build/layer/router-rpi3/nftables.rules

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flush ruleset
table inet filter {
chain input {
type filter hook input priority 0; policy drop;
ct state established, related accept
ct state invalid drop
iifname lo accept
iifname wlan0 accept
ip protocol icmp accept
reject
}
chain forward {
type filter hook forward priority 0;
oifname port0 accept
iifname port0 ct state related, established accept
iifname port0 drop
}
chain output {
type filter hook output priority 0; policy accept;
}
}
table ip nat {
chain prerouting {
type nat hook prerouting priority 0;
}
chain postrouting {
type nat hook postrouting priority 0;
oifname port0 masquerade
}
}