Switch Firmware v5.00: User IP Lockout

Zyxel_Claudia

Zyxel Networks has added a key security enhancement to its switch firmware with the release of v5.00: User IP Lockout. This feature is designed to protect switch management access from unauthorized login attempts by temporarily blocking IP addresses that repeatedly fail authentication.

What Is User IP Lockout?

User IP Lockout protects switches from brute-force attacks or unauthorized access by:

• Tracking failed login attempts from each IP address.
• Blocking any IP address that exceeds a specified number of failed attempts within a defined time window.
• Automatically lifting the block after a set period.

This feature adds another layer of security for network administrators managing their devices remotely.

How It Works

Here’s an example configuration:

Retry Count: 5 attempts

Attempt Timeout: 3 minutes

Block Time Period: 5 minutes

Example Sequence:

1. A user attempts to log in and fails 5 times within 3 minutes.
2. Their IP address is locked out for 5 minutes.
3. During the block period, login access from that IP is denied.

How to Track User IP Lockout

Navigate to:

• Web GUI > Monitor > System Log

Use the CLI command:

• GS2220# show logins lockout

How to Clearing Blocked IPs

• To release all addresses:
  • Disable and re-enable the User IP Lockout setting in the GUI.
  • Note: You cannot clear a single IP—all IPs are cleared at once.

Comparison: Switch vs. Firewall IP Lockout

Firewalls offer more granular control, the setting of attempt timeout rang is default 1 minute, the switch implementation provides essential protection for typical management scenarios.