Intercel ESAM Bedienungsanleitung

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PPTP VPN

USER GUIDE

A VPN (Virtual Private Network) is a method for securely connecting two devices together on a single network

across the internet. Packets from one device are encrypted and then sent over the network to the second device,

where the packets are decrypted and read. As a result, both devices appear to be on the same network with each

other and can communicate as is they were both plugged into the same router.

This guide will explain how to configure a Windows-based PPTP Host, using an eSAM Modem as the internet

gateway. It will also explain how to configure a separate eSAM to act as a client for the Windows PPTP Host.

While this is specifically geared towards a Windows PPTP VPN, many other VPN configurations are possible

using the eSAM. This guide can be thought of as an introduction to VPN’s on the eSAM generally.

First, we will configure the eSAM Modem we will use to connect the PPTP Host to the internet.

1. Connect the Windows PPTP Server to your modem, and then use your web browser to open the Modem’s

web interface. Out of the box, this is accessible on port 192.168.1.1

Insert your SIM, and check that your ISP has provided you with a public IP Address. A Public IP Address is an

IP Address that is visible from the internet. It is necessary for your PPTP Server to have a public IP Address,

so Clients will be able to find it over the Internet.

Public IP Addresses are any addresses that are not in any of the following ranges:

10.x.x.x

192.x.x.x

It is not required for clients to have a Public IP Address, only the Host needs to have one.

If your eSAM Modem does not have a public IP Address, or if it is unable to connect to the ISP please ensure you

have entered the correct APN under the Network > Modem window.

2. Once you have confirmed that your eSAM is accessible over the internet, you must now configure the port

forwarding. Port Forwarding specifies to the Modem where it should send packets when they arrive from the

Internet. In this case, we want to route packets related to hosting VPN’s to your Windows Machine, as it will

be responsible for running the PPTP Host.

To configure port forwarding, select the Forward > NAT Screen

Press ‘Add’ to enter a new Port Forwarding rule.

We need to add a new port forwarding rule for each Port we wish to forward. For PPTP, there are two ports

we need to forward:

Port Number

Protocol

1723

TCP

UDP

For both rules, we want to leave the other options set as follows:

Field Name

Value

Original Address Type

Interface

Modem

Mapping Address

IP Address of the PPTP Host Computer

Please note the IP Address of your computer using the ipconfig command, or similar.

Once all are entered, your NAT Screen should have the following rules:

Note: Mapping Address will be set to the PPTP Host’s LAN IP Address. For troubleshooting purposes, it may

sometimes be useful to forward all ports. In this case, leave the Original and Mapping Port options blank.

3. Now that the PPTP host is visible from the internet, we can enable the PPTP Host functionality within

windows.

Open the Windows Settings Window

Under settings, select the ‘Network & Internet’ Option

From the Network and Internet Screen, select ‘Change adapter options’

Press the ‘Alt’ key to open the file menu, then select File > New Incoming Connection

Select the users you wish to be able to connect to the VPN. Whenever an outside client connects to the VPN

Host, it must use this users login details to connect to the Host Machine.

If you don’t want to use a pre-existing login, you can add a new user using the ‘Add someone’ option.

Leave the ‘Through the Internet’ option enabled and press Next.

Select the ‘Internet Protocol Version 4 (TCP/IPv4)’ option, and press properties

Choose ‘Specify IP addresses’ and enter a suitable range of addresses. This will cause the Windows PPTP

Host to assign an IP Address to each Client that connects to it.

Press OK once configured, then ‘Allow Access’.

This should add an ‘Incoming Connections’ Icon to the network adapter screen. This confirms that your PPTP Host is

now enabled.

If you want to verify the host configuration before continuing, you can connect to the Windows PPTP Host using either

an Android phone, iPhone or another Windows Computer.

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