vb.net generate barcode image Configuring Routing on the VPN Routers in Visual C#

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Configuring Routing on the VPN Routers
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For your VPN routers to properly forward traffic to locations within the site in which they are located, you must configure them with either static routes that summarize all the possible addresses used on the other site or with routing protocols so that the VPN router can participate as a dynamic router and automatically add routes for site subnets to its routing table.
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Routing Table Maintenance Methods
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You can add routes to routing tables using the following methods:
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Dynamic routing using routing protocols Static routing using manually-configured static routes
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It s up to you to analyze the network and decide which method to use at which time and on which portion of the network. Many would say that for the sake of administrative ease you should settle on one method, but a savvy network designer will identify how to use the methods to their best advantage and make them work together to provide the best network communications. We ll show you where and when to use each method, but first we ll show you the different uses of routing protocols in a Routing And Remote Access environment and explain why you should deploy different solutions for different scenarios.
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Deploying Site-to-Site VPNs |
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Let s take a look at different scenarios and usages of routing protocols in an enterprise VPN solution:
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Failover When you are running client systems or an end-point, site-to-site system that are critical to the company s operations, you want to ensure interoperability and resilience in the case of network failure or hardware failure. This means that when you have more than one VPN router running, you want the two systems to monitor each other one as a primary system and one as a failover system. The failover system must be able to tell when the primary router has failed and adjust the network so that all communications will go through it rather than the primary router. Dynamic routing protocols such as Open Shortest Path First (OSPF) allow you to set up two equal systems and keep one in failover mode while monitoring the primary system for availability. If the primary fails, the secondary can recon verge the network to go through the secondary path. Sometimes the infrastructure of the network layout shows that one VPN entry point is preferable to another, and you ll want to streamline network traffic to run through different options based on the location of the end-user systems and the VPN routers. By deploying dynamic routing, you can always be sure that the end user is getting the most viable traffic link at any given time. If, for example, there are multiple resources to service a request (redundant databases, Web servers, mail servers, etc.) but you want to force traffic down a particular network path for a logistical reason, you can use routing protocols with weighted routes. If you need more information about how to apply a weight to a route, please refer to the appropriate documentation for your router equipment. Route prioritization is a critical function for VPN strategies because users and remote sites will have relatively low bandwidth to network resources as compared to internal nodes that will have full switching speeds available to them. To give the VPN users the same kind of network experience, you might want to work with your routing protocols to give them access to faster or closer solutions on the network.
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Network redundancy
Routing solutions A proper combination of routing methods allows a network to perform at peak efficiency. There isn t one magic method that can do all the work. For instance, you will want routing to stay static on well-known routes that will be advertised to outside entities, but you want to keep your intranet dynamic so that it can make quick changes if necessary. You also want to reduce the amount of administrative overhead needed to handle the routing of the internal resources and make the network changes transparent to the remote access-based user groups. These groups would be heavily affected if they had to be aware of every network change occurring internally. A cross between dynamic and static routing solutions will give the remote users an extrapolation layer to these changes and provide for a better overall experience with the VPN systems. Dynamic routing vs. static routing You need to understand two kinds of routing methods to get the greatest benefit from the VPN solutions and communications standards we are implementing: dynamic routing and static routing.
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