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linux_router:nftables [2023-09-19 Tue wk38 19:59] – [Sample NFTables configuration] baumkplinux_router:nftables [2025-03-02 Sun wk09 15:31] (current) – [NFTables Configuration] baumkp
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 {{tag>linux router NFtables firewall}} {{tag>linux router NFtables firewall}}
 =====NFTables Configuration===== =====NFTables Configuration=====
- +The best reference for nftables is at the dedicated wiki [[https://wiki.nftables.org/|wiki nftables]]. Some other references I found [[https://gist.github.com/wolfhechel/db7ed3be31feb104752e|nftables router]]. The reference at stosb is good, but not for a router [[https://stosb.com/blog/explaining-my-configs-nftables/|Explaining My Configs: nftables]]. [[https://blog.programster.org/nftables-cheatsheet|Nftables Cheatsheet]]
-The best reference for nftables is at the dedicated wiki [[https://wiki.nftables.org/|wiki nftables]]. Some other references I found [[https://gist.github.com/wolfhechel/db7ed3be31feb104752e|nftables router]]. The reference at stosb is good, but not for a router [[https://stosb.com/blog/explaining-my-configs-nftables/|Explaining My Configs: nftables]].+
  
 After a lot of experimenting the following is my NFTables router configuration file. Create the following file called: "router.nft". After a lot of experimenting the following is my NFTables router configuration file. Create the following file called: "router.nft".
  
 Dont forget to ensure the router is allowed to forward packets: Dont forget to ensure the router is allowed to forward packets:
-  * ''sudo sysctl net.ipv6.ip_forward'' to check +  * ''sudo sysctl net.ipv4.ip_forward'' to check 
-  * ''sudo sysctl net.ipv6.ip_forward=1'' to set or =0 turn off+  * ''sudo sysctl net.ipv4.ip_forward=1'' to set or =0 turn off
   * ''sudo sysctl net.ipv6.conf.all.forwarding=1'' similar for ipv6    * ''sudo sysctl net.ipv6.conf.all.forwarding=1'' similar for ipv6 
 +Also make permanent in ''/etc/sysctl.conf'', by ensuring ''net.ipv4.ip_forward = 1'' is indicated not commented
 +====iptables====
 +It is not a good idea to have both iptables and nftables rules setup at the same time.
 +  *To check existing iptables rules: ''sudo iptables -S'', the output should be as follows, indicating no restrictions:
 +<code text>-P INPUT ACCEPT
 +-P FORWARD ACCEPT
 +-P OUTPUT ACCEPT</code>
 +  *The iptables rules can be flushed with ''sudo iptables -F''.
 +
 ====Sample NFTables configuration==== ====Sample NFTables configuration====
  
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 ++++mail server ports:| ++++mail server ports:|
-  * smtp {25} / smtps {465} +  * smtp {25} / (smtps) submissions {465} / submission {587} - (My mail server uses smtp / submission on ports 25 / 587 respectivily) 
-  * imap {143} / imaps {993}  (My mail server uses starttls with 143) +  * imap {143} / imaps {993} - (My mail server uses starttls on port 143) 
-  * +  * pop3 {110} / pop3s {995} - who still uses pop3? 
 +''nft'' translates ports to service namesas defined in /etc/services
 ++++ ++++
 ===Some configuration notes=== ===Some configuration notes===
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 Some key related commands: Some key related commands:
-  *To load a nft configuration file: ''sudo nft -f /etc/nftables.conf'' (not used for start configuration) (was router.nft?)+  *To load a nft configuration file: ''sudo nft -f /etc/nftables.conf'' (not used for start configuration) (was router.nft?)  
 +    *Another option is to restart the nftables systemd service, ''sudo systemctl restart nftables.service'' 
 +  *To test the configuration after modification ''sudo nft -c -f /etc/nftables.conf'', it will list errors in the configuration file, no errors will report blank.
   *The nftables configuration file can be made into an executable script as follows.   *The nftables configuration file can be made into an executable script as follows.
      *Add the following at the top of the file:      *Add the following at the top of the file: