linux 下怎樣檢視網路卡是否支援混雜(promisc)模式

From:http://blog.csdn.net/qiaoliang328/article/details/12708485
1，未設定支援promisc

[root@bogon libpcap-1.3.0]# ifconfig eth0
eth0: flags=4163  mtu 1500
        inet 192.168.1.18  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::20c:29ff:fe90:90e9  prefixlen 64  scopeid 0x20
        ether 00:0c:29:90:90:e9  txqueuelen 1000  (Ethernet)
        RX packets 1529593  bytes 116632252 (111.2 MiB)
        RX errors 0  dropped 13  overruns 0  frame 0
        TX packets 260  bytes 57720 (56.3 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

2，設定支援promisc

[root@bogon libpcap-1.3.0]# ifconfig eth0 promisc 

3，已設定支援promisc

[root@bogon libpcap-1.3.0]# ifconfig eth0
eth0: flags=4419PROMISC,MULTICAST>  mtu 1500
        inet 192.168.1.18  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::20c:29ff:fe90:90e9  prefixlen 64  scopeid 0x20
        ether 00:0c:29:90:90:e9  txqueuelen 1000  (Ethernet)
        RX packets 1534849  bytes 117018556 (111.5 MiB)
        RX errors 0  dropped 14  overruns 0  frame 0
        TX packets 262  bytes 58237 (56.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

4，設定不支援promisc

[root@bogon libpcap-1.3.0]# ifconfig eth0 -promisc