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My raspberry pi is connected to a OpenVPN server on interface tun0. The internet connection is setup over a 3G/UMTS mobile stick(eth1).

How can I forward all traffic coming from tun0 to a device with a static ip-adress behind eth0(ethernet port) with iptables?

I added this rule to allow forwarding:

iptables -A FORWARD -i tun0 -o eth0 -j ACCEPT

But how can I route all traffic on a specific ip behind eth0?

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    Hi, I know it's been a while since you have posted this question, but I am trying to do exactly the same thing as you have described here. I am not really good at all this networking shenanigans. Would you be able to post your /etc/network/interfaces or point me into some tutorials you have used to configure your Pi? I would greatly appreciate this. Thanks :) – Daniel Gruszczyk Mar 21 '17 at 9:20
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You want to use "DNAT" for this. You do DNAT in the PREROUTING nat table.

Probablly something along the lines of

iptables -t nat -A PREROUTING -i tun0 -j DNAT --to-destination <destination ip>

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