VPN & FIREWALL
Model : VPN & FIREWALL
Computer networks are typically a shared reso
urce used by many applications for many
different purposes. Sometimes the data transmitted between application processes is
confidential, and the application users would pr
efer that others not be able to read it.
A firewall is a specially programmed router that sits between a site and the rest of the
network. It is a router in the sense that it
is connected to two or more physical networks
and it forwards packets from one network to another,
but it also filters the packets that flow
through it. A firewall allows the system administrator to implement a security policy in one
centralized place. Filter-based firewalls are
the simplest and most widely deployed type of
firewall. They are configured with a table of addresses that characterize the packets they
will and will not forward.
A VPN is an example of providing a controlled
connectivity over a public network such as
the Internet. VPNs utilize a concept called an
IP tunnel
—a virtual point-to-point link
between a pair of nodes that are actually se
parated by an arbitrary number of networks.
The virtual link is created within the router at t
he entrance to the tunnel by providing it with
the IP address of the router at the far end
of the tunnel. Whenever the router at the
entrance of the tunnel wants to send a packet over this virtual link, it encapsulates the
packet inside an IP datagram. The destination address in the IP header is the address of
the router at the far end of the tunnel, while t
he source address is that
of the encapsulating
router.
In this lab you will set up a network where
servers are accessed ov
er the Internet by
customers who have different
privileges. You will study ho
w firewalls and VPNs can
provide security to the information in the se
rvers while maintaining
access for customers
with the appropriate privilege
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