H3C Technologies H3C S5120 Series Switches - Manual (Page 71)

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Specifying Source for Telnet Packets
When specifying source IP address/interface for Telnet packets, go to these sections for information you
are interested in:
z Introduction
z Specifying Source IP address/Interface for Telnet Packets
z Displaying the source IP address/Interface Specified for Telnet Packets
Introduction
To improve security and make it easier to manage services, you can specify source IP
addresses/interfaces for Telnet clients.
Usually, Loopback interface IP addresses are used as the source IP addresses of Telnet packets. After
you specify the IP address of a Loopback interface as the source IP address of Telnet packets, all the
packets exchanged between the Telnet client and the Telnet server use the IP address as their source
IP addresses, regardless of the ports through which they are transmitted. In such a way, the actual IP
addresses used are concealed. This helps to improve security. Specifying source IP address/interfaces
for Telnet packets also provides a way to successfully connect to servers that only accept packets with
specific source IP addresses.
Specifying Source IP address/Interface for Telnet Packets
The configuration can be performed in user view and system view. The configuration performed in user
view only applies to the current session. Whereas the configuration performed in system view applies to
all the subsequent sessions. Priority in user view is higher than that in system view.
Specifying source IP address/interface for Telnet packets in user view
Follow these steps to specify source IP address/interface for Telnet packets in user view:
To do… Use the command… Remarks
Specify source IP
address/interface for Telnet
packets (the switch operates as
a Telnet client)
telnet remote-system
[ port-number ] [ source { ip
ip-address | interface
interface-type
interface-number } ]
Optional
By default, no source IP
address/interface is specified.
Specifying source IP address/interface for Telnet packets in system view
Follow these steps to specify source IP address/interface for Telnet packets in system view:
To do… Use the command… Remarks
Enter system view system-view —