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Configuring NAT Settings

Options on the NAT tab let you determine which virtual network is using the virtual NAT device, stop and start the NAT service, and configure a variety of settings for the NAT device.

You can stop, restart and start the virtual NAT device by clicking the appropriate button. The VMnet host setting lets you choose which virtual network uses the NAT device. You can select Disable if you do not want to use NAT on any virtual network.

You can change any of the following NAT settings when you click Edit:

• You can change the IP address for the NAT device in the Gateway IP address field. If you need to change the netmask, click the < button on the Host Virtual Network Mapping tab of the Virtual Network Editor and choose Subnet.
• You can change the number of minutes to keep the UDP mapping for the NAT in the UDP timeout field.
• In the Config port field, you can specify a port that can be used to access status information about the NAT. This option is used for troubleshooting purposes with VMware technical support only.
• Port forwarding lets you send incoming TCP or UDP requests to a specific virtual machine on the virtual network served by the NAT device. To set up and configure forwarded ports, click Port forwarding. A dialog box appears.

  To add a new port for either TCP or UDP, click Add. If a port is already listed, you can change its settings. Select its name in the list, then click Properties. Or click Remove to remove a selected port.

  When you click Add, another dialog box appears. In the Host port field, type the number of the incoming TCP or UDP port. For example, incoming HTTP requests are usually on port 80. In the Virtual Machine IP address field, type the IP address of the virtual machine to which you want to forward the incoming requests. In the Port field on that line, type the port number you want to use for those requests on that virtual machine. This may be the standard port, such as 80 for HTTP, or a nonstandard port if software running in the virtual machine is configured to accept requests on a nonstandard port. The entry in the Description field is optional. You may use it to identify the service being forwarded, for example, HTTP. When you have made these settings, click OK.

• You may specify the DNS servers to be used by the virtual NAT device. To do so, click DNS. A dialog box appears. You can change the Policy for using multiple DNS servers if you prefer to use Rotate or Burst instead of the default setting of Order.

  In the Timeout field, you can specify a timeout interval in seconds, if the NAT is unable to connect to the DNS server. Use the Retries field to specify the number of times the NAT should retry to connect to the DNS server.

  To add a DNS server to the list, click Add. The Domain Name Server dialog box appears. Enter the DNS server's IP address in the IP address field. The Description field is optional. When you have made the desired settings, click OK. Select Autodetect to have Workstation automatically detect available DNS servers.

  To change the settings for a server already in the list, select its entry in the DNS dialog box, then click Properties. To delete an entry, select the entry, then click Remove. When you have made the desired changes, click OK.

• If you want to allow only passive mode FTP over the NAT device, clear the Active FTP check box.
• If you change the OUI (Organizationally Unique Identifier) portion of the MAC address for the virtual machine and subsequently cannot use NAT with the virtual machine, you should check the Allow Any OUI check box.
• You can change NetBIOS timeout and retry settings.

When you have made all the networking changes you want, click OK.

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