Administrator Guide

Security

This chapter describes several ways to provide security to the Dell Networking system.

For details about all the commands described in this chapter, refer to the Security chapter in the Dell Networking OS Command Reference

Guide.

Topics:

• AAA Accounting

• AAA Authentication

• Obscuring Passwords and Keys

• AAA Authorization

• RADIUS

• TACACS+

• Protection from TCP Tiny and Overlapping Fragment Attacks

• Enabling SCP and SSH

• Telnet

• VTY Line and Access-Class Conguration

• Role-Based Access Control

• Two Factor Authentication (2FA)

• Conguring the System to Drop Certain ICMP Reply Messages

AAA Accounting

Accounting, authentication, and authorization (AAA) accounting is part of the AAA security model.

For details about commands related to AAA security, refer to the Security chapter in the Dell Networking OS Command Reference Guide.

AAA accounting enables tracking of services that users are accessing and the amount of network resources being consumed by those

services. When you enable AAA accounting, the network server reports user activity to the security server in the form of accounting

records. Each accounting record comprises accounting attribute/value (AV) pairs and is stored on the access control server.

As with authentication and authorization, you must congure AAA accounting by dening a named list of accounting methods and then

applying that list to various virtual terminal line (VTY) lines.

Conguration Task List for AAA Accounting

The following sections present the AAA accounting conguration tasks.

• Enabling AAA Accounting (mandatory)

• Suppressing AAA Accounting for Null Username Sessions (optional)

• Conguring Accounting of EXEC and Privilege-Level Command Usage (optional)

• Conguring AAA Accounting for Terminal Lines (optional)

• Monitoring AAA Accounting (optional)

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