Configuration MP.11-R Installation and Management
NAT (SU Only; Routing Mode Only)
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NAT (SU Only; Routing Mode Only)
The NAT (Network Address Translation) feature lets hosts on the Ethernet side of the SU transparently access the public
network through the BSU. All hosts in the private network can have simultaneous access to the public network.
NOTE: The SU supports NAPT (Network Address Port Translation) where all private IP addresses are mapped to a
single public IP address, and does not support Basic NAT (where private IP addresses are mapped to a pool of
public IP addresses).
Both dynamic mapping (allowing private hosts to access hosts in the public network) and static mapping (allowing
public hosts to access hosts in the private network) are supported:
• In dynamic mapping, the SU maps the private IP addresses and its transport identifiers to transport identifiers of a
single Public IP address as they originate sessions to the public network. This is used only for outbound access.
• Static mapping is used to provide inbound access. The SU maps a private IP address and its local port to a fixed
public port of the global IP address. This is used to provide inbound access to a local server for hosts in the public
network. Static port mapping allows only one server of a particular type. Up to 1000 ports (500 UDP and 500 TCP) are
supported.
The following parameters are configurable:
NOTE: Changes to NAT parameters, including the NAT Static Port Mapping Table, require a reboot to take effect.
NOTE: When NAT is enabled, the DHCP Relay Agent feature is not supported (DHCP Relay Agent must be disabled
before NAT is enabled) and RIP updates are not sent or received. You can configure a DHCP server to allocate
IP addresses to hosts on the Ethernet side of the SU/ BSU (see DHCP Server).
• NAT Status: Enables or disables the NAT feature. NAT can be enabled only for SUs in Routing mode. The default is
disabled.
• NAT Static Bind Status: Enables or disables the NAT Static Bind status (static mapping) allowing public hosts to
access hosts in a private network. The default is disabled.
• Public IP Address: The NAT Public IP address is the wireless interface IP address.
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