how the iptables affect?

[IaMaPlAyEr]

Hi,

recently, I study the iptables, and was confused by the position of tun in
coova-chilli.

just like this big picture:

http://iptables-tutorial.frozentux.net/images/tables_traverse.jpg

the normal process of the route is just like this:

wire --->>> eth1 --->>> mangle prerouting -->> nat prerouting --->> route
decision --->>....------->>>nat prerouting -->>> eth0

but in coova-chilli, there is a net device TUN, it connect the eth1 to eth0?
where is it in such a normal firewall process?

or just listen the eth1, and copy the date from eth1?
after authz, it use iptables affect the origion firewall process?


thanks for reply!

--
Sincerly,

HaveF
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