防火墙

如上图所示是组网图，最上面两个是路由器双主的，防火墙是堆叠的，正常情况下防火墙流量是走rout 1和 rout 3 ，当故障是切到rout 4 和 rout 2

int ret 1

 ip address 172.18.18.26 255.255.255.252 

 ospf network-type p2p 

 member interface Route-Aggregation1 priority 100 

 member interface Route-Aggregation2 priority 50

 nat server protocol tcp global 10.235.165.126 6000 inside 172.172.16.16 23 rule ServerRule_1 

int    ret 2

interface Reth2 ip address 172.18.18.30 255.255.255.252 

 ospf network-type p2p 

 member interface Route-Aggregation3 priority 100

 member interface Route-Aggregation4 priority 50 

nat server protocol tcp global 10.235.165.126 6000 inside 172.172.16.16 23 rule ServerRule_1

接路由器的接口做了nat sever 目的地址转换,在不把内部静态路由引入ospf的前提下，我怎么配置才能让公网能访问我内部资源？