Administrator’s Handbook
Network Address Translation (NAT) Default Settings
NAT default settings let you specify whether you want your Motorola Netopia® Gateway to forward NAT traf- fic to a default server when it doesn’t know what else to do with it. The NAT default host function is useful in situations where you cannot create a specific NAT pinhole for a traffic stream because you cannot antici- pate what port number an application might use. For example, some network games select arbitrary port numbers when a connection is being opened. By identifying your computer (or another host on your network) as a NAT default server, you can specify that NAT traffic that would otherwise be discarded by the Motorola Netopia® Gateway should be directed to a specific hosts.
set nat-default mode [ off default-server ip-passthrough ]
Specifies whether you want your Motorola Netopia® Gateway to forward unsolicited traffic from the WAN to a default server or an IP passthrough host when it doesn’t know what else to do with it. See “Default Server” on page 89 for more information.
set nat-default dhcp-enable [ on off ]
Allows the IP passthrough host to acquire its IP address via DHCP, if
set
Specifies the IP address of the NAT default server.
set nat-default host-hardware-address MAC_address }
Specifies the hardware (MAC) address of the IP passthrough host. If the MAC address is specified as all- zeroes, the first DHCP client that requests an IP address gets the passthrough address.
Network Address Translation (NAT) Pinhole Settings
NAT pinholes let you pass specific types of network traffic through the NAT interfaces on the Motorola Neto- pia® Gateway. NAT pinholes allow you to route selected types of network traffic, such as FTP requests or HTTP (Web) connections, to a specific host behind the Motorola Netopia® Gateway transparently.
To set up NAT pinholes, you identify the type(s) of traffic you want to redirect by port number, and you spec- ify the internal host to which each specified type of traffic should be directed.
The following list identifies protocol type and port number for common TCP/IP protocols:
•FTP (TCP 21)
•telnet (TCP 23)
•SMTP (TCP 25),
•TFTP (UDP 69)
•SNMP (TCP 161, UDP 161)
set pinhole name name
Specifies the identifier for the entry in the router's pinhole table. You can name pinhole table entries sequentially (1, 2, 3), by port number (21, 80, 23), by protocol, or by some other naming scheme.
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