that will only redirect port 80. what about other port? how to use multi port command with iptables? does that command alone close all ports?
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IPTABLES for SQUID ONLY Proxy
Hi,
I'm using RHEL3 and wish to convert it into SQUID PROXY box. On top of that, the box will also be a gateway for all clients to access the POP3 (110) and SMTP (25) directly from the net. It will also serves as DHCP server.
I have 2 NIC, eth0 (LAN) and eth1 (Internet) with eth1 having a static internet IP and eth0 having a normal 192.168.0.1.
Now, I don't have any problem with SQUID and the transparent proxy (forwarding 80 to 8080), the problem is i need to forward all internet trafic that can handle by the squid's safe port (default setting) to SQUID. That means, not only port 80, but as well as FTP, https, and others (except for DHCP service, port 110 and port 25).
Nobody from the internet can connect to any services running on the SQUID except Webmin and SSH. Clients will be forced to use SQUID regarding what ports they are connecting to (not only port 80). LO can access anything in and out.
Can you please help me to construct a good IPTABLES based on this requirement?
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Answers
> that will only redirect port 80 ..
is there a problem to copy the command and substitute 80 by 110?
> how to use multi port command with iptables?
depends on your version of iptables
I'd use on rule for each port, simple, legacy compatible, easy to understand ...
> does that command alone close all ports?
no
are your asking for a rule set to perfectly close your network?
A simple rule set to "close all ports" is:
iptables -P OUTPUT DROP
iptables -P INPUT DROP
iptables -P FORWARD DROP
but then you probably need some more rule to get your network working again.
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by: ahoffmannPosted on 2006-03-10 at 00:42:44ID: 16152833
something like (assuming squid on port 3128):
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128