+## Permitted special forwarding.
+makeset fwd-allow-http nethash || :
+iptables -A fwd-spec-nofrag -j ACCEPT \
+ -m set --match-set fwd-allow-http dst \
+ -p tcp --destination-port $port_http \
+ -m mark --mark $to_untrusted/$MASK_TO
+iptables -A fwd-spec-nofrag -j ACCEPT \
+ -m set --match-set fwd-allow-http src \
+ -p tcp --destination-port $port_http \
+ -m mark --mark $from_untrusted/$MASK_FROM \
+ -m state --state ESTABLISHED
+
+## BCP38 filtering. Note that addresses here are seen before NAT is applied.
+bcp38 4 ppp0 62.49.204.144/28 172.29.198.0/23
+bcp38 6 t6-he \
+ 2001:470:1f08:1b98::2 2001:470:1f09:1b98::/64 \
+ 2001:470:9740::/48
+