The NAT router translates the inside global address of the packet to the inside local address and then checks the routing table before it sends it to the destination computer.
If the destination address is not in the routing table, the packet is dropped.
如果其目的地址不在这个路由表里，路由器就将数据包丢弃。
3
When a computer on the stub domain that has an inside local address wants to communicate outside the network, the packet goes to one of the NAT routers by way of normal routing to the default-gateway.