How to access a VPN server with a private IP address?

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I'm new to VPN so please bear with me if I do any mistake. Earlier I also posted this question but no luck.

What I know: How to create a VPN connection on the client.

What I want: In order to access the server I need its IP address but since I'm accessing the company's server, the IP address of the server is not public, but private. The ISP has given five set of public IP addresses to the company, but I don't know how to give that public IP address to the server or any other peer connected to the server. It's a small firm so the server does not have any DNS on the Internet.

Please give me some suggestions. If possible give me some videos as well giving a complete description of the process. You can also suggest me some books but only on Windows setup and not for Linux. In some books I have also studied OpenVPN and closeVPN, what is it?

sumit

Posted 2010-09-07T08:17:29.540

Reputation: 153

Answers

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You need to reconfigure your router to forward ports from public IP addresses to the server private IP address.

Traffic goes: Internet public IP address (one of five IP addresses the ISP provided you) -> router -> server (private IP address).

Depending on your needs, you need to forward the following ports from the public IP address to the server private IP address on the router side:

PPTP VPN uses TCP Port 1723

IP Protocol 47 (GRE)

L2TP: UDP Port 1701

IPSec: UDP Port 500

Pass IP protocol 50 and 51.

Note: 47 is a protocol number and not a TCP port. The protocol name is GRE. The Generic Route Encapsulation (GRE) protocol is used in conjunction with Point-to-Point Tunneling Protocol (PPTP) to create virtual private networks (VPNs) between clients or between clients and servers. It'll make a big difference when configuring your firewall or router.

Note: On the client side, when you configure the VPN client, you need to use the public IP address.

Note: If you have a web based configured router (Linksys, Netgear, Firebox, SonicWALL, etc.) it's pretty simple.

But if you have a Cisco (PIX series or similar) it is a different story. You can configure cisco using the console COM port configuration or a Cisco web based manager. And on the client side use Cisco VPN client to connect.

Videos:

What kind of router do you have?

S.T.A.L.K.E.R.

Posted 2010-09-07T08:17:29.540

Reputation: 464

ok let me make it more clear.. – sumit – 2010-09-07T10:58:27.420

we have a linksys router and a switch.through the switch all the computers are connected through LAN and they have been assigned private IPs. – sumit – 2010-09-07T11:01:38.377

Ok, what kind of linksys model? Do you have linksys router on other end too? – S.T.A.L.K.E.R. – 2010-09-07T18:04:04.270

I m sorry its not linksys router It is WRT354 NETGEAR router. – sumit – 2010-09-07T19:50:28.423

as you told me that i need to forward the ports from public ip to private.how can i do that.my server is connected to switch only which in turn is connected to the netgear router. – sumit – 2010-09-07T19:52:01.967

please check one more time router brand and model, there are not WRT354 Netgear There is WRT54 Linksys. – S.T.A.L.K.E.R. – 2010-09-07T21:50:38.353

ok its wgr614 netgear – sumit – 2010-09-07T22:35:12.500

http://portforward.com/english/routers/port_forwarding/Netgear/WGR614/default.htm – S.T.A.L.K.E.R. – 2010-09-08T10:14:47.173

here is guide to setup port forwarding http://portforward.com/english/routers/port_forwarding/Netgear/WGR614/default.htm

– S.T.A.L.K.E.R. – 2010-09-08T10:15:06.560

u have been very patient with me..thnx for ur response..i ll follow these links nd if i need ny help i ll let u know – sumit – 2010-09-08T13:01:40.357

i m at home when i ll reach office then i ll perform these steps – sumit – 2010-09-08T13:27:01.450

in the link you have provided me there are two port numbers starting port and end port.how would i know about these ports – sumit – 2010-09-08T19:39:35.263

As you see one the picture is answering your question. the start port and end port are the same. Start port: 1723 End port 1723 for PPTP – S.T.A.L.K.E.R. – 2010-09-08T23:28:07.100

so do i need to do only PPTP? – sumit – 2010-09-09T00:14:32.890

i mean do i need to add only one service nameas pptp? – sumit – 2010-09-09T00:26:01.507

i have added the service with the following details – sumit – 2010-09-09T01:10:44.160

service name-pptp-vpn service type-TCP starting and Ending port-1723 server IP address-192.168.1.26...now my ISP has given us five public IPs..so which public IP would be assigned to this server. – sumit – 2010-09-09T01:13:29.193

do i need to create any vpn connection in my server to access it through client – sumit – 2010-09-09T01:19:20.410

on my server end i have made some changes...opened server manager>Roles>right click>click on routing and network enable>assigned the list of public IPs addresses..when i try to connect it through client having windows 7 it gives me an error 800 – sumit – 2010-09-09T03:06:33.267

point to check: server side: account what you want to allow VPN: properties:Allow remote access. on the server web browser: www.checkmyip.com what is IP address? On the client: VPN IP address has to be the same as result from www.checkmyip.com Account has to be same as you allow remote access on the server. Check it First:) – S.T.A.L.K.E.R. – 2010-09-09T10:41:31.020

OK i ll do it..you seem to be genius in networking..do you write books or do you have some links which can give me full learning about VPN...i want to become an expert in that area and i guess you can give me best guidance. – sumit – 2010-09-09T15:01:00.930

are you on facebook or anyother social website? – sumit – 2010-09-09T15:05:33.523

Asked: 2010-09-07T08:17:29.540

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Active: 2013-10-25T22:14:43.057