alterei o seguinte esquema...

Nesta parte do script estava assim:
add chain=prerouting in-interface=Saida connection-mark=odd action=mark-routing \
new-routing-mark=odd passthrough=no comment="" disabled=no
add chain=prerouting in-interface=Saida connection-state=new nth=1,1,1 \
action=mark-connection new-connection-mark=even passthrough=yes comment="" \
disabled=no

Entao alterei e deixei assim:
add chain=prerouting in-interface=Saida connection-state=new nth=1,1,1 \
action=mark-connection new-connection-mark=even passthrough=yes comment="" \
disabled=no
add chain=prerouting in-interface=Saida connection-mark=odd action=mark-routing \
new-routing-mark=odd passthrough=no comment="" disabled=no

o resto do script nao alterei nada...

abraços e desculpa pois realmente esqueci de postar a solucao...

t+ galera...