Tag Archives: ping

Using Command Line Utilities for Troubleshooting Name Resolution

This content is from our CompTIA Network + Video Certification Training Course. Start training today! Sometimes, Name Resolution fails. We have to be able to troubleshoot why Name Resolution failed. We’re going to see there’s multiple different utilities that we can use. We can troubleshoot using Command‑Line utilities, PowerShell utilities, and then Linux utilities. The … Continue reading Using Command Line Utilities for Troubleshooting Name Resolution

Using Cisco’s EEM for path selection in IPv6 networks

In a previous blog I configured and HSRP pair using an entirely IPv6-oriented topology. I demonstrated the lightning quick failover that can be achieved with carefully crafted timers. However, a careful reader might have noticed that I didn’t consider the path BACK to my source of origin in my topology. So let’s address that today. … Continue reading Using Cisco’s EEM for path selection in IPv6 networks

Windows Troubleshooting Tip – Verifying TCP Connections

I’ve published a number of articles on following a simple and straightforward troubleshooting methodology. I advocate a simple and focused approach shown in Figure 1. You can see that symptom identification is the first step, followed by root cause analysis and problem resolution. Figure 1. MikeDan’s Quick and Dirty Troubleshooting Methodology. There’s lots of great … Continue reading Windows Troubleshooting Tip – Verifying TCP Connections

Troubleshooting DHCP server pools and DHCP clients on Cisco routers

Have you ever encountered a situation where you have configured a Cisco router as your DHCP server, you think you have followed all the steps, and yet the downstream devices don’t seem to be cooperating?  I have built a scenario which I hope will demonstrate some of the pitfalls and gotchas that can interfere with … Continue reading Troubleshooting DHCP server pools and DHCP clients on Cisco routers