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Linux下网卡混杂模式设置和取消

分类:linux系统 作者:默然 评论:0 点击: 348 次 日期:2016-07-23

1、Linux下网卡常用的几种模式说明:
广播方式:该模式下的网卡能够接收网络中的广播信息。
组播方式:设置在该模式下的网卡能够接收组播数据。
直接方式:在这种模式下,只有目的网卡才能接收该数据。
混杂模式:在这种模式下的网卡能够接收一切通过它的数据,而不管该数据是否

2、查看、添加和取消混杂模式
a、查看网卡模式
[root@zabbix ~]# ifconfig -a
ens32: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.203.12.88  netmask 255.255.255.0  broadcast 10.203.12.255
        inet6 fe80::250:56ff:feb3:2253  prefixlen 64  scopeid 0x20<link>
        ether 00:50:56:b3:22:53  txqueuelen 1000  (Ethernet)
        RX packets 2800921171  bytes 2087772292594 (1.8 TiB)
        RX errors 0  dropped 61583  overruns 0  frame 0
        TX packets 2328391024  bytes 1651122431491 (1.5 TiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 287928092  bytes 25694088025 (23.9 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 287928092  bytes 25694088025 (23.9 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
         
b、添加ens32网卡的混杂模式
[root@zabbix ~]# ifconfig ens32 promisc
[root@zabbix ~]# ifconfig -a
ens32: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
        inet 10.203.12.88  netmask 255.255.255.0  broadcast 10.203.12.255
        inet6 fe80::250:56ff:feb3:2253  prefixlen 64  scopeid 0x20<link>
        ether 00:50:56:b3:22:53  txqueuelen 1000  (Ethernet)
        RX packets 2800927421  bytes 2087779226027 (1.8 TiB)
        RX errors 0  dropped 61585  overruns 0  frame 0
        TX packets 2328394266  bytes 1651123460792 (1.5 TiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 287929365  bytes 25694221536 (23.9 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 287929365  bytes 25694221536 (23.9 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
         
c、除去ens32网卡的混杂模式
[root@zabbix ~]# ifconfig ens32 -promisc
[root@zabbix ~]# ifconfig -a
ens32: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.203.12.88  netmask 255.255.255.0  broadcast 10.203.12.255
        inet6 fe80::250:56ff:feb3:2253  prefixlen 64  scopeid 0x20<link>
        ether 00:50:56:b3:22:53  txqueuelen 1000  (Ethernet)
        RX packets 2800929338  bytes 2087779370583 (1.8 TiB)
        RX errors 0  dropped 61607  overruns 0  frame 0
        TX packets 2328396280  bytes 1651123608090 (1.5 TiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 287931015  bytes 25694392926 (23.9 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 287931015  bytes 25694392926 (23.9 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

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