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RAS and VPN

Posted on 2001-08-03
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Last Modified: 2008-03-04
Hi,

May I know what are the differences between RAS and VPN ?

may i know which one is better and how can I get more information about the differences?

may i know how to setup it up?

thanks
'
hoay fern
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Question by:hoayfern
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by:izwiz
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RAS is Remote Access Service, it is basically the server side of dial up networking.

VPN's are virtual private networks.  These are 'tunnelled' connections that use a network, normally the internet, to provide an encrypted network link that effectively allows the client to access resources on a remote network.

You really ought to post these questions in the networking area though.
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by:kiranghag
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simply said, you first make a connection using RAS and then use VPN to tunnel through it ;-)
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by:hoayfern
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hi,

any good webiste for me to review it ?

hoay fern
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by:izwiz
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http://kubarb.phsx.ukans.edu/~tbird/vpn.html

There is not much to say about RAS, except it is the process of connecting a computer to a remote computer or network (e.g. the Internet).

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by:kiranghag
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try www.whatis.com. BTW are u planning to accept my answer and awarding points, i would be happy, i am just short of a t shirt, not begging though
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by:magarity
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"am just short of a t shirt"
Check the news lately?  EE's suspended the shirt program until further notice while they rework the logistics (my guess this means: find funds to buy the things).

hoayfern,
You wrote: "may i know how to setup it up?"

I have to ask: is this for a company or your personal entertainment?  If it's for a company, my official (and only) recommendation is that you hire a computer consultant to set it up for you.  An improperly configured VPN creates a significant security risk and if this is a business network, you don't want a black hat hacker to take over the system, do you?

If this is just for fun, please supply a little more detail, like what operating systems are involved and how the machines in question are connected to the internet.

regards,
magarity
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by:hoayfern
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hi magarity,

actually i need to pass up an assisgnment regarding :

1)comparison between RAS and VPN
2)make a deciison which one is better to implment for a company, i mean in terms of company benefits.
3)advantages and disadvantages of VPN
4)advantages and disadvantges of VPN
5)How to setup RAS or VPN in WINNT - the company have leased line

pls assist

hoay fern
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by:hoayfern
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hi izwiz,

any inof regarding the comparision bet RAS and VPN ?

hoay fern
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by:magarity
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Ah, then your textbook should have all the answers you need.
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by:izwiz
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Ah hah, I get the point of the question now.

The big difference is that standard RAS connections are not encrypted, but are normally quite secure because they are made directly point to point over a communications network such as PSTN (Public Switched Telephone Network).  The point to point part of that statement is important, what happens using RAS, if you have branches say in the UK and in the states, is that one has to dial the other (over PSTN or ISDN, or whatever) to gain access.  Since this is over a long distance significant call charges may be built up.

In the case of a VPN, the call charges are avoided to an extent by the use of local (to the offices) ISP's.  Normally the connection to the ISP on either end will be relatively inexpensive.  This would be somewhat insecure for business critical data however, passing straight over the Internet, and would mean that any service required would have to be 'published' to the Internet as a whole.  This is quite obviously a BAD thing.  What VPN's do though, is create an encrypted 'tunnel' over the public internet, so that both sides see each other as if they were part of the same network.

There's your comparison.

Question 2: It really all depends on the companies requirements.  If the offices are geographically distant then VPN's are the way forward.
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by:hoayfern
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hi izwiz,

may i know what are the devices that we need in order to setup RAS or VPN ?

pls assist

hoay fern
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by:izwiz
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Well since VPN's assume you already have an internet connection via ras or leased line or something, they don't need any devices other than those required for the internet connection.  They do need client software and server software (or server hardware from a router) though.

RAS requires some form of modem (for PSTN) or terminal adaptor (for ISDN).
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by:hoayfern
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hi izwiz,

so u mean if we have leased line, we dont need any devices to setup VPN ?

hoay fern
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by:kiranghag
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answering c/o izviz, yes and no.
yes , if you lease the line to your destined network, why would you need to use VPN
No, if you lease the line to your local ISP and the destined network is not near ( out of country, state), then you would need VPN

Am I right?
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by:izwiz
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That is correct.

A leased line would normally be to your local Internet, and then you'd use VPN.

A leased line say from the UK to the States would be astronomical in cost, but from the UK to an ISP, much more reasonable.
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by:hoayfern
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hi izwiz,

i am not really understand what u mean regarding since we have leased line, we dont need any devices to setup VPN ?

currently my company have leased line from SingTel.

once we need to setup VPN, what i need ?

others than above diffrences between RAS and VPN, what are the others diffrences ?

hoay fern
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by:izwiz
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No differences other than explained above.  To setup VPN you need to be running a server (Windows NT server comes with the VPN connection), and a client (either in a router, or as software -search the web for VPN client, or Win 2000 comes with one).
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by:hoayfern
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hi izwiz,

in your previous answer said abt the differences between RAS and VPN.

i am not understand regarding this term : PSTN (Public Switched Telephone Network).  

in your answer, the major diffrences between RAS and VPN is the call charges, am i right ?

is it mean that if we use VPN will be cheaper than use the RAS ?

the call charges of RAS is expensive than VPN, may i know is it in terms of client side ? like client have to dial-up using RAS will be more expensive than using VPN ?

thanks

hoay fern
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by:izwiz
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It depends.  If the office is across the street, then VPN has no use really.  If, however there are long distance call charges, and it's cheaper to call an ISP locally, then VPN's are useful.  Also if the two offices have leased lines already, then VPN is the way to go.

Yes, call charges would be incurred by the client making the RAS dial up connection.

PSTN literally just means the telephone network.
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by:hoayfern
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hi izwiz,

my company have SingNet Leased Line 128Kbps (Volume -based).

may I know:

1)is it Ok that we setup VPN using the Leased Line 128Kbps bandwith ? will it be too slow or cant support ?
is it we need another leased line for VPN or can use existing Leased Line 128Kbps ?

2)i have follow the steps setup the VPN according the books but also configure the client side according the book.

i try to login at client side using dial-up connection and VPN connection.

i success dial-up to ISP but when it connects to my server using the VPN connection that i have setup.

the error message said that :
error 678 There was no answer.

my client side is using win2000 professional.

question: how can i test whether my VPN server is working or not ?

How can i test whether is there any connection between client and VPN server ?

3)May I know is it we need 2 network card for our VPN server, one is connecting the server to, the other one is connecting to internet ??

please assists

hoay fern
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by:kiranghag
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no you do not require two cards, the term virtual means that. a software adaptor is set for the connection.
the steps for setting up the connection are in the windows help file somewhere.
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by:ComTech
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Hi all,

This question has been open for quite awhile. I am going to allow feedback from the questioner and experts. If it is not resolved, I will delete or accept an answer based on the info I have been given. Experts, feel free to offer input, or even suggest who you  think is correct. I will monitor this question for a period of 5-7 days and come back and evaluate this question.

Questioner, if you were helped, chooses whom you would like to award the question to, and Accept Comment.  It is your responsibility to complete this question.

Thank you,
ComTech
Community Support

PLEASE DO NOT ACCET THIS COMMENT AS AN ANSWER
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ComTech earned 0 total points
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Time to close this abandoned question.

ComTech
CS @ EE


Homework assignment.
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