1、Linux下網卡常用的幾種模式說明：
廣播方式：該模式下的網卡能夠接收網絡中的廣播信息。
組播方式：設置在該模式下的網卡能夠接收組播數據。
直接方式：在這種模式下，只有目的網卡才能接收該數據。
混雜模式：在這種模式下的網卡能夠接收一切通過它的數據，而不管該數據是否
2、查看、添加和取消混雜模式
a、查看網卡模式
[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網卡的混雜模式
[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網卡的混雜模式
[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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