Firewalling & Network Security

Caution

This section is under development. Thank you for your patience.

Common Commands

• Ubuntu UFW:

  sudo ufw status verbose
  sudo ufw allow 22/tcp

• RHEL 9 firewalld:

  sudo firewall-cmd --list-all
  sudo firewall-cmd --reload

• nftables (RHEL 9 default backend):

  sudo nft list ruleset
  sudo nft add rule inet filter input tcp dport 443 accept