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Remote Desktop Connection Problems with connecting by Dialup

I have a network at work using a LINKSYS Router. I have successfully set it up so that I can connect to through remote computer by any of the computers that are in the network. The reason I am setting this up is to be able to connect to a work computer from home using my laptop. All the computers at work have Windows XP Pro. I will be connecting to the internet by dialup and also a wireless network using my laptop. I have read numerous help files, and it continues to tell me to connect  but I have to have VPN server or a remote access server. I do not know what these are or how to set this up.
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dis1931

They will need to be setup at work...unless you are a network admin at your job then you will not have access to do this.  I would consult the IT department or MIS to find out if they already have VPN or RAS setup on the network.

Dis
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I am the IT Dept. We are a very small business. We do not have a VPN or RAS setup on the network.
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jodypeet

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Okay you lost me after #1.

What do you mean port 3389 etc.?

2. Port 3389 open through your firewall, and redirected to the target machine, be it a workstation or server.

How do I figure out what the  "outside IP address for work" is? I don't know what a "mx record" is either?
3. on the laptop open the remote desktop connection and point it at your outside IP address for work, or if you have an mx record you could point it at mail.yourcompany.com

thats the tcp port it communicates on ... like webpages run on port 80 ...
if you have a linksys firewall at the office it needs to know to redirect port 3389 traffic to the PC you want to connect to
also for point 3
from inside your network open a webpage to http://www.whatismyip.com this will tell you what your outside IP address is
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To add
there is a simple registry change to tell a PC to listen for rdp on a different port
you can then have one listening on 3389 another on 3390 ...etc etc.
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does it matter if we have dynamic ip's?
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what is the simple registry change i would have to make?
dynamic ip address' shouldn't be too much of a biggie... you'll just need to know what it is at the time you want to connect

to change the port a server or workstation listens on follow this
http://support.microsoft.com/default.aspx?scid=187623 
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thanks I figured it out from both of your answers