Search Results for syslo

How do you learn how to do network design well? NetCraftsmen does Network Assessments, as well as other types of assessments. We frequently get asked about design skills and sources [...]

Over the years, I’ve done my share of troubleshooting. Sometimes it’s quick, sometimes … not. Along the way, I’ve learned to never underestimate my ability to assume something or overlook [...]

Something a bit different came up in troubleshooting the past week, something I’d like to share briefly in case it bites you. Symptom: High CPU on core Nexus 7K in [...]

We’ve been discussing the many things that could be killing your network’s performance – often quietly and without your knowledge. Last time, we covered the value of using the right [...]

What’s eating your network? What is (quietly) killing performance? What performance items should you be watching, but probably are not? I’m a big fan of appropriate network management data, with [...]

I’ve been enjoying working with a fairly large company with some excellent staff, reviewing network and UC management tools, processes, and gaps. All that network management tool immersion has triggered [...]

Edited by Marilyn Outerbridge A very cheap and effective way to perform rudimentary packet-header capturing in IOS is to use the log/log-input keyword at the end of an ACE. This is very easily done. This blog will use the following simple topology for the demonstrations. Basic ACL Logging (Default Settings)…

Ever since I heard that the Nexus 9K has 50% less code, I've been wondering what features were removed from the code. So I did my best to figure it out, since I haven't seen a detailed features list from Cisco yet (early days and all that). I've also noticed…

I get the strangest looks when I talk about POAP and ask people "Why Aren't You Using It?" Admittedly, it doesn't help that I like to pronounce acronyms like words, and POAP comes out sounding like "Pope" or perhaps "Poe-App". Perhaps it will help if I mention that POAP is…

Here is my list of the top ten security mistakes that IT staff makes.  These mistakes leave your network vulnerable to attack and compromise. Mistake #2:  Failure to record flow information. 

I was looking over the NX-OS QoS configuration information, and noted that the documentation states that the permit and deny ACL keywords are ignored for the purposes of matching in QoS class-maps. Really truly? I have found that that using both permit and deny statements in ACLs is a common…

just found out about a great tutorial on designing logging solutions by Marcus Ranum. Marcus has been doing network security work for a long time and is well known in the network security industry. I have previously referenced some of his work in my blog Handling Network Events (syslog and…