vb.net generate barcode image PART IV in Visual C#

Draw PDF-417 2d barcode in Visual C# PART IV

PART IV
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Recognizing PDF417 In C#
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Appendixes
Drawing Barcode In Visual C#.NET
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Bar Code Recognizer In Visual C#.NET
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Persistent vs. On-Demand Connection
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If you are contemplating using two-way initiation, you should also consider using a persistent connection. The choices are relatively simple:
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Do I have a permanent connection to the Internet on both sides of the
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link For example, the remote site uses a broadband connection to the Internet instead of a dial-up connection. If the answer is yes, ask the fol lowing question.
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If I do have the permanent connections on both sides, is there any reason I
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would want to tear down the link For example, no one is in the office and I m worried about security breaches; or I have two sites I m servicing, and one is in New York and the other in India. If the answer is no, you should consider using a persistent link between the sites. Using a persistent link reduces overhead in administration, reduces the need for extensive deploy ment and management of complex demand-dial filters, and reduces the log ging and auditing needed to maintain the link. Finally, if you are using dynamic routing, it reduces flapping of the link and has less effect on the dynamic routing protocols.
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Routing Methods: Static vs. Dynamic
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Bar Code Reader In Visual Studio .NET
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On site-to-site links, unless there is a really serious reason not to, use static routes on the gateways instead of dynamic routes. Although at first glance it might seem attractive to use dynamic routing, consider the following issues:
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The network address allocations between the primary and remote sites of a
corporation rarely change, and if they do change it is usually only to add a single subnet to the routing. By definition, this is an ideal place to use static routes because route summarization can be used to cut down on the confu sion and management of the TCP/IP network.
If you are not using a persistent connection, the link will be going up and
down on a semi-regular basis. This will look like a flapping link to the dynamic routing protocol, and it will cause a network convergence to occur in the area of the VPN gateway connection. For anyone who has set up a dynamic routing architecture, this is undesireable behavior. By using static routes, flapping will not occur and the dynamic routing architecture will not be affected by on-demand, site-to-site VPN connections.
Certificates vs. No Certificates
Always use certificates whenever possible on site-to-site links.
Appendix A
VPN Deployment Best Practices |
By using certificates for all VPN communications, you eliminate the possibility of a rogue server capturing a set of username/password credentials and impersonating the remote site. If the default method is to use certificates, this impersonation attack is not possible and the VPN architecture is much more secure. Even if you decide not to use certificates for remote access VPN (and we highly recommend that you do), we still recommend that you use certificates for site-to-site. Site-to-site VPN links are designed to occur without any human intervention, thus making them more attractive to hackers.
Troubleshooting: Do It by the Book!
When it comes to troubleshooting the VPN architecture, use the procedures outlined in the book in the order that they appear. The troubleshooting procedures in this book are designed to rule out issues step by step. They are designed to drill down to the root causes of setup failures and prob lems. VPN is not a technology that responds well to a shotgun method of trouble shooting many services and systems need to work with each other to make a VPN setup operate successfully. Take the time, use our procedures, and make sure to check out the sample logs and troubleshooting samples included on the compan ion CD for this book. Our test team in the Windows Division at Microsoft Corporate uses the same logs and tools to troubleshoot, so you should be successful in trou bleshooting VPN every time.
Summary
Throughout the book, we make recommendations about which protocol or meth odology to use to make your VPN solution the best it can possibly be. In this appendix, we have put all these recommendations in one place for you to read through quickly and easily. This compilation should enable you to more easily plan and make choices and cut down on the confusion. Microsoft offers many options for VPN. One of the greatest strengths of Microsoft s VPN technologies is their flex ibility and interoperability with other third-party technologies. This appendix outlines our recommendations regarding options for creating the most secure and functional VPN solution possible for your environment.
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