該主機上正在運行一個echo服務。echo服務用於測試和測量目的，可以監聽TCP和UDP協議。服務器發送回它接收到的任何數據，不做任何修改。
通過將回聲服務連接到同一台或另一台機器上的回聲服務，可能會導致拒絕服務。由於產生的數據包數量過高，受影響的機器可能會有效地停止服務。
參考 https://www.acunetix.com/vulnerabilities/web/echo-service-running/
默認端口: 7/tcp/udp
PORT STATE SERVICE
7/udp open echo
7/tcp open echo
nc -uvn <IP> 7
Hello echo #This is wat you send
Hello echo #This is the response
port:7echo
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