# 7/tcp/udp - Pentesting Echo
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***
## 基本信息
此主机上正在运行一个回显服务。回显服务旨在用于测试和测量目的，可能同时在TCP和UDP协议上监听。服务器会原样发送接收到的任何数据。\
**通过将回显服务连接到同一台或另一台机器上的回显服务，可能会导致拒绝服务**。由于产生的数据包数量过多，受影响的机器可能会被有效地停止服务。\
信息来源：
**默认端口：** 7/tcp/udp
```
PORT STATE SERVICE
7/udp open echo
7/tcp open echo
```
### 联系回显服务（UDP）
```bash
nc -uvn 7
Hello echo #This is wat you send
Hello echo #This is the response
```
### Shodan
* `port:7 echo`
### 参考资料
[Wikipedia echo](http://en.wikipedia.org/wiki/ECHO_protocol)
[CA-1996-01 UDP Port Denial-of-Service Attack](http://www.cert.org/advisories/CA-1996-01.html)
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