4.10.2 Firewalls
Every entry filed under Firewalls and its subtopics.
Level
- Beginner 4
- Intermediate 0
- Advanced 0
What kind of help
- Guided project 0
- Explains an idea 1
- Step by step 1
- Cheat sheet 1
- Fixes an error 1
What do these mean?
- Beginner
- You are new to this topic.
- Intermediate
- You use it, and want to get better.
- Advanced
- You know it well and need the details.
- Guided project
- Build something small from start to finish, step by step.
- Explains an idea
- Plain words on how something works and why.
- Step by step
- Numbered steps to get one task done.
- Cheat sheet
- Commands and options in a table, to look up fast.
- Fixes an error
- An error message, what it means, and how to solve it.
6 entries match these filters
- 0435 CrowdSec: collaborative intrusion prevention that shares blocklists CrowdSec reads your logs, detects attacks such as brute force and scanning, blocks the source, and shares anonymised reports so that every… Linux, Windows Repo Detection & threat hunting · Firewalls 15 Oct 2026
- 0436 Suricata: a network intrusion detection and prevention engine Suricata inspects network traffic in real time, matches it against signature rules and protocol logic, and writes alerts and rich protocol logs.… Linux Repo Detection & threat hunting · Firewalls 15 Oct 2026
- 0344 ufw and firewalld: open and close ports Allow and remove ports and services on the two standard Linux host firewalls, restrict a port to one source network, and make… Beginner · Step by step · Linux Article Firewalls · Networking & firewalls 15 Oct 2026
- 0347 Port check script: test a list of host:port pairs with timeouts A bash script that tries a TCP connection to each host:port you give it, waits a few seconds at most, and reports… Beginner · Cheat sheet · Linux, macOS Script DNS, IP addresses & ports · Firewalls 15 Oct 2026
- 0343 Fix: Connection refused and Connection timed out, what each one means Refused means the host answered and nothing is listening there. Timed out means no answer at all, usually a firewall or wrong… Beginner · Fixes an error · Linux, macOS Article DNS, IP addresses & ports · Firewalls 15 Oct 2026
- 0280 What is a firewall? A firewall is a filter that decides which network connections are allowed in or out of a computer or network. Beginner · Explains an idea · Any system Article Firewalls 15 Oct 2026