Question

Create VPN connections with Indy / Delphi

Asked by: Sunsales

I want to simultaneously connect  to 5 different VPN networks from Delphi, and access web servers there, using Delphi and Indy's MyIDHttp. Is this possible?

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Asked On
2009-07-27 at 00:45:29ID24602134
Tags

delphi

,

indy

Topic

Delphi IDE

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: developmentguruPosted on 2009-07-27 at 13:06:20ID: 24955429

 Generally the connections to the VPN require using installed VPN software on the system or windows build in VPN software.  If the VPN is through windows then you can order a VPN connection to connect using the shell.  There are issues with this kind of auto connecting.  Will there be a user on this system?  Will he need to be connected to a VPN at any time?  Would you auto disconnect from the VPNs?  What about the user who would then complain that the VPN has been disconnected?

  In my case the VPN software does not have any automation interface.  I can try to send it commands via batch file, but thats about it.

  Until I know more about your environment (Is your company the owner of the VPNs?, what brand are they?, what are you ultimately trying to accomplish?) It will be difficult to help more.

 

by: SunsalesPosted on 2009-07-29 at 07:44:57ID: 24970685

developmentguru,

There will be no user on "our" end. Its a 100% automated task that connects to a vpn network and download some information from some web servers (sales reports etc). My current options are to either connect to the networks one by one or to have 5 computers doing it simultaneously. But if i can open 5 connections at the same time i only need 1 computer.

I suspect that i can have many VPN connections from windows open at the same time, but how can i tell Delphi/Indy witch to use?

 

by: developmentguruPosted on 2009-07-29 at 09:22:10ID: 24971799

 Once a VPN connection is open I use either an IP address or a machine name to specify the box I want to communicate with.

  You can have several VPN connections open at once.  You may run into issues if you have multiple open and there are IP address overlaps between the various networks you are connecting to.  It will be safer to do one at a time, if you are not in control of the networks you connect to in this manner.

 

 

by: SunsalesPosted on 2009-08-04 at 07:25:35ID: 25014139

Ok, i think i understand a little bit more now, just one final question. How do i programatically from Delphi open and close a specific VPN connection (already created in windows).

 

by: developmentguruPosted on 2009-08-04 at 08:00:59ID: 25014503

To dial a windows VPN connection (dial IS the correct term) you would use the RAS API.  Here are some links with examples.

http://www.experts-exchange.com/Progrhttp://delphi.about.com/gi/dynamic/offsite.htm?

http://delphi.about.com/gi/dynamic/offsite.htm?zi=1/XJ/Ya&sdn=delphi&cdn=compute&tm=14&f=22&tt=14&bt=1&bts=1&zu=http://web.archive.org/web/20040613140908/http://www.kyler.com/pubs/ddj9855.php

If this is not a Windows VPN then you will probably need to go through the API for your specific VPN.

 

by: SunsalesPosted on 2009-08-04 at 11:29:25ID: 25016649

Ok, i will look into that. I was hoping for a simple solution like:

"tell network connections to open connection name 'alpha';

"tell network connections to close connection name 'alpha';

 

by: developmentguruPosted on 2009-08-04 at 17:54:12ID: 25019508

RAS will allow you to do that and while it is not quite as simple as you wanted, it's not too bad either.

20120131-EE-VQP-002

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