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It's NATing redirected traffic to the squid server, to make sure it gets routed through the gateway on its way back. However, the NATed packets go to port 3128 of the squid server, not port 80. The line should read:
The ip address of a webserver you referring to something like osnews.com and the answer is "Access Denied" also, but you have to keep in mind that on the squid server there are 2 network cards eth0: 192.168.10.254 and eth1: 192.168.10.253 (which is squid).
Squid is setup to run on 192.168.10.253:3128, but it doesn't matter, I'm still getting the same "Access Denied.".
Yes, I can telnet to 192.168.10.253 on port 3128. Actually I can use the proxy server the 'normal' way.
I'm still not sure what there is need for another ACCEPT rule if that ip address is not used at all and that squid listens only on 192.168.10.253?