3Com 4210G Series, Configuration Manual, Page: 855 / 1133

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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, 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.
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
—