Connectivity Guide

Security
This chapter describes several ways to provide security to the Dell EMC Networking system.
For details about all the commands described in this chapter, refer to the Security chapter in the Dell EMC 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 Configuration
• Role-Based Access Control
• Two Factor Authentication (2FA)
• Configuring the System to Drop Certain ICMP Reply Messages
• Dell EMC Networking OS Security Hardening
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 EMC 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 configure AAA accounting by defining a named list of accounting methods
and then applying that list to various virtual terminal line (VTY) lines.
Configuration Task List for AAA Accounting
The following sections present the AAA accounting configuration tasks.
● Enabling AAA Accounting (mandatory)
● Suppressing AAA Accounting for Null Username Sessions (optional)
● Configuring Accounting of EXEC and Privilege-Level Command Usage (optional)
● Configuring AAA Accounting for Terminal Lines (optional)
● Monitoring AAA Accounting (optional)
Enabling AAA Accounting
The aaa accounting command allows you to create a record for any or all of the accounting functions monitored.
To enable AAA accounting, use the following command.
● Enable AAA accounting and create a record for monitoring the accounting function.
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