Linux Network Setup (second edition)--linux network settings

LinuxNetwork Settings--Network configuration fileWith the commandNetwork configuration file

1./etc/sysconfig/network-scripts/ifcfg-eth0# "Save IP address and gateway"

[ set static IP]

ipaddr= new IP address # This option sets the IP address if bootproto=dhcp is set , automatically get IP address, there will be no option , otherwise bootproto=no

gateway= Gateway # Specify Gateway

broadcast= Broadcast Address

netmask= Subnet Mask

2,/etc/sysconfig/network#保存了本机主机名

Hostname= hostname # Specifies the host name, which is not available if DHCP Auto-assignment is specified because the hostname is localhost

3./etc/rc.d/init.d/network Start/stop/restart Network startup script

or service network restart

If a static IPis set, restart the system, or reload the following startup script, the settings will take effect, but recommend the latter!

4,/etc/hosts# saved the domain name database

5,/etc/services# Save the Network service information, such as: Port and transport Protocol

6./etc/resolv.conf# Specify DNS server address

nameserver [DNS server IP address ] #添加DNS server , plus spaces to specify multiple DNS server address, you can use up to 3 a

Attached- the service program may not use a fixed port, but generally the externally exposed WebServer will not change the port , but like SSH generally recommended changes, you can avoid scanning

Nmap [IP address ]# Scan the other host to enable those services, but he will only scan the port by default or a well-known service

 Network Management Commands

1.ifconfig# View network Port settings

Ifconfig eth0 up/down# start / close Nic

2,ethtool [NIC name]# detect network card line connection

Ethtool eth0

Ethtool Wlan0

Many times, a server will have more than one network card, at this time, theethtool command is very important!

3,arp# view arp table information, such as the previous

4.Ping# probe remote host

ping-c 10-s IP Address #-c Specifies the number of pings,-s specifies the size of the sending packet , pay attention to the packet loss rate at Ping pass

5.Route # Operation routing Table

Route add default GW 192.168.14.100# Add a gateway without modifying the configuration file

"But it's best to modify the configuration file"

"Zerba routing Software"

6.traceroute# View routing path

Traceroute www.163.com # He will list all the routers and delays that have passed while accessing this host .

7.netstat# monitor network status

netstat-an# View all connections

Netstat-an | grep:80# to see if the Apache service is started

Linux Network Setup (second edition)--linux network settings