From f859c5d8e55356f3c1cb3f99b4a431045dd3927a Mon Sep 17 00:00:00 2001
From: Fascinated <admin@fascinated.cc>
Date: Tue, 27 Jun 2023 09:05:58 +0100
Subject: [PATCH] add networking and ufw to linux basics

---
 guides/linux-basics.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/guides/linux-basics.md b/guides/linux-basics.md
index 4f72943..75d1190 100644
--- a/guides/linux-basics.md
+++ b/guides/linux-basics.md
@@ -57,3 +57,24 @@ This guide provides a brief introduction to Linux, including basic commands and
 - Extract a tar archive: `tar -xvf <archive.tar>`
 - Create a zip archive: `zip <archive.zip> <file>`
 - Extract a zip archive: `unzip <archive.zip>`
+
+## Networking
+
+- Get all interface ips: `ip a`
+- Ping a host: `ping <host>`
+- Get the public IP: `curl ifconfig.me`
+- Get the public IP (alternative): `curl ipinfo.io/ip`
+
+## Firewall (UFW)
+
+Make sure to allow SSH before enabling the firewall, otherwise you will be locked out of your server. `sudo ufw allow ssh`
+
+- Enable the firewall: `sudo ufw enable`
+- Disable the firewall: `sudo ufw disable`
+- List all rules: `sudo ufw status`
+- List all rules (showing numbers): `sudo ufw status numbered`
+- Delete a rule: `sudo ufw delete <rule>`
+- Allow a port: `sudo ufw allow <port>`
+- Deny a port: `sudo ufw deny <port>`
+- Allow a service: `sudo ufw allow <service>`
+- Deny a service: `sudo ufw deny <service>`