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nmap: List only open ports while scanning
2 min read
While scanning using nmap a network for a specific port (using the -p option), it can be confusing toe get a list of hosts that are alive with either closed or filtered ports while we only care for open ports:
$ sudo nmap -sS 10.12.16.0/24 -p 8123 Starting Nmap 7.80 ( https://nmap.org ) at 2022-12-04 18:18 CET Nmap scan report for _gateway (10.12.16.1) Host is up (0.0010s latency). PORT STATE SERVICE 8123/tcp filtered polipo MAC Address: CD:44:F0:F4:22:44 (Unknown) Nmap scan report for 10.12.16.10 Host is up (0.00020s latency). PORT STATE SERVICE 8123/tcp open polipo MAC Address: DC:A6:33:77:AA:BB (Raspberry Pi Trading) Nmap scan report for 10.12.16.33 Host is up (0.00046s latency). PORT STATE SERVICE 8123/tcp closed polipo MAC Address: B8:27:EB:8D:99:11 (Raspberry Pi Foundation) (...) Nmap done: 256 IP addresses (15 hosts up) scanned in 1.78 seconds05/12/2022
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Using nmap to brute-force SSH
2 min read
If we have a bunch of Raspberries on our network and we want to make sure we are not using the default password on any of them, we can using nmap fo trying to brute-force into them
15/09/2021
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From pet to cattle
Treat your kubernetes clusters like cattle, not pets