如:
pc1 IP: 192.168.1.2 255.255.255.0
路由器1 Port A IP: 192.168.1.1 255.255.255.0
路由器1 Port B IP: 172.26.1.1 255.255.255.0
路由器2 Port A IP: 172.26.1.2 255.255.255.0
路由器2 Port B IP: 192.168.2.1 255.255.255.0
PC2 IP: 192.168.2.2 255.255.255.0
连接顺序:PC1->路由器1PORT A->路由器1PORT B -> 路由器2PORT A -> 路由器2PORT B-> PC2