(i'm new to linux)

I have followed 2 similar how-to's on making a transparent proxy using squid. Currently squid is working fine, but it's not transparent yet.

I get my internet from a pppoe dailup, to be shared/proxied to 2 pc's on local network.

According to the how-to's, the last step is to do this:

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128

The settings is right, as far as I can see. The network device is eth0, and squid is running on 3128.

I have checked the iptable with "iptables -t nat -L", and it looks like the how-to wants it.

But nothing happens when I try to surf on a client computer. (have set the client pc's gateway to the squid pc, and selected 'direct internet' inside firefox).

I think the problem may be with iptables. I am having trouble making it log what it's doing. As I understand it, I should add this:

iptables -A INPUT -p tcp --sport 80 -j LOG

and then, the log should appear in /var/log/messages?

REDIRECT will pass traffic to the port specified on eth0 so squid needs to be listening on eth0:3128..

Do netstat -tlnp to see where it's listening.

Your LOG rule needs to be iptables -I INPUT -i eth0 -p tcp --dport 3128 -j LOG
coz the routing has changed the port number..