H3C S7500E Series Ethernet Switches Operation Manual

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H3C S7500E Series Ethernet Switches Chapter 6 Specifying Source for Telnet Packets
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Chapter 6 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
6.1 Introduction
To improve security and make it easier to manage services, you can specify source IP
addresses/interfaces for Telnet clients.
Usually, VLAN interface IP addresses and Loopback interface IP addresses are used
as the source IP addresses of Telnet packets. After you specify the IP address of a
VLAN interface or 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.
6.2 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.
I. 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.