Hacks #67-81
Untrusted computer networks (such as the Internet and
public wireless networks) can be pretty hostile environments, but
they can be tamed to some degree. By
leveraging encryption and some encapsulation tricks, you can build
more trustworthy networks on top of whatever network you choose, even
if it is full of miscreants trying to watch or otherwise manipulate
your data. This chapter primarily
deals with how to set up secure, encrypted communications over
networks that you don't completely trust. Some of the hacks focus mainly on providing a
secure and encrypted transport mechanism, while others discuss how to
create a virtual private network (VPN).In reading this chapter, you'll learn how to set up
Ipsec-based encrypted links on several operating systems, how to
create virtual network interfaces that can be tunneled through an
encrypted connection, and how to forward TCP connections over an
encrypted channel. In addition,
you'll also learn how to set up a cross-platform VPN
solution.The beauty of most of these hacks is that after reading them, you can
mix and match transport-layer encryption solutions with whatever
virtual network-oriented approach that best meets your
needs. In this way, you can safely
build vast, powerful private networks leveraging the public Internet
as infrastructure. You can use these
techniques for anything from securely connecting two remote offices
to building a completely routed private network enterprise on top of
the Internet. |
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