Linux查询子网掩码网关DNS

##查询IP和子网掩码
[root@pfzhang3 ~]# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:0C:29:33:2B:D8  
          inet addr: 192.168.0.102  Bcast:192.168.0.255  Mask: 255.255.255.0
          inet6 addr: fe80::20c:29ff:fe33:2bd8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:335 errors:0 dropped:0 overruns:0 frame:0
          TX packets:130 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:45418 (44.3 KiB)  TX bytes:15915 (15.5 KiB)


lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:36 errors:0 dropped:0 overruns:0 frame:0
          TX packets:36 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2448 (2.3 KiB)  TX bytes:2448 (2.3 KiB)


pan0      Link encap:Ethernet  HWaddr 1A:36:CD:39:B5:A1  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)






##查询默认网关
[root@pfzhang3 ~]# netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.0.0     0.0.0.0         255.255.255.0   U         0 0          0 eth0
0.0.0.0         192.168.0.1     0.0.0.0         UG        0 0          0 eth0
[root@pfzhang3 ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     0.0.0.0         255.255.255.0   U     1      0        0 eth0
0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0        0 eth0




##查询DNS
[root@pfzhang3 ~]# cat /etc/resolv.conf 
# Generated by NetworkManager
nameserver 61.132.163.68
nameserver 202.102.213.68




##配置网卡参数
[root@pfzhang3 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 
DEVICE=eth0
HWADDR=00:0C:29:33:2B:D8
TYPE=Ethernet
UUID=a4a40b33-4da4-4cfd-aaa0-2cd60bb2329c
ONBOOT= yes
NM_CONTROLLED=yes
BOOTPROTO= static
IPADDR=192.168.0.102
NETMASK=255.255.255.0
GATEWAY=192.168.0.1
DNS1=61.132.163.68
DNS2=202.102.213.68




##重启网卡服务
[root@pfzhang3 ~]# service network restart
Shutting down interface eth0:  Device state: 3 (disconnected)
                                                           [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:  Active connection state: activated
Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/2
                                                           [  OK  ]