我正在做一个无线实验，它使用了一个 tp-link 路由器 WR1043ND 闪存 OpenWrt 系统。因为需要通过路由器抓包，所以需要安装tcpdump软件。
我刚刚使用命令“opkg install tcpdump”安装它，终端显示安装成功。
但是当我输入“tcpdump”命令时，我得到一个失败提示，显示
-ash：tcpdump：未找到
所以我试着知道是否安装了 tcpdump。我输入如下：
opkg 列表 | grep tcpdump
过滤后的结果显示：
openvswitch-ovs-tcpdump - 2.8.1-1 - Dump traffic from an Open vSwitch port using tcpdump
openvswitch-ovs-tcpundump - 2.8.1-1 - Convert ``tcpdump -xx`` output to hex strings
pcapsipdump - 0.2-1 - pcapsipdump is a tool for dumping SIP sessions (+RTP traffic, if available) to disk in a fashion similar to "tcpdump -w" (format is exactly the same), but one file per sip session (even if there is thousands of concurrect SIP sessions).
tcpdump - 4.9.2-1 - Network monitoring and data acquisition tool
tcpdump-mini - 4.9.2-1 - Network monitoring and data acquisition tool (minimal version)
tcpreplay - 4.2.5-1 - tcpreplay is a tool for replaying network traffic from files saved with tcpdump or other tools which write pcap(3) files.
很明显，安装成功了。我真的希望有人能帮助我处理这个问题，谢谢！