3Com 4200G 24-Port - Configuring Source IP Address for Telnet Service Packets; Overview

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Configuring Source IP Address for Telnet Service
Packets
Go to these sections for information you are interested in:
z Overview
z Configuring Source IP Address for Telnet Service Packets
z Displaying Source IP Address Configuration
Overview
You can configure source IP address or source interface for the Telnet server and Telnet client. This
provides a way to manage services and enhances security.
The source IP address specified for Telnet service packets is the IP address of an Loopback interface or
VLAN interface. After you specify the IP address of a virtual Loopback interface or an unused VLAN
interface as the source IP address of Telnet service packets, the IP address is used as the source IP
address no matter which interface of the switch is used to transmit packets between the Telnet client
and the Telnet server. This conceals the IP address of the actual interface used. As a result, external
attacks are guarded and the security is improved. On the other hand, you can configure the Telnet
server to accept only Telnet service packets with specific source IP addresses to make sure specific
users can log into the switch.
Configuring Source IP Address for Telnet Service Packets
This feature can be configured in either user view or system view. The configuration performed in user
view takes effect for only the current session, while the configuration performed in system view takes
effect for all the following sessions.
Configuration in user view
Table 8-1 Configure a source IP address for service packets in user view
Operation Command Description
Specify a source IP address for
the Telnet client
telnet remote-server source-ip ip-address
Optional
Specify a source interface for the
Telnet client
telnet remote-server source-interface
interface-type interface-number
Optional
Configuration in system view
Table 8-2 Configure a source IP address for service packets in system view
Operation Command Description
Specify a source IP address for
Telnet server
telnet-server source-ip ip-address
Optional