VIRTUAL PRIVATE NETWORKS (VPN) By s k satapathy s k satapathy clicktechsolution.com.

VIRTUAL PRIVATE VIRTUAL PRIVATE NETWORKS (VPN)NETWORKS (VPN)

By By s k satapathys k satapathy

clicktechsolution.comclicktechsolution.com

Traditional Connectivity Traditional Connectivity

[From Gartner Consulting][From Gartner Consulting]clicktechsolution.comclicktechsolution.com

What is VPN?What is VPN?Virtual Private Network is a type of private Virtual Private Network is a type of private

network that uses public telecommunication, network that uses public telecommunication, such as the Internet, instead of leased lines to such as the Internet, instead of leased lines to communicate.communicate.

Became popular as more employees worked in Became popular as more employees worked in remote locations.remote locations.

Terminologies to understand how VPNs work.Terminologies to understand how VPNs work.


Private Networks Private Networks vs. vs.

Virtual Private NetworksVirtual Private NetworksEmployees can access the network (Intranet) from remote Employees can access the network (Intranet) from remote

locations.locations.

Secured networks.Secured networks.

The Internet is used as the backbone for VPNsThe Internet is used as the backbone for VPNs

Saves cost tremendously from reduction of equipment Saves cost tremendously from reduction of equipment and maintenance costs.and maintenance costs.

ScalabilityScalabilityclicktechsolution.comclicktechsolution.com

Remote Access Virtual Private Remote Access Virtual Private NetworkNetwork

(From Gartner Consulting) clicktechsolution.comclicktechsolution.com

Brief Overview of How it WorksBrief Overview of How it Works

Two connections – one is made to the Two connections – one is made to the Internet and the second is made to the Internet and the second is made to the VPN.VPN.

Datagrams – contains data, destination Datagrams – contains data, destination and source information.and source information.

Firewalls – VPNs allow authorized users Firewalls – VPNs allow authorized users to pass through the firewalls.to pass through the firewalls.

Protocols – protocols create the VPN Protocols – protocols create the VPN tunnels.tunnels.


Four Critical FunctionsFour Critical FunctionsAuthenticationAuthentication – validates that the data was – validates that the data was

sent from the sender.sent from the sender.Access controlAccess control – limiting unauthorized users – limiting unauthorized users

from accessing the network.from accessing the network.ConfidentialityConfidentiality – preventing the data to be – preventing the data to be

read or copied as the data is being read or copied as the data is being transported.transported.

Data IntegrityData Integrity – ensuring that the data has – ensuring that the data has not been altered not been altered


EncryptionEncryptionEncryption -- is a method of “scrambling” Encryption -- is a method of “scrambling”

data before transmitting it onto the data before transmitting it onto the Internet.Internet.

Public Key Encryption TechniquePublic Key Encryption Technique

Digital signature – for authenticationDigital signature – for authentication


TunnelingTunneling

A virtual point-to-point connectionA virtual point-to-point connectionmade through a public network. It transportsmade through a public network. It transportsencapsulated datagrams.encapsulated datagrams.

Encrypted Inner Datagram

Datagram Header Outer Datagram Data Area

Original Datagram

Data Encapsulation [From Comer]

Two types of end points: Remote Access Site-to-Site


Four Protocols used in VPNFour Protocols used in VPNPPTP -- Point-to-Point Tunneling ProtocolPPTP -- Point-to-Point Tunneling Protocol

L2TP -- Layer 2 Tunneling ProtocolL2TP -- Layer 2 Tunneling Protocol

IPsec -- Internet Protocol SecurityIPsec -- Internet Protocol Security

SOCKS – is not used as much as the SOCKS – is not used as much as the ones above ones above


VPN Encapsulation of PacketsVPN Encapsulation of Packets


Types of ImplementationsTypes of ImplementationsWhat does “implementation” mean in What does “implementation” mean in

VPNs?VPNs?

3 types3 typesIntranet – Within an organizationIntranet – Within an organizationExtranet – Outside an organizationExtranet – Outside an organizationRemote Access – Employee to BusinessRemote Access – Employee to Business


Virtual Private Networks (VPN)Basic Architecture


Device TypesDevice Types

What it meansWhat it means

3 types3 types HardwareHardware FirewallFirewall SoftwareSoftware


Device Types: HardwareDevice Types: Hardware

Usually a VPN type of routerUsually a VPN type of router

Pros

• Highest network throughput

• Plug and Play

• Dual-purpose

Cons

• Cost

• Lack of flexibility


Device Types: FirewallDevice Types: Firewall

More security?More security?

