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

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# Basiese Inligting

'n Echo-diens is op hierdie gasheer aan die gang. Die echo-diens was bedoel vir toets- en meetdoeleindes en kan op beide TCP en UDP protokolle luister. Die bediener stuur enige data wat dit ontvang terug, sonder enige verandering.\
**Dit is moontlik om 'n ontkenning van diens te veroorsaak deur 'n echo-diens aan die echo-diens op dieselfde of 'n ander masjien te koppel**. Vanweë die buitensporig hoë aantal pakkette wat geproduseer word, kan die geraakte masjiene effektief uit diens geneem word.\
Inligting van [https://www.acunetix.com/vulnerabilities/web/echo-service-running/](https://www.acunetix.com/vulnerabilities/web/echo-service-running/)

**Standaard Poort:** 7/tcp/udp
```
PORT   STATE SERVICE
7/udp  open  echo
7/tcp  open  echo
```
## Kontak Echo diens (UDP)
```bash
nc -uvn <IP> 7
Hello echo    #This is wat you send
Hello echo    #This is the response
```
## Shodan

* `port:7 echo`

## References

[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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