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