What is VPN?
Virtual private network
It is a logical secured tunnel
establishes between networks in unsecured network
Public network is unsecured network
The secured networks can
communicate via internet with security using VPN
The end network devices take care
of encapsulation/encryption of packets
With VPN, networks can have
security equal to private network security
Benefits of VPNs:
Ø Security:
Security is
provided through data encryption to protect confidentiality
Ø Cost:
VPN reduce WAN
infrastructure cost of a company
Ø Bandwidth:
Inexpensive high
bandwidth connections, such as DSL can be used to interconnect offices to allow
fast and secure access to corporate offices
Ø Scalability:
Companies can easily
add large number of users and offices without building significant WAN
structure
VPN Types
VPNs fall under two implementation types
·
Site to site VPN
·
Remote access VPN
Site to
site VPN:
Ø Site
to site VPNs, sometimes called as LAN-to-LAN or L2L VPNs
Ø Connect
two locations or sites together (similar to P2P wan connectivity)
Ø Two
intermediate devices (VPN gateways) protect the traffic between two LANs
Ø The
original IP packet from one LAN is encrypted by one gateway, forwarded to
destination gateway and then decrypted and forwarded to the local LAN
Ø Traffic
is protected by IPSec protocol
Site to Site VPNs
are two types
·
Intranet: VPN between sites belong to same
company
·
Extranet: VPN between sites belong to different
companies
Remote access VPN:
Ø VPN
connectivity between a site and remote user
Ø Remote
access VPN is used by mobile users to have the connectivity with site
Ø The
can have access to resources as they are in site
Ø VPN
software is required in the PC to access site (Cisco VPN client)
Ø Traffic
is protected by protocols like IPSec,
SSL, PPTP, L2TP
Ø Remote
access VPN has two implementations
·
Easy VPN
·
Web VPN
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