TCP/IP通讯第一步需要先调通ARP，否则TCP/IP包都不知道MAC地址要发给谁。这一篇来基于LWIP的ARP实现进行相关的分析。 硬件类型 ...

As I understand things... An ARP request is a system querying an IP address and asking for the MAC associated with that address. Routers and switches send to MACs not IPs (right?) so they need to know ...