IPTables transparent configuration

[intrigeri]

Hi,

Curt Shaffer wrote (17 Nov 2010 12:53:27 GMT) :
> sudo iptables -t nat -A PREROUTING -p tcp -s 172.16.10.0/24 -j DNAT --to-destination
> 10.0.0.23:9040
> sudo iptables -t nat -A PREROUTING -p icmp -s 172.16.10.0/24 -j DNAT --to-destination
> 10.0.0.23:9040
> sudo iptables -t nat -A PREROUTING -p udp -s 172.16.10.0/24 -j DNAT --to-destination
> 10.0.0.23:53

Tor is able to transport TCP only.
If you really want these LAN boxes to *only* access the Internet over
Tor, you have to forbid them anything other than TCP.

If I am not mistaken, the rules you are showing us allow any UDP
traffic to go out (without Tor) unless its destination port is !=53.
I'm not sure this is really what you want to achieve.

Feel free to have a look to the firewall we use in T(A)ILS as a source
of inspiration:

    http://git.immerda.ch/?p=amnesia.git;a=blob;f=config/chroot_local-includes/etc/firewall.conf
    http://git.immerda.ch/?p=amnesia.git;a=blob;f=config/chroot_local-includes/etc/firewall6.conf

Bye,
--
  intrigeri <intrigeri at boum.org>
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