301 200 redirect

301 200 redirect.There is an IP address on each router interface within this small network, including each serial interface. The IP addresses on all serial interfaces (10.1.3.1 and 10.1.3.2, respectively) are located within the same subnet. When PC1 sends an IP packet to address 10.1.2.2, R1 encapsulates the packet on that link using the data link layer protocol, which is shown as the default High-Level Data Link Control (HDLC) encapsulation.Other than that, all parts of this small business network are within the secure space. There is no need for this network to encrypt data with VPN.148 Chapter 7 Virtual Private NetworksGRE creates a concept that acts like the serial link in Figure 7-5 and is very similar to it, at least in terms of IP routing. Rather than replacing the serial link with a serial interface, the router uses a virtual interface called a "tunnel interface." Both routers have IP addresses on the tunnel interface on the same subnet. Figure 7-6 shows an example of a serial link being replaced by one of these virtual tunnel interfaces.Day source data package. ------------------------*A......... Destination address = 10.1.2.2Figure 7-6 Replacing a Serial Link with an IP TunnelNow remembering the overall concept of IP routing, the tunnel looks as if it is another link in the security part of the network. The tunnel address comes from a secure corporate network. The router encapsulates the source packet in the tunnel header instead of the serial link HDLC header. The router even lists the tunnel interface (in this case, Tunnel 0 and Tunnel 1) as the route for the output port.To use a GRE tunnel, the router treats it as an endpoint-to-endpoint topology common link. Routers have IPv4 addresses in the same subnet. These routers using routing protocols become neighbors and exchange routes through the tunnel. Routes obtained through the tunnel show the tunnel interface as the output interface and the IP address of the tunnel interface of the adjacent router as the next-hop router. As shown in Figure 7-7, their routes are shown at the bottom