nft

Allows configuration of tables, chains and rules provided by the Linux kernel firewall. Nftables replaces iptables. More information: https://wiki.nftables.org/wiki-nftables/index.php/Main_Page.

• View current configuration:
  sudo nft list ruleset
• Add a new table with family "inet" and table "filter":
  sudo nft add table {{inet}} {{filter}}
• Add a new chain to accept all inbound traffic:
  sudo nft add chain {{inet}} {{filter}} {{input}} \{ type {{filter}} hook {{input}} priority {{0}} \; policy {{accept}} \}
• Add a new rule to accept several TCP ports:
  sudo nft add rule {{inet}} {{filter}} {{input}} {{tcp}} {{dport \{ telnet, ssh, http, https \} accept}}
• Add a NAT rule to translate all traffic from the 192.168.0.0/24 subnet to the host's public IP:
  sudo nft add rule {{nat}} {{postrouting}} ip saddr {{192.168.0.0/24}} {{masquerade}}
• Show rule handles:
  sudo nft --handle --numeric list chain {{family}} {{table}} {{chain}}
• Delete a rule:
  sudo nft delete rule {{inet}} {{filter}} {{input}} handle {{3}}
• Save current configuration:
  sudo nft list ruleset > {{/etc/nftables.conf}}