1,798
edits
Changes
no edit summary
* '''Gateway IP address''' - The IP address of the NAT device on the virtual network.
* '''UDP Timeout''' -The amount of time, in seconds, to retain UDP mapping within the NAT device. The UDP timeout is essentially the amount of time for which the NAT device remembers which virtual machine initiated a specific UDP based connection to an external system. If the external system responds after the timeout period has elapsed, the NAT will no longer know to which virtual machine the data should be forwarded, and the UDP packet will be discarded. * '''Config port''' - The TCP/IP port used for accessing information about the NAT device. * '''Active FTP''' - Governs whether the NAT device allows Passive or Active FTP sessions. * '''Port Forwarding''' - The ''Port Forwarding'' button allows network traffic arriving on a particular TCP or UDP port on the host system to be forward to a specific port on a specific virtual machine within the NAT based virtual network. Since an external client cannot ordinarily initiate a connection with a virtual machine in NAT based virtual network, port forwarding is useful in situtions where, for example, a virtual machine is required to act as web or FTP server. As illustrated in the following figure, the ''Port Forwarding'' dialog is divided into two sections, one for UDP and the other for TCP. In each case, buttons are provided to Add, Remove and View port forwarding rules: [[Image:vmware_windows_nat_port_forwarding.jpg|Configuring VMware Server NAT port forwarding]] To configure a port forwarding rule, click on one of the two ''Add...'' buttons (depending on whether the forwarding is to apply to UDP or TCP traffic) and enter the ''Host port'' on which arriving traffic is to be forwarded, together with the IP address and port of the destination virtual machine. In addition, an optional description of the port forwarding rule may be entered into the ''Description'' field. Once confighured, any traffic arriving on the specific port of the host system will forwarded to the specified port of the designated virtual machine. * '''DNS''' - When clicked, the '''DNS...''' button allows DNS servers to be configured for use with the NAT device as illustrated in the following figure: [Image:vmware_nat_dns.jpg|Configuring DNS settings for the VMware Server NAT device]] In addition to specifying the IP address of one or more DNS servers, the ''Policy'' for handling multiple DNS servers may also be altered. Options include ''Burst'' where a request is sent simultaneously to three servers and the first response is accepted, ''Order'' where requests are sent one by one to each server and ''Rotate'' where requests are rotated through the available servers. When ''Autodetect'' is selected, VMware Server automatically identifies available name servers without the need for the servers to specifically configured. In addition, the number of retries and length of time the NAT device should attempt to connect to a DNS server may be configured via the ''Timeout'' and ''Retries'' values. * '''Allow any OUI''' - The MAC address of a network device is comprised of 6-bytes of information. The first three bytes are referred to as the Organizationally Unique Identifier (OUI) and uniquely identify the issuer of the MAC address of the device. The last three bytes uniquely identify the device within the context of the OUI. Manually changing the OUI portion of a virtual machine's MAC address can prevent connection to the NAT device. In the event of such a problem, ensure that the ''Allow any OUI'' option is selected. * '''Netbios''' - The ''Netbios'' section of the NAT Settings dialog allows the timeout and retry values for the NetBIOS Name Service (NBNS) and NetBIOS Datagram Service (NBDS) to be specified if these services are being used on the network.
== Configuring NAT on Linux Hosts ==
