I've got the topology above and have assigned dynamic NAT to the router illustrated. My question is how would I assign dynamic NAT on the other router? I have tried to add it on and I ping from 188.8.131.52 on the right and it goes across and gets translated and reaches the other PC but when the ping comes back the router on the left changes the source IP from 192.168.0.x to the dynamic NAT I have listed on the router.
-Then when the router on the right get's the ping it has a source on 20.0.0.x so sends it back to that router again.
I have taken my dynamic entries off of the router on the left and now everything works ok.