table inet filter { chain forward { type filter hook forward priority filter policy drop iifname eno1 oifname dsl counter accept iifname dsl oifname eno1 ct state {established, related} counter accept meta l4proto ipv6-icmp counter accept meta l4proto icmp counter accept meta l4proto igmp counter accept log prefix "drop forward: " counter } chain input { type filter hook input priority filter policy drop iifname lo counter accept iif != lo ip daddr 127.0.0.1/8 counter drop iif != lo ip6 daddr ::1/128 counter drop ct state {established, related} counter accept tcp dport 22 counter accept udp dport 51820 counter accept udp dport 60000-61000 counter accept meta l4proto ipv6-icmp counter accept meta l4proto icmp counter accept meta l4proto igmp counter accept log prefix "drop input: " counter } chain output { type filter hook output priority filter policy accept counter } } table ip nat { chain postrouting { type nat hook postrouting priority srcnat policy accept oifname dsl counter masquerade counter } } table inet mangle { chain postrouting { type filter hook postrouting priority mangle policy accept oifname dsl meta l4proto tcp tcp flags & (syn|rst) == syn counter tcp option maxseg size set rt mtu counter } }