OSI Model Cheat Sheet
Here is an illustrated cheat sheet for the 7 layers of the OSI Model as used in computer networking. The OSI Model is a conceptual model that…
Networking
How to Stop Traceroute or Ping on a Cisco Device
Did you just start an extended ping or trace from the command line of a Cisco switch or router and are now staring at a…
How to Replace Failed ASA in Active/Standby HA Setup
Looking for the quick and clean way of replacing a failed Cisco ASA in an active/standby HA pair without breaking production traffic? You’re in the…
Enable ICMP Inspection on Cisco ASA – Make Allowing Ping Easier
So you have your shiny new (or new to you) Cisco ASA setup just the way you like it. You’ve allowed only what is needed…
Convert ASA 5516-X back to ASA from FTD
If you received a ASA 5500-X series firewall that is running FTD instead of ASA and you want to roll it back to ASA, (or…
Getting Flexible Netflow v9 on a Cisco 9300 to Export to SolarWinds NTA
I have recently begun a project to replace an aging fleet of Cisco 2911 routers across our WAN with new Cisco Catalyst 9300 switches. One…
Make Your ASA Show Up in a Traceroute – Enable TTL Decrement
If you’ve been blessed, or cursed, with working in an environment with several network segments separated by routers and Cisco ASA firewalls you know that…
Example Ansible Playbook for Updating Cisco IOS Switches
I’m going to assume that if you’re here, you already know what Ansible is. If not, head over to https://www.ansible.com/integrations/networks and check it out. In short…
How to Download Cisco IOS Updates for Free (Legally)
A few years ago Cisco walled off their update downloads, requiring that you have a current SMARTnet subscription (be under a support contract) to download…
8 Best SSH Client & Connection Managers (Hands-On Review)
If you’re like me, you jump in and out of dozens of SSH connections a day. Whether you’re a Linux Server SysAdmin or a Network…
How Update Cisco Router using USB Drive
If you have a Cisco IOS Router or Switch that you need to update via USB, you’re in the right place. Copying your firmware image…
How to Capture Packets Continuously with Wireshark and Dumpcap
Need to know an easy way to capture packets for extended periods of time and save them as small .pcap or .pcapng files? Well you’re…