Cisco ISE Device Administration – Two Factor Authentication (2FA) with Common Access Card (CAC) using SecureCRT

The network device authenticates you and ISE authorizes you. Just enter your PIN, and you’re in.

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Cisco – Gratuitous ARP: Disabling / Blocking / Ignoring / Spoofing

Send, clear, ignore and spoof ARP. Know how to truly disable the processing of gratuitous ARP in a Cisco router.

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Powershell / Cisco IOS – Generate a list of commands from a csv list of devices

Generates a .doc of commands to paste into devices.  pulls IP and hostname from csv and structures the commands in a way you can copy/pasta.

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DHCP – BAD_ADDRESS entries caused by IP Device Tracking

Microsoft Windows has a feature that detects IP conflicts.  A Cisco switch can effectively turn that feature into a DoS attack on your DHCP server.  That’s pretty neat.

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