Lagi nyoba cacheboy tapi belum berhasil yang Tproxy karena mesinku amd. Googling nemu artikel berikut. Semoga bermanfaat
Diambil dari : http://hikmah-teknologi.blogspot.com/

LUSCA TPROXY on FREEBSD-7-STABLE
patch kernel:
cd /usr/src
fetch http://squid-proxy-pkg.googlecode.com/files/freebsd-tproxy-sys.patch
path -p0 < freebsd-tproxy-sys.patch

di kernel : /sys/i386/conf/PROXY
options IP_NONLOCALBIND
options IPDIVERT
options IPFIREWALL
options IPFIREWALL_NAT
options IPFIREWALL_VERBOSE
options IPFIREWALL_FORWARD
options IPFIREWALL_DEFAULT_TO_ACCEPT
options IP_NONLOCALBIND
options LIBALIAS

#option tunning for squid
options VFS_AIO
options MAXFILES=262144
options MSGMNB=32768
options MSGMNI=82
options MSGSEG=4096
options MSGSSZ=128
options MSGTQL=2048
options SHMSEG=32
options SHMMNI=256
options SHMMAX=4194304
options SHMALL=16384
makeoptions COPTFLAGS="-O2 -pipe -funroll-loops -ffast-math"
makeoptions NO_MODULES=yes

build kernel
cd /usr/src
make buildkernel KERNCONF=PROXY && make installkernel KERNCONF=PROXY

di /etc/sysctl.conf
net.inet.ip.nonlocalok=1

cp /usr/src/sys/netinet/in.h /usr/include/netinet


install squid
pkg_add -v http://squid-proxy-pkg.googlecode.com/files/lusca-with-tproxy-r14371_3.tbz

di /usr/local/etc/squid/squid.conf

http_port XXX.INTERNAL.IP.XXX:3128 transparent tproxy


# em0 -> External interface (to mikrotik)
# em1 -> Internal interface (to client)

di /etc/ipfw.tproxy
ipfw add fwd 192.168.1.1,3128 tcp from 192.168.1.0/24 to any 80 in via em1 # default rule to transparent proxy
ipfw add fwd 192.168.1.1 tcp from any 80 to 192.168.1.0/24 in via em0 # catch the packets that come back using the clients IPs

di rc.conf
gateway_enable="YES"
ifconfig_em0="192.168.0.1 255.255.255.252"
ifconfig_em1="192.168.1.1 255.255.255.0"
firewall_enable="YES"
firewall_script="/etc/ipfw.tproxy"
firewall_type="open"
firewall_logging="YES"

fsck_y_enable="YES"
background_fsck="NO"

squid_enable="YES"
#disini tidak menggunakan bind taoi dnsmasq

dnsmasq_enable="YES"
dnsmasq_flags="--conf-file=/usr/local/etc/dnsmasq.conf"

dan jangan lupa di router paling atas untuk membuat NAT dan static routes utk ip di bawah proxy