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#!/usr/sbin/nft -f # This example file shows how to implement load balancing using the nftables # framework. # This script is meant to be loaded with `nft -f <file>` # You require linux kernel >= 4.12 and nft >= 0.7 # For up-to-date information please visit https://wiki.nftables.org flush ruleset table ip nat { chain prerouting { type nat hook prerouting priority -300; # round-robing load balancing between the 2 IPv4 addresses: dnat to numgen inc mod 2 map { 0 : 192.168.10.100, \ 1 : 192.168.20.200 } # emulate flow distribution with different backend weights using intervals: dnat to numgen inc mod 10 map { 0-5 : 192.168.10.100, \ 6-9 : 192.168.20.200 } # tcp port based distribution is also possible: ip protocol tcp dnat to 192.168.1.100 : numgen inc mod 2 map { 0 : 4040 ,\ 1 : 4050 } # consistent hash-based distribution: dnat to jhash ip saddr . tcp dport mod 2 map { 0 : 192.168.20.100, \ 1 : 192.168.30.100 } } } table ip raw { chain prerouting { type filter hook prerouting priority -300; # using stateless NAT, round-robing distribution (you could use hashing too): tcp dport 80 notrack ip daddr set numgen inc mod 2 map { 0 : 192.168.1.100, 1 : 192.168.1.101 } } } table netdev mytable { chain ingress { # mind the NIC devices, they must exist in the system type filter hook ingress device eth0 priority 0; # using Direct Server Return (DSR), connectionless approach: udp dport 53 ether saddr set aa:bb:cc:dd:ff:ee ether daddr set numgen inc mod 2 map { 0 : aa:aa:aa:aa:aa:aa, 1 : bb:bb:bb:bb:bb:bb } fwd to eth1 # using Direct Server Return (DSR), connection-oriented flows: tcp dport 80 ether saddr set aa:bb:cc:dd:ff:ee ether daddr set jhash ip saddr . tcp sport mod 2 map { 0 : aa:aa:aa:aa:aa:aa, 1 : bb:bb:bb:bb:bb:bb } fwd to eth1 } }
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ct_helpers.nft
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