linux上网设置

1.网卡设置

命令

ifconfig eth0 192.168.0.100 broadcast 192.168.0.1 netmask 255.255.255.0

ifconfig eth0 down

ifconfig eth0 up

debian,unbuntu下的设置文件/etc/network/interfaces

# The loopback network interface
auto lo
iface lo inet loopback
#局域网dhcp:
# The primary network interface
#auto eth0
#iface eth0 inet dhcp
#局域网静态IP：
#iface eth0 inet static
#address 10.1.1.45
#gateway 10.1.1.1
#netmask 255.255.255.0
#无线网dhcp:
auto eth1
allow-hotplug eth1
iface eth1 inet dhcp
wireless-essid TENDA
wireless-key 1234567890

fedora平台下是/etc/sysconfig/network-scripts/ifcfg-eth0

# Marvell Technology Group Ltd. 88E8001 Gigabit Ethernet Controller
DEVICE=eth0
HWADDR=00:18:f3:c1:61:65
IPADDR=192.168.0.100
NETMASK=255.255.255.0
ONBOOT=yes
GATEWAY=219.136.254.254
TYPE=Ethernet
#/etc/init.d/network restart

2./etc/resolv.conf

该文件记录了dns的ip地址，可以有多个，如下所示：

yao@wuyao:~$ cat /etc/resolv.conf

nameserver 202.96.128.166

nameserver 202.96.128.86

nameserver 202.96.133.134

nameserver 192.168.198.22

nameserver 202.96.128.143

nameserver 202.96.128.132

nameserver 202.96.128.133

nameserver 61.144.56.101

nameserver 61.144.56.100

3./etc/hostname

该文件记录主机名

yao@wuyao:~$ cat /etc/hostname

wuyao

4./etc/hosts

hosts可以绑定一些IP，如下所示：

yao@wuyao:~$ cat /etc/hosts

127.0.0.1 localhost

192.168.0.111 wuyao

192.168.0.100 twomoon

192.168.0.1 gateway

220.181.27.48 baidu

64.233.189.104 google

203.208.37.104 g

220.181.28.51 163

这样在ping等命令的时就更简单了：

yao@wuyao:~$ ping gateway

PING gateway (192.168.0.1) 56(84) bytes of data.

64 bytes from gateway (192.168.0.1): icmp_seq=1 ttl=255 time=1.16 ms

64 bytes from gateway (192.168.0.1): icmp_seq=2 ttl=255 time=1.18 ms