hello everyone,

my system with linux mint 17 has two physical network ports. the first port is connected with the router and offers the inet connection. the second port is for my amazon firetv. I want to build a network bridge where I can set a proxy or a vpn server. The background is that I need e.g. US IP for some reasons. I know there are maybe some apps for an rooted firetv, but I don't want touch my firetv box.

I'm glad about your help, thanks a lot!

//addition
Okay I found the option "shared to other computers" in network connections > connection > ipv4 settings > method. Now there is a option called "automatically connect to vpn .." under connection > general. Is the vpn channel only for this network device (for my firetv) or are all connections affected?

Your Mint17 will effectively end up with 3 network adapters. Two of those will be physical (eth0, eth1 or whatever the driver dictates) and one will be a point-to-point adapter. If you are using OpenVPN this will be tun0 or tap0. If you are using IPSec, it will be a ppp0 device.

You effectively want to manipulate the routing tables of your Min17 using "route add". Redirect the IP-Ranges for the TV by specifying that the vpn interface should be used (the vpn server should be the gateway).

To enable forwarding on the box:
echo 1 > /sys/net/ipv4/ip_forwarding
iptables -I FORWARD -i <ethx> -o <vpny> -j ACCEPT
iptables -I FORWARD -o <ethx> -i <vpny> -j ACCEPT

In order for this to work, you will propably need to masquerade outgoing packets to use the IP of the VPN interface. Take a look at the iptables manpage. I think it was something like:

iptables -t nat -A POSTROUTING -o <name of vpn interface> -j MASQUERADE

Take a look at the manual pages of route and iptables; they are both pretty thorough.

Okay, thanks a lot for your help ..I will check this in few weeks.