Port Order Changes and IP Configuration Issues on Realtek Multi-Port (4-Port) PCIe NICs

Q：Port Order Changes and IP Configuration Issues on Realtek Multi-Port (4-Port) PCIe NICs

A：Configure a Fixed IP Address Using DHCP Reservation (MAC Address Binding)

DHCP Reservation (also known as MAC Address Binding) allows a DHCP server to automatically assign a predefined IP address based on the MAC address of each network interface.

This approach eliminates the need to manually configure a static IP address while ensuring that each network port always receives the same IP address after a system reboot or network reconnection.

 

Obtain MAC Address

        │

        ▼

Configure DHCP Reservation

        │

        ▼

Enable DHCP on Windows

        │

        ▼

Verify Assigned IP Address

Procedure

Step 1. Obtain the MAC Address of Each Network Adapter

1.     Open Command Prompt (cmd) in Windows.

2.     Right-click Command Prompt and select Run as administrator.

3.     Execute the following command: getmac /v

4.     Record the MAC address of each Ethernet port. For example:

00-11-22-33-44-55

00-11-22-33-44-56

...

Step 2. Configure DHCP Reservation

1.     Log in to the management interface of your router or DHCP server.

2.     Locate the DHCP reservation feature. Depending on the device manufacturer, the feature may be named:

• Address Reservation
• DHCP Reservation
• Static Lease
• IP & MAC Binding

3.     Create a reservation entry for each network adapter by mapping its MAC address to the desired IP address.

MAC Address	Reserved IP Address
00-11-22-33-44-55	192.168.1.10
00-11-22-33-44-56	192.168.1.11

Step 3. Verify the Windows Network Configuration

1.     Open Control Panel.

2.     Navigate to:

Network and Internet → Network and Sharing Center

3.     Select Change adapter settings.

4.     Right-click the target Ethernet adapter and select Properties.

5.     Select Internet Protocol Version 4 (TCP/IPv4).

6.     Verify that Obtain an IP address automatically is selected.

Step 4. Verify the Configuration

1.     Confirm that the DHCP server contains reservation entries for all required MAC addresses.

2.     Reconnect the network cable or restart the system.

3.     Verify that each Ethernet port receives its assigned reserved IP address.

If the configuration is successful, the DHCP server will automatically assign the same IP address to each network adapter based on its MAC address whenever the system reconnects to the network.

Expected Result

After completing the configuration:

• Each Ethernet port automatically receives its assigned IP address from the DHCP server.
• No manual static IP configuration is required on the client.
• The assigned IP address remains consistent across system reboots and network reconnections.