# Loopback-interface (local access, eg, to local nameserver):
${FW} -I -a acc -S localhost/32 -D localhost/32

# Local Ethernet-interface:

# Redirect to Squid proxy server:
${FW} -I -a acc -P tcp -D default/0 80 -r 8080

# Accept packets from local network:
${FW} -I -a acc -P all -S localnet/8 -D default/0 -W eth0

# Only required for other types of traffic (FTP, Telnet):

# Forward localnet with masquerading (udp and tcp, no icmp!):
${FW} -F -a m -P tcp -S localnet/8 -D default/0
${FW} -F -a m -P udp -S localnet/8 -D default/0

Here all traffic from the local LAN with any destination gets redirected to the
local port 8080. Rules can be viewed like this:

IP firewall input rules, default policy: reject
type prot source destination ports
acc all 127.0.0.1 127.0.0.1 n/a
acc/r tcp 10.0.0.0/8 0.0.0.0/0 * -> 80 => 8080
acc all 10.0.0.0/8 0.0.0.0/0 n/a
acc tcp 0.0.0.0/0 0.0.0.0/0 * -> *