Peter Welcher

In my years of consulting, I’ve run across some interesting IP addressing schemes. “Interesting” as in “yuck” or “hot steaming mess.” You may have too. In fact, you may have [...]

NetCraftsmen is currently working with a customer with some interesting problems. I’d like to share some thoughts and lessons learned. Cheap Is Sometimes Not This first item is arguably obvious, [...]

The blogging part of my brain seems to be stuck on security lately. Apparently because somewhat similar topics keep coming up in discussions with customers or my NetCraftsmen peers. This [...]

I’d like to share a trick I’ve found useful in building a lab to validate configurations. Plus, one other trick that might even be useful in production. The hope is [...]

I recently spent some time researching a moderately sophisticated phishing attempt initiated via physical mail. Heads up: (short version of the gotcha): bad people creating a number (30?) of online [...]

A reader commented on a prior blog, suggesting I write about the title question. I liked the idea, and the resulting words (thoughts) follow. Suggestions for other topics are always [...]

A previous blog, Do You Know Your Flows? discussed figuring out what flows are in your network (network edge, etc.). And the time challenges that can present. It also lightly touched [...]

This blog discusses a problem that several of my NetCraftsmen peers and I are seeing. Once I explain, I’ll leave it up to you: Is this phenomenon real? Is it [...]

This is the eighth in a series of blogs, the DNAC Instant Demo tour. Prior blogs in this series: DNAC Tour Part 1: Introduction to Cisco DNA Center DNAC Tour [...]

This is the seventh in a series of blogs, the DNAC Instant Demo tour. Prior blogs in this series: DNAC Tour Part 1: Introduction to Cisco DNA Center DNAC Tour [...]

This is the sixth in a series of blogs, the DNAC Instant Demo tour. Prior blogs in this series: DNAC Tour Part 1: Introduction to Cisco DNA Center DNAC Tour [...]

This is the fifth in a series of blogs, the DNAC Instant Demo tour. Prior blogs in this series: DNAC Tour Part 1: Introduction to Cisco DNA Center DNAC Tour [...]