bộ định tuyến mà không thay đổi địa chỉ IP đích, các máy tính sử dụng các phương tiện truyền thông kiểm soát truy cập (MAC) địa chỉ (Layer 2 địa chỉ). Do đó, khi gói tin được chuyển tiếp giữa các mạng, địa chỉ IP nguồn và đích không bao giờ thay đổi. Tuy nhiên, nguồn và địa chỉ MAC đích được viết lại cho tất cả các mạng giữa các máy khách và máy chủ. | Layer 2 and Layer 3 Addresses The destination IP address a Layer 3 address of a packet never changes it is always set to the IP address of the target computer. To forward packets to a router without changing the destination IP address computers use the media access control MAC address a Layer 2 address . Therefore as the packet is forwarded between networks the source and destination IP addresses never change. However the source and destination MAC addresses are rewritten for every network between the client and server. Configuring Static Routing with Routing and Remote Access After installing the Network Policy and Access Services server role you can view the IP routing table by right-clicking Roles Network Policy and AccessServices Routing And Remote Access IPv4 Static Routes and then selecting Show IP Routing Table. Routing And Remote Access displays the static routing table which does not include any dynamic routes added from RIP . You install the Network Policy and Access Services server role and view the IP route table in the practice session later in this lesson. Using Routing Information Protocol Static route table configuration is efficient if your network contains only a few typically five or fewer routers and the network configuration does not frequently change. For larger but not very large networks typically containing up to 15 routers or for networks in which the network topology is liable to change for example a dynamic corporate network used by a small but rapidly expanding organization the use of a routing protocol is indicated. The Microsoft software-based routing solution is not appropriate for large complex networks in which hardware routers or layer 3 switches might be used. Consequently Windows Server 2008 supports Routing Information Protocol RIP which is designed for exchanging routing information within a small to medium-size network. RIP is simple to configure and deploy. However it cannot scale to large or very large networks. The maximum
