TCPDump报错WARNING:can'tgetTPACKET_V2headerlenonpacketsocket:Operationnotsupported

在Linux系统上，使用TCPDump进行网络数据包捕获时，有可能会出现上述报错。这是因为TCPDump试图使用Linux kernel 3.0版本之后才引入的一种新的数据包捕获机制TPACKET_V2，但是该机制并不兼容早期版本的Linux kernel，所以就会出现操作不支持的报错。

解决该问题的方法是，可以在命令行中指定使用旧的数据包捕获机制，如下所示：

sudo tcpdump -i eth0 -s 0 -w output.pcap -C 32 -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root -Z root