Redirect Mikrotik ke SquidBox

Translasi dari command ip-tables pada linux ke mikrotik (sumber command syntax linux dari : http://tldp.org/HOWTO/TransparentProxy-6.html)

Method pertama :

• iptables -t nat -A PREROUTING -i eth0 -s ! squid-box -p tcp –dport 80 -j DNAT –to squid-box:3128
• iptables -t nat -A POSTROUTING -o eth0 -s local-network -d squid-box -j SNAT –to iptables-box
• iptables -A FORWARD -s local-network -d squid-box -i eth0 -o eth0 -p tcp –dport 3128 -j ACCEPT

Spesifikasi :

• Squid Box : 192.168.1.1, Mikrotik: 192.168.1.254
• Mikrotik versi 2.9.27
• LAN : ether1, Internet : ether2

Translasi ke mikrotik method pertama :

• Pada table NAT :
  • tambahkan dst-nat, src-address = !192.168.1.1 protocol=tcp dst-port=80 in-interface=ether1 action=dstnat to-addresses=192.168.1.1 to-port=3128
  • tambahkan src-nat, src-address=192.168.1.0/24 out-interface=ether1 action=srcnat to-addresses=192.168.1.254 to-port=0-65535
  • tambahkan filter rules chain=forward src-address=192.168.1.0/24 dst-address=192.168.1.1 dst-port=3128 in-interface=ether1 out-interface=ether2 action=accept

Method kedua :

• iptables -t mangle -A PREROUTING -j ACCEPT -p tcp –dport 80 -s squid-box
• iptables -t mangle -A PREROUTING -j MARK –set-mark 3 -p tcp –dport 80
• ip rule add fwmark 3 table 2
• ip route add default via squid-box dev eth1 table 2
• Next, squid-box. Use this command, which should look remarkably similar to a command we’ve seen previously.
• iptables -A PREROUTING -t nat -i eth0 -p tcp –dport 80 -j REDIRECT –to-port 3128

Translasi ke mikrotik method kedua :

• Pada table mangle, tambahkan chain=prerouting protocol=tcp dst-port=80 action=mark routing new routing mark=mark80
• Pada table filter, tambahkan chain=forward routing mark=mark80 action=accept
• Pada IP-Route, tambahkan destination=0.0.0.0/0 gateway=192.168.1.1 mark=mark80 distance=1 interface=ether1
• Untuk di Squid Box silakan sesuai dengan firewall yang anda gunakan, saya menggunakan shorewall, cukup menambahkan di file /etc/shorewall/ruless -> REDIRECT local 3128 tcp www - !192.168.1.1

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