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| =Install=
| | [[Kategorie:Nftables]] |
| *apt-get install nftables | | * [[Nftabels Grundlagen]] |
| =Create a basic IPv4 table=
| | * [[Grundlegendes zum Connection Tracking]] |
| *nft add table inet filter | | * [[nftables console]] |
| =List that table=
| | * [[iptables zu nftables]] |
| *nft list table inet filter | | * [[nftables Masquerade]] |
| table inet filter {
| | * [[nftables Host absichern]] |
| }
| | * [[nftables Netze absichern]] |
| =Create a chain for input,output,forward traffic IPv4=
| | * [[nftables misc]] |
| *nft add chain inet filter input { type filter hook input priority 0\; } | | * [[nftables Erweiterungen]] |
| *nft add chain inet filter output { type filter hook output priority 0\; } | | * [[nftables ipsec]] |
| *nft add chain inet filter forward { type filter hook forward priority 0\; } | | * [[nftables Anpassung]] |
| =Conntracking for input,output, forward=
| | * [[nftables Netmap]] |
| *nft add rule filter input ct state established,related counter accept | | * [[nftables Webserver Beispiel]] |
| *nft add rule filter output ct state established,related counter accept | | * [[nftables Webserver Beispiel Ratelimit]] |
| *nft add rule filter forward ct state established,related counter accept | | * [[nft monitor trace]] |
| | |
| =A rule to check that all is fine (IPv4)=
| |
| *nft add rule inet filter input counter accept | |
| =List that table=
| |
| *nft list table inet filter | |
| <pre>
| |
| table inet filter {
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| chain input {
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| type filter hook input priority 0; policy accept;
| |
| counter packets 47 bytes 3100 accept
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| }
| |
| }
| |
| </pre>
| |
| =Flush rules in chain filter/input=
| |
| *nft flush chain inet filter input | |
| =Delete the chain filter/input=
| |
| *nft delete chain inet filter input | |
| =Delete the table filter=
| |
| *nft delete table inet filter | |
| | |
| =Example Script=
| |
| <pre>
| |
| #!/usr/sbin/nft -f
| |
| #variable declration
| |
| define tcp_lan_input_ports = { 8472, 53 }
| |
| define tcp_all_input_ports = { 80, 443 }
| |
| define udp_lan_input_ports = { 53 }
| |
| define tcp_for_input_ports = { 53 }
| |
| define udp_for_input_ports = { 53 }
| |
| | |
| # table declaration
| |
| #
| |
| add table filter
| |
| add table nat
| |
| flush table filter
| |
| flush table nat
| |
| | |
| table filter {
| |
| chain input {
| |
| type filter hook input priority 0; policy drop;
| |
| ct state established,related counter packets 97 bytes 6640 accept
| |
| iifname "lo" counter accept
| |
| iifname "ens19" tcp dport $tcp_lan_input_ports counter accept
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| tcp dport $tcp_all_input_ports counter accept
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| udp dport $udp_lan_input_ports counter accept
| |
| log prefix "nft-input "
| |
| }
| |
| | |
| chain output {
| |
| type filter hook output priority 0; policy drop;
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| ct state established,related counter accept
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| counter accept
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| log prefix "nft-output "
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| }
| |
| | |
| chain forward {
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| type filter hook forward priority 0; policy drop;
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| ct state established,related counter accept
| |
| iifname "ens19" oifname "ens19" counter accept
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| iifname "ens19" oifname "ens18" tcp dport $tcp_for_input_ports counter accept
| |
| iifname "ens19" oifname "ens18" udp dport $udp_for_input_ports counter accept
| |
| iifname "ens19" oifname "ens18" icmp type echo-request counter accept
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| log prefix "nft-forward "
| |
| }
| |
| }
| |
| | |
| table ip nat {
| |
| chain prerouting {
| |
| type nat hook prerouting priority 0;
| |
| }
| |
| chain postrouting {
| |
| type nat hook postrouting priority 0;
| |
| ip saddr 10.83.33.0/24 oif ens18 snat 10.84.252.33
| |
| | |
| }
| |
| }
| |
| 1,1 Top
| |
| </pre>
| |