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Ingeniera en Sistemas
Computacionales
Seguridad en Redes
VPN (Virtual Private Network)
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What is VPN ? A VPN is a private network that uses a public
network
(usually the internet) to connect remote sites or users
together.
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Characteristics of VPN
Encrypted Traffic
Remote site is authenticated
Support multiple protocols
Point to Point Connection
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Types of VPN
Site to Site VPNs
Using ISDN, Frame Relay or ATM
Designed to replace a WAN
Remote Access VPNs
Using the Internet
Provide remote access to mobile or branch
employees
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5User VPN User-to-LAN connection used by a company that has
employees who need
to connect to the private network from various remote
locations.
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Site VPN
Through the use of dedicated equipment and
large-scaleencryption, a company can connect multiple fixed
sitesover a public network such as the internet. Each siteneeds
only a local connection to the same public network.
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Four Protocols Used in VPN
PPTP -- Point-to-Point Tunneling Protocol
L2TP -- Layer 2 Tunneling Protocol
IPsec -- Internet Protocol Security
SOCKS is not used as much as the ones above
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Extend geographic connectivity
Reduce operational costs versus traditional WAN
Reduce transit times and traveling costs for remote users
Simplify network topology
Provide global networking opportunities
Provide telecommuter support
Benefits of VPN
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Disadvantages of VPN
VPNs require an in-depth understanding of public network
security issues and proper deployment of precautions.
Availability and performance depends largely outside of
their
control.
Immature standards
VPNs need to accommodate protocols other tan IP and existing
internal network technology.
