Nat And Ftp; Monitoring Nat; Configuration Examples; Static Configuration - Cabletron Systems SmartSwitch Router User's Reference Manual

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.
Specify the FTP session timeout.

Monitoring NAT

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

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
IP network 10.1.1.0/24
10.1.1.2
226
nat set ftp-control-port
nat set ftp-session-timeout
nat show [translations all|
Router
et.2.1 et.2.2
interface 10-net
(10.1.1.1/24)
[timeouts] [statistics]
interface 192-net
(192.50.20.1/24)
SmartSwitch Router User Reference Manual
<port number>
<minutes>
<type>
]
Global Internet