option IPFIREWALL
option IPFIREWALL_FORWARD
options IPFIREWALL_VERBOSE
options IPFIREWALL_VERBOSE_LIMIT=50
options IPFIREWALL_DEFAULT_TO_ACCEPT
options IPDIVERT

device gre

ifconfig gre0 create
ifconfig gre0 proxy_ip 10.20.30.40 netmask 255.255.255.255 link2 tunnel proxy_ip cisco_ip up

ipfw add pass all from any to any via lo0
ipfw add allow tcp from proxy_ip to any
ipfw add fwd 127.0.0.1,3128 log tcp from any to any http via gre0 in

redir_mods transparent;

module transparent {
myport 3128
broken_browsers MSIE
}

module wccp2 {
service-group web-cache
router cisco_ip

}

tcpdump -i gre0