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