transparent proxy setup

I installed squid proxy on my local machine running at port # 3128.

To make is transparent proxy, I executed following command.

iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3128

But somehow it is not working. I executed following command and found that none of the packet is meeting this rule...

iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3128

root@test-desktop:/home/test# iptables -nv -t nat -L PREROUTING
Chain PREROUTING (policy ACCEPT 81 packets, 13075 bytes)
pkts bytes target prot opt in out source destination
0 0 REDIRECT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 3128
root@test-desktop:/home/test#


Any idea ?

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