Operation Manual – LoginH3C S5500-EI Series Ethernet SwitchesChapter 7 Configuring Source IP Address for TelnetService Packets7-1Chapter 7 Configuring Source IP Address forTelnet Service PacketsGo to these sections for information you are interested in:z Overviewz Configuring Source IP Address for Telnet Service Packetsz Displaying the source IP address/Interface Specified for Telnet Packets7.1 OverviewYou can configure source IP address or source interface for Telnet client. This providesa way to manage services and enhances security.The source IP address specified for Telnet service packets is the IP address of anLoopback interface or VLAN interface. After you specify the IP address of a virtualLoopback interface or an unused VLAN interface as the source IP address of Telnetservice packets, the IP address is used as the source IP address no matter whichinterface of the switch is used to transmit packets between the Telnet client and theTelnet 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 canconfigure the Telnet server to accept only Telnet service packets with specific source IPaddresses to make sure specific users can log in to the switch.7.2 Configuring Source IP Address for Telnet ServicePacketsThis feature can be configured in either user view or system view. The configurationperformed in user view takes effect for only the current session, while the configurationperformed in system view takes effect for all the following sessions.I. Configuration in user viewTable 7-1 Configure a source IP address for service packets in user viewTo do… Use the command… RemarksSpecify the source IPaddress or sourceinterface for the switch forit to log in to anotherdevice as a Telnet clienttelnet remote-system[ port-number ] [ source{ ip ip-address | interfaceinterface-typeinterface-number } ]OptionalNot specified by default
