Cabletron Systems SmartSwitch manual NAT and FTP, Monitoring NAT, Static Configuration

Chapter 14: Network Address Translation Configuration Guide

NAT and FTP

File Transfer Protocol (FTP) packets require special handling with NAT, because the FTP PORT command packets contain IP address information within the data portion of the packet. It is therefore important for NAT to know which control port is used for FTP (the default is port 21) and the timeout for the FTP session (the default is 30 minutes). If FTP packets will arrive on a different port number, you need to specify that port to NAT.

To define FTP parameters to NAT, enter the following commands in Configure mode.

Specify the FTP control port.	nat	set	ftp-control-port <port number>
Specify the FTP session timeout.	nat	set	ftp-session-timeout <minutes>

Monitoring NAT

To display NAT information, enter the following command in Enable mode.

Display NAT information.

nat show [translations all<type>] [timeouts] [statistics]

Configuration Examples

This section shows examples of NAT configurations.

Static Configuration

The following example configures a static address binding for inside address 10.1.1.2 to outside address 192.50.20.2:

Outbound: Translate source 10.1.1.2 to 192.50.20.2

Inbound: Translate destination 192.50.20.2 to 10.1.1.2

	Router
IP network 10.1.1.0/24
	et.2.1	et.2.2

interface 10-net

10.1.1.2(10.1.1.1/24)

Global Internet

interface 192-net (192.50.20.1/24)

226 SmartSwitch Router User Reference Manual