Pros

• “Harden” Operating System

• Tri-purpose

• Cost-effective

Cons

• Still relatively costly


Device Types: SoftwareDevice Types: Software

Ideal for 2 end points not in same org.Ideal for 2 end points not in same org. Great when different firewalls implementedGreat when different firewalls implemented

Pros

• Flexible

• Low relative cost

Cons

• Lack of efficiency

• More labor training required

• Lower productivity; higher labor costs clicktechsolution.comclicktechsolution.com

Advantages Advantages VS.VS.

DisadvantagesDisadvantages


Eliminating the need for expensive long-distance Eliminating the need for expensive long-distance leased lines leased lines

Reducing the long-distance telephone charges Reducing the long-distance telephone charges for remote access. for remote access.

Transferring the support burden to the service Transferring the support burden to the service providers providers

Operational costsOperational costs

Cisco VPN Savings Calculator

Advantages: Cost SavingsAdvantages: Cost Savings


http://www.cisco.com/warp/public/779/largeent/learn/technologies/vpn/vpn_calc/vpnstart.html

http://www.cisco.com/warp/public/779/largeent/learn/technologies/vpn/vpn_calc/vpnstart.html

Flexibility of growth Flexibility of growth

Efficiency with broadband technology Efficiency with broadband technology

Advantages: ScalabilityAdvantages: Scalability


VPNs require an in-depth understanding of VPNs require an in-depth understanding of public network security issues and proper public network security issues and proper deployment of precautionsdeployment of precautions

Availability and performance depends on factors Availability and performance depends on factors largely outside of their control largely outside of their control

Immature standards Immature standards

VPNs need to accommodate protocols other VPNs need to accommodate protocols other than IP and existing internal network technology than IP and existing internal network technology

DisadvantagesDisadvantages


Applications: Site-to-Site VPNsApplications: Site-to-Site VPNs

Large-scale encryption between multiple Large-scale encryption between multiple fixed sites such as remote offices and fixed sites such as remote offices and central offices central offices

Network traffic is sent over the branch Network traffic is sent over the branch office Internet connectionoffice Internet connection

This saves the company hardware and This saves the company hardware and management expensesmanagement expenses


Site-to-Site VPNsSite-to-Site VPNs


Applications: Remote AccessApplications: Remote AccessEncrypted connections between mobile or Encrypted connections between mobile or

remote users and their corporate networksremote users and their corporate networksRemote user can make a local call to an ISP, as Remote user can make a local call to an ISP, as

opposed to a long distance call to the corporate opposed to a long distance call to the corporate remote access server. remote access server.

Ideal for a telecommuter or mobile sales people. Ideal for a telecommuter or mobile sales people. VPN allows mobile workers & telecommuters to VPN allows mobile workers & telecommuters to

take advantage of broadband connectivity. take advantage of broadband connectivity. i.e. DSL, Cable i.e. DSL, Cable


Industries That May Use a VPNIndustries That May Use a VPNHealthcare: Healthcare: enables the transferring of confidential patient information enables the transferring of confidential patient information

within the medical facilities & health care providerwithin the medical facilities & health care provider

ManufacturingManufacturing: allow suppliers to view inventory & allow clients to purchase : allow suppliers to view inventory & allow clients to purchase online safelyonline safely

Retail:Retail: able to securely transfer sales data or customer info between stores able to securely transfer sales data or customer info between stores & the headquarters& the headquarters

Banking/Financial:Banking/Financial: enables account information to be transferred safely enables account information to be transferred safely within departments & brancheswithin departments & branches

General Business:General Business: communication between remote employees can be communication between remote employees can be securely exchangedsecurely exchanged


