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#!/sbin/nft -f
flush ruleset
table ip filter {
# allow all packets sent by the firewall machine itself
chain output {
type filter hook output priority 100; policy accept;
}
# allow LAN to firewall, disallow WAN to firewall
chain input {
type filter hook input priority 0; policy accept;
iifname "lan0" accept
iifname "wan0" drop
}
# allow packets from LAN to WAN, and WAN to LAN if LAN initiated the connection
chain forward {
type filter hook forward priority 0; policy drop;
iifname "lan0" oifname "wan0" accept
iifname "wan0" oifname "lan0" ct state related,established accept
}
}
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