L2TP/IPsec VPN On Windows Server 2016 VPN On Windows Server 2016 Step By Step| Complete Lab Step 3:...

http://abdelwahed.me

L2TP/IPsec VPN On Windows Server 2016

Complete Lab (V2.0)

Ahmed Abdelwahed

MCT

[email protected]

http://abdelwahed.me/

mailto:[email protected]

L2TP/IPsec VPN On Windows Server 2016 Step By Step| Complete Lab


Table of Contents What is VPN? ................................................................................................................................................................... 3

Existing Active directory environment ............................................................................................................................ 3

Existing DHCP Server Configuration: ............................................................................................................................... 4

VPN Server Setup and Configurations ............................................................................................................................ 5

VPN Configuration Steps: ............................................................................................................................................ 6

Step 1: Join VPN Server to ITPROLABS.XYZ domain ................................................................................................. 6

Step 2: Add Remote Access role .............................................................................................................................. 6

Step 3: Enable and configure routing and remote access (Enable VPN Service) ................................................... 10

Step 4: Allow VPN clients to obtain TCP/IP configuration from DHCP and use internal DNS................................. 12

Step 5: Configure a preshared key for IPSec connection ....................................................................................... 13

Allowing internet users to connect through VPN ......................................................................................................... 15

Step 1: Active Directory Configuration ..................................................................................................................... 15

Step 2: Configure the Remote Access policies (NPS) ................................................................................................ 17

Testing ........................................................................................................................................................................... 23

Create VPN connection from windows 10 Client. ..................................................................................................... 23

Allow internet connectivity with VPN ....................................................................................................................... 25

Connect to VPN ......................................................................................................................................................... 26

Check connected VPN client Status .......................................................................................................................... 28




What is VPN? A Virtual Private Network (VPN) is a secure network tunnel that allows you to connect to your private

network from internet locations. So, you can access and use your internal resources based on your

permissions.

Existing Active directory environment 1. OS: Windows server 2016

2. Domain Name: ITPROLABS.XYZ

3. Domain IP: 192.168.153.10/24

4. IP Scheme: 192.168.153.0/24

Full Windows Server 2016 Active directory lab: https://gallery.technet.microsoft.com/Install-Windows-Server-f37e3c6d?redir=0


https://gallery.technet.microsoft.com/Install-Windows-Server-f37e3c6d?redir=0



Existing DHCP Server Configuration: VPN clients will contact the DHCP server to obtain our internal TCP/IP configuration so they can

access internal resources, the DHCP server configuration explained as below: 1. Server IP: 192.168.153.10/24

2. Scope range: 192.168.153.50 – 192.168.153.254

3. DG: 192.168.153.2

4. DNS: 192.168.153.10

Full Windows Server 2016 DHCP lab:

https://gallery.technet.microsoft.com/Installing-and-Configuring-bf727a5f?redir=0


https://gallery.technet.microsoft.com/Installing-and-Configuring-bf727a5f?redir=0



VPN Server Setup and Configurations Server Name: VPN

LAN IP: 192.168.153.11/24

WAN IP: public IP address

Network configuration:

We have 2 network interfaces one for LAN connectivity (in our domain scope) and another for WAN that will

receive VPN client connection requests from internet.




VPN Configuration Steps:

Step 1: Join VPN Server to ITPROLABS.XYZ domain

First, Join our VPN server to ITPROLABS.XYZ domain, so we can use active directory to authenticate the

incoming VPN client connections.

Step 2: Add Remote Access role

On VPN server, from Server Manager add remote access role as explained in the figures below













Step 3: Enable and configure routing and remote access (Enable VPN Service)

1. On VPN, from Server Manager, open Routing and Remote Access.

2. Right-click VPN (local), and then click Configure and Enable Routing and Remote Access

and follow the instructions as explained in the figures below







Step 4: Allow VPN clients to obtain TCP/IP configuration from DHCP and use internal DNS




Here we will allow incoming VPN clients to obtain TCP/IP configuration from DHCP, also It’s better to allow VPN users

to use the internal DNS server, so they can locate and access internal resources easily

Step 5: Configure a preshared key for IPSec connection

On VPN server configure preshared key that will be used in IPSec connections




Disable PPTP connections

By default, VPN Server can receive 128 concurrent PPTP, SSTP and L2TP connections, you can increase this number of

concurrent connections or decrease it or disable it by decrease the mentioned number - 128 - to zero, as explained

in the figures below




Allowing internet users to connect through VPN

Step 1: Active Directory Configuration Create active directory group to only allow members of this group to connect through VPN, to do this

from active directory users and computers we will create active directory group (VPN_Users) and add

member user to it (aabdelwahed) so we can use him as user testing. The following instructions are

configured on ITPROLABS.XYZ domain (DC01)




Now you can add members to this group that you want to allow them to connect through VPN




Step 2: Configure the Remote Access policies (NPS) Users you want to allow them to connect through VPN must have grant access permission from Network policy

Server or give users dial in grant access (One by one) permission from active directory users and computers wizard,

in our scenario we will configure this permission through Network Policy Server (NPS) to allow members of

VPN_Users group (Bulk Users) that we just created in active directory to access the network through VPN. the

following steps configured on VPN Server.

On VPN, from Server Manager, open the Network Policy Server console







add users and groups that you want to allow them to connect through VPN




from this wizard, we can apply some polices and restrictions on VPN clients like session time limit.




Configuration summary




Make sure that your created policy order is 1




Testing

Create VPN connection from windows 10 Client. First, create VPN connection to VPN Server public IP address (as explained in the figures below)




Now, configure our connection to use L2TP (as explained in the below figures)




Allow internet connectivity with VPN By default, the connected to VPN clients can’t browse internet to solve this issues solved as explained in

the figures below.




Connect to VPN Now you can use your VPN connection using aabdelwahed user who have grant access permission to

connect through VPN according to his membership on VPN_Users group.




Now, run ipconfig /all to check your VPN connection configuration, so now you can access the network

resources based on your permissions.




Check connected VPN client Status Now back to VPN server to check status of connected users also you can force disconnect any

connected users as explained in the figures below.


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L2TP/IPsec VPN On Windows Server 2016 VPN On Windows Server 2016 Step By Step| Complete Lab Step 3:...

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