5 - 128 WiNG 5.5 Access Point System Reference Guide
11. Define the following Source NAT parameters.
12. Select the Destination tab to view destination NAT configurations and define packets passing through the NAT on the way
back to the LAN are searched against to the records kept by the NAT engine. The destination IP address is changed back to
the specific internal private class IP address to reach the LAN over the network.
Protocol Select the protocol for use with static translation. TCP, UDP and Any are the available
options. Transmission Control Protocol (TCP) is a transport layer protocol used by
applications requiring guaranteed delivery. It’s a sliding window protocol handling both
timeouts and retransmissions. TCP establishes a full duplex virtual connection between
two endpoints. Each endpoint is defined by an IP address and a TCP port number. The User
Datagram Protocol (UDP) offers only a minimal transport service, non-guaranteed
datagram delivery, and provides applications direct access to the datagram service of the
IP layer. UDP is used by applications not requiring the level of service of TCP or are using
communications services (multicast or broadcast delivery) not available from TCP. The
default setting is Any.
Source IP Enter the address used at the (internal) end of the static NAT configuration. This address
(once translated) will not be exposed to the outside world when the translation address is
used to interact with the remote destination.
Source Port Use the spinner control to set the local port number used at the (internal) end of the static
NAT configuration. The default value is port 1.
NAT IP Enter the IP address of the matching packet to the specified value. The IP address modified
can be either source or destination based on the direction specified.
NAT Port Enter the port number of the matching packet to the specified value. This option is valid
only if the direction specified is destination.
Network Select Inside or Outside NAT as the network direction. The default setting is Inside.
Select Inside to create a permanent, one-to-one mapping between an address on an
internal network and a perimeter or external network. To share a Web server on a
perimeter interface with the Internet, use static address translation to map the actual
address to a registered IP address. Static address translation hides the actual address of
the server from users on insecure interfaces. Casual access by unauthorized users
becomes much more difficult. Static NAT requires a dedicated address on the outside
network for each host. Inside NAT is the default setting.
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