hacktricks/network-services-pentesting/7-tcp-udp-pentesting-echo.md

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# Temel Bilgiler
Bu hostta bir echo servisi çalışıyor. Echo servisi test ve ölçüm amaçları için tasarlanmıştır ve hem TCP hem de UDP protokollerinde dinleyebilir. Sunucu aldığı verileri, herhangi bir değişiklik yapmadan geri gönderir.\
**Aynı veya başka bir makinedeki echo servisine bağlanarak hizmet reddi (denial of service) oluşturmak mümkündür**. Üretilen aşırı yüksek paket sayısı nedeniyle, etkilenen makineler etkili bir şekilde hizmet dışı kalabilir.\
Bilgi için [https://www.acunetix.com/vulnerabilities/web/echo-service-running/](https://www.acunetix.com/vulnerabilities/web/echo-service-running/)
**Varsayılan Port:** 7/tcp/udp
```
PORT STATE SERVICE
7/udp open echo
7/tcp open echo
```
## İletişim Echo servisi (UDP)
```bash
nc -uvn <IP> 7
Hello echo #This is wat you send
Hello echo #This is the response
```
## Shodan
* `port:7 echo`
## Referanslar
[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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