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Configure IPTABLES to route all port 443 and 21 traffic through Squid

jhughesco
jhughesco asked
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Last Modified: 2013-12-16
I have a Linux firewall/router.  IPTABLES is configured so all port 80 traffic routes through squid using the following rule:

$IPT -t nat -A PREROUTING -i $INTDEV -p tcp --dport 80 -j REDIRECT --to-port 8080

However, when I use similar rules to route port 443 and port 21 traffic to squid it does not work.

What squid config would I need to make this work?

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Top Expert 2005
Commented:
> However, when I use similar rules to route port 443 and port 21 traffic to squid it does not work.
> What squid config would I need to make this work?
Simply because https(443) and ftp(21) traffic can't be proxied in transparent mode by squid, refer
http://wiki.squid-cache.org/SquidFaq/InterceptionProxy#head-182f30adede2d8daf8569aef5027629ed799b0d4

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Commented:
Excellent information.  I didn't even realize I was doing a transparent proxy.  I thought I was just doing a nice little trick with IPTABLES.  

Thanks.  
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