Instruction manual

Total Access 850 System Manual Section 4 User Interface Guide
64203376L1-1B © 2004 ADTRAN, Inc. 209
Appendix C. RFC1483 Quick Start (IP Routing with NAT)
To illustrate the use of NAT, consider the example from Appendix B. RFC1483 Quick Start (IP Routing) on
page 204. To add NAT to the IP routing example, use the
NAT menus.
For more details on the configuration parameters discussed in this section, refer to the following pages:
Router Network Interface Configuration menus beginning on page 148
IP Routing with NAT
Step Action
1
The NAT menu is found under ROUTER >CONFIGURATION > INTERFACES >
S
ETUP > NAT. The NAT menu can easily be accessed by pressing
<CTRL+N>.
The network interface will not appear if a virtual circuit is not defined using
the
L2 PROTOCOL menus.
2
From the NAT menu, set PORT TRANSLATION to ENABLED. (This will enable
translation and populate the corresponding NAT menu options.)
3
Set PUBLIC IP ADDRESS MODE to either INTERFACE or SPECIFIED.
• INTERFACE (default) configures NAT to use the IP address already
assigned to the interface. (In other words, the interface address and the
NAPT address are the same.)
• SPECIFIED allows you to define a different IP address for the NAPT
address (public address for private addresses to be translated into).
For basic NAT, this is all of the configuration that needs to be done. For
specific port translations or 1:1 mapping, you can enter T
RANSLATION TABLE.
4
From the TRANSLATION TABLE menu, create a new entry by using the right
arrow to enter the table. Additional entries can be created by highlighting the
first entry index number and pressing the <I> key. Entries can be deleted by
highlighting the selected entry index number and pressing the <D> key.
5
Create specific NAT translations based on your application.
PUBLIC IP ADDRESS MODE Use the configured interface IP address as the NAPT
address or use
SPECIFIED to set a different public
address to be used for the translation.
PROTOCOL MODE Protocol for this translation. (TCP, UCP, ICMP, TCP or
UDP, TCP UDP or ICMP, All, Specified, and NONE.)
PRIVATE ADDRESS MODE SPECIFIED or ANY INTERNAL. Choosing SPECIFIED
brings up the PRIVATE ADDRESS option.
TRANSLATE BODY YES or NO. If set to YES, this will translate the body of
the data packet and replace the private address with
the NAPT address. Default is
NO, which is used for
most applications.