linux:debug_connections
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linux:debug_connections [2022/09/26 13:27] manu created |
linux:debug_connections [2023/02/25 18:18] (current) manu |
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| ====== Test connection IP on specific port ====== | ====== Test connection IP on specific port ====== | ||
| + | |||
| + | Find all IPs available in a range: | ||
| + | <cli prompt='#'> | ||
| + | [root@lnx01 ~]# nmap -sn 192.168.0.0/24 | ||
| + | </cli> | ||
| + | |||
| + | Scan on specific ports: | ||
| + | # nmap -sV -p 22,443 192.168.0.0/24 | ||
| + | |||
| + | Which port is open | ||
| + | <cli prompt='#'> | ||
| + | manu-opensuse:/ # nmap -sT -p- 192.168.x.xxx | ||
| + | Starting Nmap 7.92 ( https://nmap.org ) at 2023-02-25 18:16 CET | ||
| + | Nmap scan report for 192.168.x.xxx | ||
| + | Host is up (0.0018s latency). | ||
| + | Not shown: 65520 closed tcp ports (conn-refused) | ||
| + | PORT STATE SERVICE | ||
| + | 53/tcp open domain | ||
| + | 80/tcp open http | ||
| + | 443/tcp open https | ||
| + | ... | ||
| + | MAC Address: 2x:xx:xx (aaaaa SAS) | ||
| + | |||
| + | Nmap done: 1 IP address (1 host up) scanned in 8.34 seconds | ||
| + | </cli> | ||
| <cli prompt='#'> | <cli prompt='#'> | ||
| Line 8: | Line 33: | ||
| </cli> | </cli> | ||
| + | Test a port which is listening | ||
| <cli prompt='#'> | <cli prompt='#'> | ||
| [root@lnx01 ~]# nc -v lnx02 80 | [root@lnx01 ~]# nc -v lnx02 80 | ||
| Line 21: | Line 47: | ||
| </cli> | </cli> | ||
| + | Test a port which is not open | ||
| + | <cli prompt='#'> | ||
| + | [root@lnx01 ~]# nc -v lnx02 3333 | ||
| + | Ncat: Version 7.50 ( https://nmap.org/ncat ) | ||
| + | Ncat: No route to host. | ||
| + | </cli> | ||
| + | |||
| + | Test a port which is listening | ||
| <cli prompt='#'> | <cli prompt='#'> | ||
| [root@lnx01 ~]# telnet lnx02 80 | [root@lnx01 ~]# telnet lnx02 80 | ||
| Line 26: | Line 60: | ||
| Connected to lnx02. | Connected to lnx02. | ||
| Escape character is '^]'. | Escape character is '^]'. | ||
| + | </cli> | ||
| + | |||
| + | Test a port which is not open | ||
| + | <cli prompt='#'> | ||
| + | [root@lnx01 ~]# telnet lnx02 888 | ||
| + | Trying... | ||
| </cli> | </cli> | ||
| Line 60: | Line 100: | ||
| </cli> | </cli> | ||
| + | If you only want to know if the port is open, simply use: | ||
| + | <cli prompt='#'> | ||
| + | # nc -vz www.microsoft.com 80 | ||
| + | </cli> | ||
| + | |||
| + | You can also use netcat to verify if UDP ports are open: | ||
| + | <cli prompt='#'> | ||
| + | # nc -vz -u 8.8.8.8 53 | ||
| + | </cli> | ||
| + | |||
| + | And netcat can be used as a port scanner: | ||
| + | <cli prompt='#'> | ||
| + | # nc -vz <hostname or ip address> 1-1000 | ||
| + | </cli> | ||
linux/debug_connections.1664191640.txt.gz ยท Last modified: 2022/09/26 13:27 by manu
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