White Papers

To view the status of DNS in the SSH server configuration, use the show running-config ip ssh command from EXEC
mode.
DellEMC#show running-config ip ssh
!
ip ssh server dns enable
ip ssh hostbased-authentication enable
no ip ssh password-authentication enable
ip ssh server enable
Telnet
To use Telnet with SSH, first enable SSH, as previously described.
By default, the Telnet daemon is enabled. If you want to disable the Telnet daemon, use the following command, or disable
Telnet in the startup config. To enable or disable the Telnet daemon, use the [no] ip telnet server enable command.
Example of Using Telnet for Remote Login
DellEMC(conf)#ip telnet server enable
DellEMC(conf)#no ip telnet server enable
VTY Line and Access-Class Configuration
Various methods are available to restrict VTY access in . These depend on which authentication scheme you use — line, local, or
remote.
Table 83. VTY Access
Authentication Method VTY access-class support? Username access-class
support?
Remote authorization
support?
Line YES NO NO
Local NO YES NO
TACACS+ YES NO YES (with version 5.2.1.0 and
later)
RADIUS YES NO YES (with version 6.1.1.0 and
later)
provides several ways to configure access classes for VTY lines, including:
● VTY Line Local Authentication and Authorization
● VTY Line Remote Authentication and Authorization
VTY Line Local Authentication and Authorization
retrieves the access class from the local database.
To use this feature:
1. Create a username.
2. Enter a password.
3. Assign an access class.
4. Enter a privilege level.
You can assign line authentication on a per-VTY basis; it is a simple password authentication, using an access-class as
authorization.
Configure local authentication globally and configure access classes on a per-user basis.
can assign different access classes to different users by username. Until users attempt to log in, does not know if they will be
assigned a VTY line. This means that incoming users always see a login prompt even if you have excluded them from the VTY
Security
689