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hen we talk about connectivity to systems beyond our local network, we start getting into the world of Routing and Remote Access Services (RRAS) The Routing portion of RRAS provides LAN-to-LAN, LAN-WAN, virtual private networks (VPNs), and Network Address Translation (NAT) routing services The Remote Access portion provides remote connectivity to your LAN through dial-up or VPN access With the proliferation of broadband, VPN is gaining greater popularity and can provide faster and more efficient remote connectivity at a lower cost than dial-up services that typically require specialized hardware such as modem banks to become useful RRAS has existed since Windows NT 40, but has steadily evolved into RRAS, now an important part of Windows Server 2008 The implementation of RRAS that is included with Windows Server 2008 includes the ability to integrate seamlessly with Network Access Protection (NAP) to give administrators more granular control over the types of systems allowed to connect to a network remotely Although many organizations use specialized hardware routers to provide routing services, RRAS also gives you the option of using a Windows server as a full-fledged router
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Windows Server 2008 RRAS provides multiprotocol routing services for LAN-LAN, LAN-WAN, VPN, and NAT connections To use the routing feature of RRAS, you need a solid understanding of network protocols The ultimate goal, of course, is to have hosts on one network segment communicate with hosts on another segment that is, internetwork communications Although Windows Server 2008 does provide routing services through RRAS, they really don t compare to the power of dedicated router equipment You may be wondering why this feature should even exist in the operating system, when practically any organization that uses routers would usually choose a dedicated router over a multihomed Windows server In some special circumstances, using Windows Server 2008 and RRAS may actually be your best option After all, it costs nothing but an extra network interface It s a good option if you want to connect a small satellite office to your main office with minimal cost and you expect only a light load to be placed on the server as a result of its routing function In reality, though, routing is probably the least used of the two primary features that RRAS can provide
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Before going any further, you should understand how routing works Although RRAS provides multiprotocol routing capabilities, this discussion will focus on TCP/IP since that is by far the most commonly used protocol on a Windows network Packets used in TCP/IP communication have source and destination addresses A subnet mask is applied to each address to determine which part of the IP address is the network address and which part refers to the host When a packet is being sent to its destination by a host, it first determines whether the destination address is on the same subnet
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If it is on the same subnet, the packet is simply sent out over the physical medium for the destination host to pick up If it determines that the destination is part of a different network, it sends this packet to a router either defined by its routing table or, if no match is found, to its default gateway It is the router s responsibility to examine packets being sent out to a different network to determine where they should be sent off to next The router intelligently determines to which of its known interfaces it will send the packet to reach its final destination This is dictated by routing tables in the router that define rules that govern how packets should be delivered, based on destination addresses Some routers are configured with redundant links to the same destination For example, the router might be connected to another network via a T1 line going to one Internet Service Provider (ISP) and another T1 going to a completely different ISP The purpose for such a configuration is that if one connection fails, it has an alternative route it can take Cost metrics are then associated with each of these lines so that the router can make intelligent decisions around which path to use for traffic You can configure load balancing for traffic across both lines or configure one line as the primary that can switch over to the other line if the primary is unavailable Figure 11-1 shows two networks separated by two routers that are directly connected The best way to understand this concept is to illustrate the process of how the packets get from one host to another Use Figure 11-1 to follow along If Client A with the IP address 1921681010/24 wants to send a packet to Client B with IP address 1921681015/24, it first determines that they are both on the same network namely 192168100 In this case, Client A puts the packet on the wire for Client B to pick up Now change that scenario a bit, and say that Client A needs to send a packet to Server A
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Client A 192168151/24 1921681001/24
Router A 192168101/24
Router B 192168155/24
Server A 19216810010/24
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