9 Telnet and SSH
Quidway NetEngine80
Configuration Guide - Basic Configurations
9-4
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 04 (2009-12-20)
If the network disconnects, the shortcut keys become invalid. The instruction cannot be sent to the
server.
Ctrl
_
K: The client interrupts the connection.
When the server fails and the client is unaware of the failure, the server does not respond to
the input of the client. In this case, if you press
Ctrl
+
K
, the Telnet client interrupts the
connection actively and quits the Telnet connection.
For example:
<RouterC> (Press <Ctrl_K> to directly interrupt the connection and quit Telnet
connection.
<RouterA>
When the number of remote login users reaches to the maximum number of VTY user
interfaces, the system prompts that all user interfaces are in use and you cannot use Telnet to
log in.
9.1.3 SSH Terminal Services
Overview of SSH
When users on an insecure network log in to the router through Telnet, the Secure Shell (SSH)
feature offers security guarantee and powerful authentication. It protects the router from
attacks such as IP address spoofing and interception of plain text password.
The router can be connected with multiple SSH users.
The SSH client function allow users to establish SSH connections with a router that supports
SSH server or a UNIX host. As shown in
Figure 9-4
and
Figure 9-5
, an SSH channel is set up
for the local connection and the Wide Area Network (WAN) connection.
