Introduction
1: Introduction to SSL VPN
2: SSL VPN: The Business Case
3: How SSL VPNs Work
Free Chapter
4: SSL VPN Security
5: Planning for an SSL VPN
6: Educating the User
7: Legacy Data Access
8: The Future of SSL VPN Technology
Appendix A: A Review of TCP, IP and Ports
Appendix B: SSL VPN Gateways
Index
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Chapter 3:
How SSL VPNs
Work [PDF]
How SSL VPNs Work [HTML]
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Chapter 7: Legacy Data Access

A computer, according to Webster's dictionary, is a
machine or person that may be designed to carry out complex and lengthy
mathematical analytical operations very rapidly, to control industrial
operations, or to undertake clerical work. According to this definition,
everyone who works for a government is, in essence, himself/herself a
computer. So are the clerks who check you out at your local grocery
store!
Keeping this in mind, it is
easy to see that the true genealogical history of computing can be
traced back to the formation of math as a tool in humankind's daily
life. The first milestone of computing history might be regarded as the
invention of the Abacus. Having
emerged about 5,000 years ago in China, the abacus is still in use
today.
Having a simple but reliable
system of performing basic mathematical operations, this device was used
for daily commerce by thousands of people throughout the Far East and,
eventually, Asia Minor as well. Users were able to make computations
utilizing a system of sliding beads arranged on a wooden rack, allowing
early merchants to keep a track of trading transactions, in ways they
had never been able to before. From those early roots, humankind was
eventually able to manifest greater power in the computers of today.
This new age of computing
began in the 1950s when John Backus and IBM developed the
FORTRAN computer programming
language. This first modern programming software provided mechanisms and
tools to develop business applications. The next step came with the
development of the ARPANET.
ARPANET, essentially an early and simpler version of the
modern Internet, provided a mechanism for computers to communicate with
each other through a set of interconnecting networks.
At about the same time
computer commerce communication protocols were introduced. One in
particular was Electronic
Data
Interchange
(EDI).
The standard that emerged from this protocol was developed in the 1980s
and was known as ANSI
X12. This brings us to the present
day.
With more than 800 million users, the Web has mutated
into a multitude of tools for business and personal use. The abacus,
though a long way from the Internet, was still both hardware and
software, requiring an end user to operate the system. The Internet is
not dissimilar in that, it comprises hardware, software, and end users.
- Commercial Off-The-Shelf (COTS)
- Custom Programs
- Legacy Applications
- Direct Access
- Scrape the Screen
- Awareness
- SSL VPN with Middleware Access
- Tunneling to the Other Side
- Tunneling Techniques
- Lotus Notes Tunnel
- Other Applications
- Summary
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