Specifications

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Cisco Wide Area Application Services Command Reference
OL-11817-01
Chapter 3 CLI Commands
(config) sshd
Usage Guidelines SSH enables login access to the WAAS device through a secure and encrypted channel. SSH consists of
a server and a client program. Like Telnet, you can use the client program to remotely log on to a machine
that is running the SSH server, but unlike Telnet, messages transported between the client and the server
are encrypted. The functionality of SSH includes user authentication, message encryption, and message
authentication.
Before you enable the sshd command, use the ssh-key-generate command to generate a private and a
public host key, which the client programs use to verify the server’s identity.
Although the sshd password-guesses command specifies the number of allowable password guesses
from the SSH server side, the actual number of password guesses for an SSH login session is determined
by the combined number of allowable password guesses of the SSH server and the SSH client. Some
SSH clients limit the maximum number of allowable password guesses to three (or to one in some cases),
even though SSH server side allows more than this number of guesses.
When sshd password-guesses is entered, specifying n allowable password guesses, certain SSH clients
interpret this number as n+1. For example, when configuring the number of guesses to two by issuing
the command sshd password-guesses 2 for a particular device, SSH sessions from some SSH clients
will allow three password guesses.
You can enable both SSH Version 1 and Version 2, or you can enable one version and not the other. When
you enable the SSH daemon using the sshd enable global configuration command, support for both SSH
Version 1 and SSH Version 2 is enabled. If you want the WAAS device to support only one version of
SSH (for example SSH version 2), you must disable the other version. For example, to disable SSH
Version 1, enter the no sshd version 1 command.
If the SSH daemon is currently enabled on a WAAS device, at least one version of SSH must be enabled
on the device. Before you can disable both versions of SSH, you must enter the no sshd enable command
to disable the SSH daemon on the WAAS device. If you attempt to disable both versions of SSH before
you have disabled the SSH daemon, the following message will appear on your console informing you
that you must disable the SSH daemon before you can disable both versions of SSH:
WAE(config)# no sshd version 1
WAE(config)# no sshd version 2
Atleast SSHv1 or SSHv2 must be enabled with sshd enabled.
Disable sshd to disable both SSHv1 and SSHv2.
Did not update ssh version support. Please retry.
When support for both SSH version 1 and SSH version 2 are enabled in the WAAS device, the show
running-config EXEC command output does not display any SSHD configuration.
If you have disabled the support for one version of SSH, the show running-config EXEC command
output contains the following line:
no sshd version version_number
Note The Telnet daemon can still be used with the WAAS device. SSH does not replace Telnet.