev eth0

~] #route add-net 192.168.0.0/24 GW 172.16.0.1 Dev eth0

Default routing, Gateway: 172.16.0.1~]# Route add-net0.0.0.0 netmask 0.0.0.0 GW 172.16.0.1

~] #route Add default GW 172.16.0.1

Delete: Route del

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

Target: 192.168.1.3 Gateway: 172.16.0.1~] #route del-host 192.168.1.3

Target: 192.168.0.0 Gateway: 172.16.0.1~]# Route del-net192.168.0.0 netmask 255.255.255.0

• DNS server Specifies

/etc/resolv.conf

Nameserverdns_server_ip1

Nameserverdns_server_ip2

Nameserverdns_server_ip3

Positive solution: Fqdn-->ip

#dig-T A FQDN

#host-T A FQDN

Inverse solution: Ip-->fqdn

#dig-X IP

#host-T PTR IP

• Netstat

netstat [option]

-T:TCP protocol Related

-U:UDP protocol Related

-w:raw Socket Related

-L: In listening state

-A: all States

-N: Displays the IP and port numerically;

-E: Extended format

-P: Show related processes and PID

Common combinations:-tan,-uan,-TNL,-UNL

• IP command

IP [OPTIONS] OBJECT {COMMAND | help}

IP Address-protocol Address Management

IP Addr {add | del} ifaddr dev STRING

[Label label]: Indicates the NIC alias when adding an address

[Scope {Global|link|host}]: Indicates scope

Global: Globally available;

Link: only links are available;

Host: the machine is available;

[Broadcast address]: Specify broadcast addresses

IP address show-look at protocol addresses

[Dev DEVICE]

[Label PATTERN]

[Primary and secondary]

IP Address Flush-flush protocol addresses

Use format with show

IP route-routing Table Management

IP route add

Add route: IP route add TARGET via GW dev IFACE src source_ip

TARGET:

Host Routing: IP

Network routing: Network/mask

Add Gateway: IP route add defalt via GW Dev IFACE

IP route Delete

Delete route: IP route del TARGET

IP Route Show

IP Route Flush

[Dev IFACE]

[Via PREFIX]

• SS command

COMMAND:SS [OPTION] ... [FILTER]

-T:TCP protocol Related

-U:UDP protocol Related

-W: Bare Socket related

-x:unix Sock Related

-l:listen State of connection

-A: All

-N: Number format

-P: Related programs and PID

-E: Extended information

-M: Memory usage

-O: Timer information

• Network-related configuration files

IP, MASK, GW, DNS-related configuration files:/etc/sysconfig/network-scripts/ifcfg-iface

Routing-related configuration files:/etc/sysconfig/network-scripts/route-iface

Device: Devices to which this profile applies;

HWADDR: The MAC address of the corresponding device;

Bootproto: The address configuration protocol used when activating this device, commonly used DHCP, static, none, BOOTP;

NM_CONTROLLED:NM is the abbreviation of NetworkManager, whether the NIC accepts NM control, CentOS6 is recommended as "no";

Onboot: Whether this device is activated at system boot time;

Type: interface types; common Ethernet, Bridge;

UUID: The unique identification of the device;

IPADDR: Specify the IP address;

NETMASK: Subnet mask;

Gateway: Default gateways;

DNS1: The first DNS server points to;

DNS2: The second DNS server points to;

Userctl: Whether the ordinary user can control the device;

Peerdns: If the value of Bootproto is "DHCP", whether the DHCPServer assigned DNS server is allowed to direct the information to the/etc/resolv.conf file;

This article is from the "Qinnengbuzhuo" blog, make sure to keep this source http://echoroot.blog.51cto.com/11804540/1923093

Linux Network configuration