Netopia 6.3 - Manual (Page 135)

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Appendix A CONFIG Commands
Network Address Translation (NAT) Default Settings
NAT default settings let you specify whether you want your Cayman Gateway to
forward NAT traffic 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 anticipate what port
number an application might use. For example, some network games select arbi-
trary port numbers when a connection is being opened. By identifying your com-
puter (or another host on your network) as a NAT default server, you can specify
that NAT traffic that would otherwise be discarded by the Cayman Gateway
should be directed to a specific hosts.
.
Specifies whether you want your Cayman Gateway to forward NAT traffic to a
default server when it doesn’t know what else to do with it.
Specifies the IP address of the NAT default server.
Network Address Translation (NAT) Pinhole Settings
NAT pinholes let you pass specific types of network traffic through the NAT inter-
faces on the Cayman 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 Cayman Gateway transparently.
To set up NAT pinholes, you identify the type(s) of traffic you want to redirect by
port number, and you specify 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)
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 proto-
col, or by some other naming scheme.
BOTH set nat-default option { off | on }
BOTH set nat-default address ip-address
BOTH set pinhole name name