Configuring network interface cards to simulate a NAT

This optional procedure describes how to you can simulate a Network Address Translator (NAT) to provide additional security by using two Network Interface Cards (NICs), one for an internal IP address facing the Sametime® community server, and the other for an external IP address facing the Internet. This procedure applies to stand-alone Sametime Gateway deployments only. If you use this configuration, you must update the default host using the Integrated Solutions Console.

Before you begin

The procedure applies to single server installations only. If you have a cluster of Sametime Gateway servers, and you want to set up two Network Interface Cards, install the NICs on the proxy server node in the cluster. The proxy server node is smart enough to handle incoming and outgoing addresses on two different IP addresses without additional configuration.

About this task

Perform these steps to configure multiple NIC support in a single server installation. As shown in the illustration, Sametime Gateway may have two IP addresses, one external facing and one internal facing. The internal facing address connects to the Sametime Community Server. The external addresses connects to the external community. Sometimes the Sametime Gateway sends subscribe requests such that the external community is instructed to respond back to the internal IP address. To ensure that Sametime Gateway sends the external IP address instead of the internal IP, perform the following configuration steps:

Two network interface cards

Procedure

  1. Log into Integrated Solutions Console.
  2. Click Servers > Application servers.
  3. Click RTGWServer.
  4. In the "Communications" section, click Ports.
  5. Click SIP_DEFAULTHOST.
  6. In the Host field, type the external IP address; for example: 192.0.2.10
  7. Click SIP_DEFAULTHOST_SECURE.
  8. In the Host field, type the external IP address. For example: 192.0.2.10
  9. Click Apply, then Save.
  10. Restart the Sametime Gateway server.