+## 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 81.2.113.195 81.187.238.128/28 217.169.12.64/28 172.29.198.0/23
+bcp38 6 ppp0 2001:8b0:c92::/48
+