allow ip through ufw
sudo ufw allow from 15.15.15.0/24 to any port 22
allow ip through ufw
sudo ufw allow from 15.15.15.0/24 to any port 22
ufw deny from ip
# Totally block
ufw deny from 123.456.543 to any
# Block from specific ports
ufw deny from 123.456.543 to any port your_port
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