Multiple physical network interfaces on the same subnet may cause routing issues

Issue or symptom

While the server receives network traffic on any active port, network traffic initiated by the server is routed through the first active port.

This type of configuration can lead to a situation where a request is sent to one network interface and is responded to by a different network interface. A response that is received from a different interface than the one that the request was sent to may be disregarded as invalid and prevent proper functionality.

Solution

To avoid this, do one of the following:

• If you need both IP addresses on the same computer, configure one physical interface with two IP addresses as described here.
  
  
• If you need both physical interfaces connected to a network, configure two independent subnets and connect each interface to one subnet.
  
  
• If you are attempting to increase available network bandwidth to the server, see the following links:

  Combining Ethernet ports
  Link Aggregation