TP-Link SafeStream TL-ER6120 Manual

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How to configure VPN function on TP-LINK Routers
1. VPN Overview................................................................................................................ 2
2. How to configure LAN-to-LAN IPsec VPN on TP-LINK Router........................................ 3
3. How to configure GreenBow IPsec VPN Client with a TP-LINK VPN Router................ 13
4. How to configure Shrew Soft VPN IPsec Client with TP-LINK Router.......................... 23
5. How to configure LAN-to-LAN L2TP/PPTP VPN on TP-LINK Router ............................ 34
6. How to configure a PPTP Server on TP-LINK Router ................................................... 41
7. How to configure a L2TP Server on TP-LINK Router.................................................... 53

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1. VPN Overview
VPN (Virtual Private Network) is a private network established via the public network,
generally via the Internet. However, the private network is a logical network without any
physical network lines, so it is called Virtual Private Network.
With the wide application of the Internet, more and more data are needed to be shared
through the Internet. Connecting the local network to the Internet directly, though can allow
the data exchange, will cause the private data to be exposed to all the users on the Internet.
The VPN (Virtual Private Network) technology is developed and used to establish the private
network through the public network, which can guarantee a secured data exchange.
VPN adopts the tunneling technology to establish a private connection between two
endpoints. It is a connection secured by encrypting the data and using point-to-point
authentication. As the packets are encapsulated and de-encapsulated in the Router, the
tunneling topology implemented by encapsulating packets is transparent to users.
The tunneling protocols supported by TP-LINK Routers are as below:
Product Model
Tunneling Protocol
TL-ER6120
IPsec、PPTP、L2TP
TL-ER6020
IPsec、PPTP、L2TP
TL-ER604W
IPsec、PPTP、L2TP
TL-R600VPN
IPsec、PPTP

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2. How to configure LAN-to-LAN IPsec VPN on TP-LINK Router
Suitable for: TL-ER6120, TL-ER6020, TL-ER604W, TL-R600VPN
To setup an IPsec VPN tunnel on TP-LINK routers you need to perform the following steps:
A. Connecting the devices together
B. Verify the settings needed for IPsec VPN on router
C. Configuring IPsec VPN settings on TL-ER6120 (Router A)
D. Configuring IPsec VPN settings on TL-R600VPN (Router B)
E. Checking IPsec SA
NOTE: We use TL-ER6120 and TL-R600VPN in this example, the way to configure IPsec VPN
on TL-ER6020/TL-ER604W is the same as that on TL-ER6120.
A. Connecting the devices together
Before setup a VPN tunnel, you need to ensure that the two routers are connected to the
Internet. After ensuring that there is an active Internet connection on each router, you need
to verify the VPN settings of the two routers, please follow the instruction below.
B. Verify the settings needed for IPsec VPN on router
To verify the settings needed on the two routers, please login the router’s management
webpage.
Router A’s Status page:

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Router B’s Status page:

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C. Configuring IPsec VPN settings on TL-ER6120 (Router A)
Step 1 : On the management webpage, click on VPN then IKE Proposal.
Under IKE Proposal, enter Proposal Name whatever you like, select Authentication,
Encryption and DH Group, we use MD5,3DES, DH2 in this example.
Step 2 : Click on Add.

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Step 3 : Click on IKE Policy, enter Policy Name whatever you like, select Exchange Mode, in
this example we use Main, select IP Address as ID Type.
Step 4 : Under IKE Proposal 1, we use test1 in this example. Enter Pre-shared Key and SA
Lifetime you want, DPD is disabled.
Step 5 : Click on Add.
Step 6 : Click on IPsec on the left menu, then IPsec Proposal. Select Security Protocol, ESP
Authentication and ESP Encryption you want to enable on VPN tunnel. Here we
use ESP, MD5 and 3DES for example.

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Step 7 : Click on Add.
Step 8 : Click on IPsec Policy, enter Policy Name whatever you like, the Mode should be LAN-
to-LAN. Enter Local Subnet and Remote Subnet.
Step 9 : Select WAN you use and type in Remote Gateway. In this example, the Remote
Gateway is Router B’s WAN IP address, 218.18.1.208.
Step 10 : Look for Policy Mode and select IKE.
Step 11 : Under IKE Policy, we select test1 which is used.
Step 12 : Under IPsec Proposal, we use ipsec1 in this example.

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Step 13 : Look for PFS, we set NONE here, under SA Lifetime, enter “28800” or the period
you want.
Step 14 : Look for Status then select Activate
Step 15 : Click on Add.
Step 16 : Select Enable then click on Save.

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D. Configuring IPsec VPN settings on TL-R600VPN (Router B)
Step 1 : Go to IPsec VPN -> IKE, click on Add New
Step 2 : Enter Policy Name whatever you like, here we use test2. Exchange Mode,
select Main.
Step 3 : Authentication Algorithm and Encryption Algorithm are the same with Router A, we
use MD5 and 3DES in this example.

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Step 4 : DH Group, select DH2, the same with Router A.
Step 5 : Enter Pre-share Key and SA Lifetime, make sure that they are the same with Router
A.
Step 6 : Click on Save.
Step 7 : Click on IPsec on left side, click on Add New.
Step 8 : Enter Policy Name, we use ipsec2 in this example.
Step 9 : Enter Local Subnet and Remote Subnet, and then enter Remote Gateway, it’s Router
A’s WAN IP address, 218.18.0.233.