[Openswan Users] How to estabish more than one tunnel on different interfaces with PF_KEY?

[foren titze]

Hello

I would like to make two or more tunnel on my router with kernel 2.6 and 
openswan 2.2.0. Now the situation is, that the first tunnel is beeing on 
eth0.
for iptables filter/masquerade reason the second tunnel should be bind on 
eth3. 
So how I can told ipsec, that it have to bind on eth3? 
eth0=ipsec0 and eth3=ipsec1 don't work.

Is it possible? 

thx ben