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misc/debian/bullseye/notes/firewall-ufw.md

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Install ufw.

apt install ufw

Allow routed traffic.

ufw default allow routed

Allow DHCP Server

ufw allow bootps
ufw allow 53/udp
ufw allow 5355
ufw allow 53/tcp

Allow SSH from local addresses only.

ufw allow from 192.168.1.0/24 proto tcp to any port 22
ufw allow from 192.168.156.0/24 proto tcp to any port 22
ufw allow from 192.168.1.0/24 proto tcp to any port 80
ufw allow from 192.168.156.0/24 proto tcp to any port 80
ufw allow from 192.168.1.0/24 proto tcp to any port 8080
ufw allow from 192.168.156.0/24 proto tcp to any port 8080
ufw allow from 192.168.1.0/24 proto tcp to any port 443
ufw allow from 192.168.156.0/24 proto tcp to any port 443
ufw allow from 192.168.1.0/24 proto udp to any port 5060
ufw allow from 192.168.156.0/24 proto udp to any port 5060
ufw allow from 217.10.64.0/20 proto udp to any port 5060
ufw allow from 217.116.112.0/20 proto udp to any port 5060
ufw allow from 212.9.32.0/19 proto udp to any port 5060
ufw allow from 10.0.0.0/24 proto udp to any port 5060

ufw allow from 192.168.1.0/24 proto udp to any port 24000:26000
ufw allow from 192.168.156.0/24 proto udp to any port 24000:26000
ufw allow from 10.0.0.0/24 proto udp to any port 24000:26000
ufw allow in on wwan0 proto udp to any port 24000:26000

Enable ufw.

ufw enable