Configuring Source Ip Address For Telnet Service Packets; Overview - 3Com WX3000 Series Operation Manual

6
Configuring Source IP Address for Telnet Service
Packets

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 a 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 switching engine 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 in to the switching engine.

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
Follow these steps to configure a source IP address for service packets in user view:
To do...
Specify a source IP address for
the Telnet client
Specify a source interface for the
Telnet client
Configuration in system view
Follow these steps to configure a source IP address for service packets in system view:
To do...
Specify a source IP address for
Telnet server
Specify a source interface for
Telnet server
Specify source IP address for
Telnet client
Use the command...
telnet remote-server source-ip ip-address
telnet remote-server source-interface
interface-type interface-number
Use the command...
telnet-server source-ip ip-address
telnet-server source-interface
interface-type interface-number
telnet source-ip ip-address
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Remarks
Optional
Optional
Remarks
Optional
Optional
Optional