Statistics From Gartner-Statistics From Gartner-Consulting*Consulting*

50%

63%

79%

90%

0% 20% 40% 60% 80% 100%

Access to network forbusiness

partners/customers

Site-to-site connectivitybetween offices

Remote access foremployees while

traveling

Remote access foremployees working out

of homes

% of Respondents

Percentages

*Source: www.cisco.com clicktechsolution.comclicktechsolution.com

Some Businesses using a VPNSome Businesses using a VPN

CVS Pharmaceutical Corporation upgraded their CVS Pharmaceutical Corporation upgraded their frame relay network to an IP VPNframe relay network to an IP VPN

ITW Foilmark secured remote location orders, ITW Foilmark secured remote location orders, running reports, & internet/intranet running reports, & internet/intranet communications w/ a 168-bit encryption by communications w/ a 168-bit encryption by switching to OpenReach VPNswitching to OpenReach VPN

Bacardi & Co. Implemented a 21-country, 44-Bacardi & Co. Implemented a 21-country, 44-location VPNlocation VPN


Where Do We See VPNs Where Do We See VPNs Going in the Future?Going in the Future?

VPNs are continually being enhanced. VPNs are continually being enhanced. Example:Example: Equant NV Equant NV

As the VPN market becomes larger, more As the VPN market becomes larger, more applications will be created along with applications will be created along with more VPN providers and new VPN types.more VPN providers and new VPN types.Networks are expected to converge to Networks are expected to converge to create an integrated VPNcreate an integrated VPNImproved protocols are expected, which Improved protocols are expected, which will also improve VPNs.will also improve VPNs.clicktechsolution.comclicktechsolution.com

Pop Quiz!Pop Quiz!

VPN stands for…a) Virtual Public Network b) Virtual Private Network

c) Virtual Protocol Network d) Virtual Perimeter Network

Q.1Q.1


http://compnetworking.about.com/library/nosearch/blincorrect.htm?012101_1a

http://compnetworking.about.com/library/tests/bl012101a1.htm

http://compnetworking.about.com/library/nosearch/blincorrect.htm?012101_1c

http://compnetworking.about.com/library/nosearch/blincorrect.htm?012101_1d

Pop Quiz!Pop Quiz!

A.1A.1

b) Virtual Private Network VPN stands for…

VPN stands for "Virtual Private Network" or "Virtual Private Networking." A VPN is a private network in the sense that it carries controlled information, protected by various security mechanisms, between known parties. VPNs are only "virtually" private, however, because this data actually travels over shared public networks instead of fully dedicated private connections.


http://compnetworking.about.com/library/tests/bl012101a1.htm

Pop Quiz!Pop Quiz!

What are the acronyms for the 3 most common VPN protocols?

Q.2Q.2


Pop Quiz!Pop Quiz!

A.2A.2

• PPTP• L2TP• IPsec

3 most common VPN protocols are…

PPTP, IPsec, and L2TP are three of today's most popular VPN tunneling protocols. Each one of these is capable of supporting a secure VPN connection.


Pop Quiz!Pop Quiz!

What does PPTP stand for?

Q.3Q.3


Pop Quiz!Pop Quiz!

A.3A.3

PPTP = Point-to-Point Tunneling Protocol !


Pop Quiz!Pop Quiz!

What is the main benefit of VPNs compared to dedicated networks utilizing frame relay, leased lines, and traditional dial-up?

Q.4Q.4

a) better network performance b) less downtime on average

c) reduced cost d) improved security


Pop Quiz!Pop Quiz!

A.4A.4

c) reduced costThe main benefit of VPNs is…

The main benefit of a VPN is the potential for significant cost savings compared to traditional leased lines or dial up networking. These savings come with a certain amount of risk, however, particularly when using the public Internet as the delivery mechanism for VPN data.


Pop Quiz!Pop Quiz!

In VPNs, the term "tunneling" refers to

Q.5Q.5

a) an optional feature that increases network performance if it is turned on

b) the encapsulation of packets inside packets of a different protocol to create and maintain the virtual circuit

c) the method a system administrator uses to detect hackers on the network

d) a marketing strategy that involves selling VPN products for very low prices in return for expensive service contracts


Pop Quiz!Pop Quiz!

A.5A.5

b) the encapsulation of packets inside packets of a different protocol to create and maintain the virtual circuit

In VPNs, the term "tunneling" refers to…


VIRTUAL PRIVATE NETWORKS (VPN) By s k satapathy s k satapathy clicktechsolution.com.

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