Digisol DG-GS4826S, Management Manual

Page: 308 / 1344

C
HAPTER
14 | Security Measures
Configuring the Secure Shell
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C
ONFIGURING THE
S
ECURE
S
HELL
The Berkeley-standard includes remote access tools originally designed for
Unix systems. Some of these tools have also been implemented for
Microsoft Windows and other environments. These tools, including
commands such as rlogin (remote login), rsh (remote shell), and rcp
(remote copy), are not secure from hostile attacks.
The Secure Shell (SSH) includes server/client applications intended as a
secure replacement for the older Berkeley remote access tools. SSH can
also provide remote management access to this switch as a secure
replacement for Telnet. When the client contacts the switch via the SSH
protocol, the switch generates a public-key that the client uses along with a
local user name and password for access authentication. SSH also encrypts
all data transfers passing between the switch and SSH-enabled
management station clients, and ensures that data traveling over the
network arrives unaltered.
N
OTE
:
You need to install an SSH client on the management station to
access the switch for management via the SSH protocol.
N
OTE
:
The switch supports both SSH Version 1.5 and 2.0 clients.
C
OMMAND
U
SAGE
The SSH server on this switch supports both password and public key
authentication. If password authentication is specified by the SSH client,
then the password can be authenticated either locally or via a RADIUS or
remote authentication server, as specified on the System
Authentication page ( page 277 ). If public key authentication is specified by
the client, then you must configure authentication keys on both the client
and the switch as described in the following section. Note that regardless of
whether you use public key or password authentication, you still have to
generate authentication keys on the switch (SSH Host Key Settings) and
enable the SSH server (Authentication Settings).
To use the SSH server, complete these steps:
1. Generate a Host Key Pair – On the SSH Host Key Settings page, create
a host public/private key pair.
2. Provide Host Public Key to Clients – Many SSH client programs
automatically import the host public key during the initial connection
setup with the switch. Otherwise, you need to manually create a known
hosts file on the management station and place the host public key in
it. An entry for a public key in the known hosts file would appear similar
to the following example:
10.1.0.54 1024 35
15684995401867669259333946775054617325313674890836547254
15020245593199868544358361651999923329781766065830956
10825913212890233 76546801726272571413428762941301196195566782
59566410486957427888146206519417467729848654686157177393901647