Reference Guide

If the IP address in the RSA key does not match the IP address from which you attempt to log in, the following message
appears. In this case, verify that the name and IP address of the client is contained in the file /etc/ hosts: RSA
Authentication Error.
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
FTOS(conf)#ip telnet server enable
FTOS(conf)#no ip telnet server enable
VTY Line and Access-Class Configuration
Various methods are available to restrict VTY access in FTOS. These depend on which authentication scheme you use
— line, local, or remote.
Table 42. 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 FTOS version
5.2.1.0 and later)
RADIUS YES NO YES (with FTOS version
6.1.1.0 and later)
FTOS 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
FTOS 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.
FTOS can assign different access classes to different users by username. Until users attempt to log in, FTOS 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
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