A multihomed computer has more than one network adapter card or embedded network chip and port installed. Configuring a multihomed computer, in most cases, requires additional settings to ensure that the computer sends information to the intended destination hosts on the network without errors. By adding additional parameters to the network adapter configuration of a multihomed computer, you can avoid errors related to dual network connections.
Instructions
1-
Click "Start" and the "Search" box. Type "ncpa.cpl" (without quotation marks) and press the "Enter" key. The "Network Connections" window will appear.
2-
Right-click on the first network adapter and click the "Properties" item in the menu that appears. Scroll down the list of protocols and double-click on the "Internet Protocol Version 4 (TCP/IPv4)" selection. The "Internet Protocol Version 4 TCP/IPv4 Properties" window will appear.
3-
Click the "Obtain an IP address automatically" radio button and then click "Obtain a DNS server IP address automatically" if the network supports dynamic assignment of IP addresses (DHCP). If the network does not support dynamic IP address assignment, then click the "Use the following IP address" radio button and then click "Use the following DNS server addresses" radio button. Type in the IP address, subnet mask, default gateway IP address and DNS server IP address that are assigned to the first network adapter in the fields provided.
4-
Click the "Advanced" button. The "Advanced TCP/IP Settings" window will appear. Uncheck the "Automatic metric" box and then type a "1" in the "Interface metric" field if network services used most often by the computer are located on the network connected to the first network adapter. Otherwise type a "2" in the "Interface metric" field.
5-
Click "OK" in the "Advanced TCP/IP Settings" window and then click "OK" in the "Internet Protocol Version 4 (TCP/IPv4)" window. Click "OK" in the "Local Area Connection" window to save the configuration.
6-
Configure the second network adapter following the same procedure as the first network adapter. In the "Advanced TCP/IP Settings" configuration window for the second adapter, ensure that the number typed into the "Interface metric" box is a "2" if the first network adapter "Interface metric" box value is a "1", or vice versa, so that the metric values are different for each network adapter and the network adapter with the "Interface metric" box value of "1" is connected to the network that provided the majority of the network services for the computer.
7-
Repeat the procedure above for each additional network adapter, assigning a number in the "Interface metric" box relative to the proportion of use and priority of the network to which the interface is connected.
8-
Click the "Start" button and then click the "Search" box. Type "cmd" in the box. Right-click on the command line icon that appears in the upper left pane and then click "Run as Administrator." On the command line, type "ipconfig /all" and press the "Enter" key. View the command line output and verify that the IP address, subnet mask and gateway IP address for each network adapter is different from the other network adapter.
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