Module 11: Configuring Internet Access for a Windows Server Network: NAT, DHCP, and Routing Setup

Configuring internet access for a network in Windows Server involves setting up routing, NAT (Network Address Translation), and DHCP so that internal devices can connect to the internet securely and efficiently through a single server gateway.

Step-by-Step Guide to Configuring Internet Access

✅ 1. Server Requirements

  • Two NICs (Network Interface Cards):

    • Internal NIC (e.g., 192.168.10.1)

    • External NIC (connected to modem/ISP with public IP or DHCP)

  • Windows Server with RRAS role installed

✅ 2. Install and Configure RRAS (Routing and Remote Access Service)

▶️ Install Remote Access Role

Configure RRAS:

  1. Open: Server Manager → Tools → Routing and Remote Access

  2. Right-click server → Configure and Enable Routing and Remote Access

  3. Choose:

    • NAT and LAN Routing

  4. Complete the wizard and start the service

3. Configure NAT

  1. In RRAS Console, expand:

    • IPv4 → NAT

  2. Right-click the external interface → Properties

    • ✅ Check: “Enable this interface for internet sharing (NAT)”

  3. Right-click the internal interface → Properties

    • 🔘 Select: “Private interface connected to private network”

4. Set DHCP on Clients (Optional)

  • Configure the Windows Server DHCP role or assign static IPs manually

  • Default gateway for clients: 192.168.10.1 (internal NIC of server)

  • DNS server: Public DNS (e.g., 8.8.8.8) or local DNS

5. Test Internet Access

  • Use a client on the internal network:

    • Ping: 8.8.8.8

    • Browse websites

  • Use tracert or ipconfig to verify routing

Options for Connecting a Network to the Internet

  • Connecting to the Internet by Using a Router
  • Optimizes network performance
  • Enables all users in your network to share a single connection to the Internet
  • Is the easiest method for connecting your network to the Internet
RRAS NAT routing diagram
  • Securing Internet Connections by Using a Firewall
  • Prevents unauthorized access to your network
  • Enables you to specify the type of traffic that is allowed into and out of your network
Firewall
  • Connecting to the Internet by Using NAT
  • The client sends the packet to the computer running NAT
  • The computer running NAT changes the packet header and sends the packet over the Internet to the Web server
  • The Web server sends a reply to the computer running NAT
  • The computer running NAT determines the destination, changes the packet header, and sends the packet to the client
Windows Server internet gateway configuration
  • Connecting to the Internet by Using Internet Connection Sharing
  • Simplifies the process of configuring NAT
  • Enables small-office and home-office networks to share a single connection to the Internet
home-office networks
  • Connecting to the Internet by Using a Proxy Server
  • NAT vs. Routing
  • NAT vs. Proxy Server
  • Internet Connection Sharing vs. NAT
configure Windows server routing and NAT

How to Configure Internet Access Using a Router in Windows Server Networks

Configuring internet access using a router involves connecting the local network to the internet through a physical or software-based router, assigning correct IP addressing, and configuring NAT and DNS so that client devices can browse the web securely and efficiently.

Step-by-Step Guide: Configuring Internet Access Using a Router
1. Connect the Router to the Network

  • WAN port → Connects to the internet (e.g., DSL/Cable modem)

  • LAN ports → Connects to the internal switch or server

2. Access Router Configuration Panel

  • Open browser on a connected device

  • Go to: http://192.168.0.1 or http://192.168.1.1 (default gateway)

  • Login using admin credentials (usually on the router label)

3. Configure WAN Settings

  • Choose DHCP, Static IP, or PPPoE depending on ISP

  • Save and test connectivity

4. Configure LAN Settings

  • Assign router LAN IP: e.g., 192.168.10.1

  • Enable DHCP Server:

    • IP range: 192.168.10.100 – 192.168.10.200

    • Subnet mask: 255.255.255.0

    • DNS: 8.8.8.8 and 8.8.4.4 or local DNS server

  • Save settings

5. Connect Windows Server and Clients

  • Assign static IP to Windows Server if required:

    • IP: 192.168.10.2

    • Gateway: 192.168.10.1 (router)

  • Clients can use DHCP or static IP with the same gateway

6. Test Internet Access

  • On any client or server:

    • Run ping 8.8.8.8

    • Check internet browsing

    • Use ipconfig and tracert for verification

home router DHCP configuration

Configuring Internet Access Using NAT in Windows Server (RRAS Setup Guide)

Network Address Translation (NAT) allows multiple devices on a private network to access the internet through a single public IP. In Windows Server, NAT can be configured using RRAS to share internet access efficiently and securely.

Step-by-Step Guide: Configuring NAT in Windows Server
1. System Requirements

  • Windows Server (2016/2019/2022)

  • Two network interfaces:

    • Internal NIC: Connected to LAN (e.g., 192.168.10.1)

    • External NIC: Connected to ISP or public internet (DHCP/static)

2. Install RRAS Role

Use Server Manager or PowerShell:

3. Configure NAT Using RRAS
➤ Open RRAS:

  • Go to Server Manager → Tools → Routing and Remote Access

➤ Configure RRAS:

  • Right-click the server → Configure and Enable Routing and Remote Access

  • Choose:

    • NAT and LAN Routing

    • Complete the wizard and start the RRAS service

4. Configure NAT Interfaces
➤ External Interface (Connected to Internet):

  1. Expand IPv4 → NAT

  2. Right-click → New Interface

  3. Choose the external NIC

  4. Select:

    • Public interface connected to the internet

    • Enable NAT on this interface

➤ Internal Interface (LAN):

  1. Add the internal NIC to NAT as well

  2. Choose:

    • Private interface connected to private network

5. Configure Clients

  • Assign static IP or DHCP in the LAN

  • Set gateway to internal server IP (e.g., 192.168.10.1)

  • Set DNS to 8.8.8.8 or local DNS

6. Test Connectivity

On a client machine:

  • Run ping 8.8.8.8 — should succeed

  • Open a browser — internet should work

  • Use ipconfig and tracert to verify routes

  • Installing NAT
configure NAT RRAS Windows
  • Configuring NAT
Windows Server LAN to internet configuration
  • Installing the Router Interface for NAT

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