UDP 和 TCP ping 是否有标准方法？
Is there a standard way for UDP and TCP pinging?
Ping 通常是通过 ICMP 完成的。我想测量 UDP 和 TCP 的实际延迟。我发现 PsPing 和 PingPlotter 有 TCP 和 UDP 模式，但我不知道它们是如何工作的。我是否需要某种回显服务器，或者是否有标准、RFC 等？
见hping3:
hping is a command-line oriented TCP/IP packet assembler/analyzer. The interface is inspired to the ping(8) unix command, but hping isn’t only able to send ICMP echo requests. It supports TCP, UDP, ICMP and RAW-IP protocols, has a traceroute mode, the ability to send files between a covered channel, and many other features.
Ping 通常是通过 ICMP 完成的。我想测量 UDP 和 TCP 的实际延迟。我发现 PsPing 和 PingPlotter 有 TCP 和 UDP 模式，但我不知道它们是如何工作的。我是否需要某种回显服务器，或者是否有标准、RFC 等？
见hping3:
hping is a command-line oriented TCP/IP packet assembler/analyzer. The interface is inspired to the ping(8) unix command, but hping isn’t only able to send ICMP echo requests. It supports TCP, UDP, ICMP and RAW-IP protocols, has a traceroute mode, the ability to send files between a covered channel, and many other features.