#Macros
int_if = "sis0"
ext_if = "rl0"

tcp_services = "{ 22, 80 }"
icmp_types = "echoreq"

priv_nets = "{ 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8 }"

comp3 = "192.168.99.2"

# options
set block-policy return
set loginterface $ext_if
set skip on lo0

# scrub
scrub in all

# nat/rdr
nat on $ext_if from $int_if:network to any -> $ext_if
rdr on $ext_if proto tcp from any to any port 80 -> $comp3 port 80

# filter rules
block all

block drop in  quick on $ext_if from $priv_nets to any
block drop out quick on $ext_if from any to $priv_nets

pass in on $ext_if inet proto tcp from any to ($ext_if) \
   port $tcp_services flags S/SA keep state

pass in on $ext_if proto tcp from any to $comp3 port 80 \
   flags S/SA synproxy state

pass in inet proto icmp all icmp-type $icmp_types keep state

pass in  on $int_if from $int_if:network to any keep state
pass out on $int_if from any to $int_if:network keep state

pass out on $ext_if proto tcp all modulate state flags S/SA
pass out on $ext_if proto { udp, icmp } all keep state