在linux下比较方便：
先添加一个vlan接口
#vconfig add eth0 10
再抓包
# tcpdump -i eth0 -n -e
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
13:44:45.069868 3c:97:0e:57:8c:e1 > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 10, p 0, ethertype ARP, Request who-has 192.168.10.2 tell 192.168.10.1, length 28
显示 802.1q ,vlan号是20
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