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nftables & iptables =================== nftables is the replacement of iptables by the Netfilter project. You are encouraged to migrate now to nftables. If you are developing a new firewall or network service, then writting a nftables ruleset from the beginnig should be fine. If you would like to migrate or translate your previous iptables/ip6tables/arptables/ebtables rulesets to nftables then keep reading. There are some tools in place to help you moving from iptables to nftables, following 2 basic approaches: * command line translation (iptables-translate, iptables-restore-translate, ip6tables-translate, ip6tables-restore-translate) * syntax reuse with nf_tables backend (iptables-nft, iptables-nft-restore, iptables-nft-save, ip6tables-nft, ip6tables-nft-restore, ip6tables-nft-save, arptables-nft, arptables-nft-save, arptables-nft-restore, ebtables-nft, ebtables-nft-save, ebtables-nft-restore) Documentation on how to use these tools can be found at: * https://wiki.debian.org/Moving_from_iptables_to_nftables * https://wiki.nftables.org/wiki-nftables/index.php/Moving_from_iptables_to_nftables * xtables-nft(8) manpage * xtables-translate(8) manpage alternatives ============ The legacy binaries are now installed as: * /usr/sbin/iptables-legacy * /usr/sbin/iptables-legacy-restore * /usr/sbin/iptables-legacy-save * /usr/sbin/ip6tables-legacy * /usr/sbin/ip6tables-legacy-restore * /usr/sbin/ip6tables-legacy-save * /usr/sbin/arptables-legacy (in the arptables Debian package) * /usr/sbin/ebtables-legacy (in the ebtables Debian package) The nft-based tools (tools which accepts the legacy syntax but use the nf_tables kernel subsystem) are installed as: * /usr/sbin/iptables-nft * /usr/sbin/iptables-nft-restore * /usr/sbin/iptables-nft-save * /usr/sbin/ip6tables-nft * /usr/sbin/ip6tables-nft-restore * /usr/sbin/ip6tables-nft-save * /usr/sbin/arptables-nft * /usr/sbin/arptables-nft-restore * /usr/sbin/arptables-nft-save * /usr/sbin/ebtables-nft * /usr/sbin/ebtables-nft-restore * /usr/sbin/ebtables-nft-save The iptables Debian package install both and gives the nft version more priority by default in the update-alternatives system. This means that if you install this package, you will be using the nft tools instead of the legacy ones. Remember, you can change this at runtime using the `update-alternatives` command. NOTE: make sure you don't mix iptables-legacy and iptables-nft rulesets in the same machine at the same time just for sanity and to avoid unexpected behaviours in your network.