Route all traffic to Loopback with iptables

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http://www.linuxquestions.org – Hello ALL.......! I am trying to redirect the traffic on the tun0 interface to loopback and I request you to guide me. I have a tun0 interface and a when a client with an IP of (coming from tun0) wants to access the Internet I do $ iptables -A POSTROUTING -s -t nat -o wlan0 -j MASQUERADE and the client successfully connects to the Internet over WIFI. Now instead of wlan0 I want to redirect all traffic coming from tun0 to Loopback on which I am running a BIND DNS server and also a lighttpd Webserver. I tried with few rules but failed to do so. Can you guide me (HowTos)