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September 2, 2017

As a consultant/contractor I usually run into the following scenario where I’m given equipment to configure and it currently has a password. Even though I know the answer, I still ask if they know the password. After several tries of what it should be,...

May 16, 2017

While working with a client on a problem, I suggested we enable SNMP version 2 on some older equipment to get better visibility while we worked on the problem. He immediately said, “No way!! I read that SNMP is insecure and can cause all sorts of issues...

December 14, 2016

Why Packetheads Need Not Fear Cisco ACI

There seems to be much mystique and confusion over Cisco’s ACI and how we as network analysts will troubleshoot in this new network environment. It’s an architecture to which few seem to have completed the move, bu...

July 27, 2016

In this video I take you through a troubleshooting scenario I encountered recently.

This is a great example where you don’t upgrade because you can, but you should upgrade when you have a specific issue that the upgrade will address. But even when you ha...

February 3, 2015

I was working on one of my network cleanup projects when we got into a great discussion about discovery protocols. The specific switch in question that started all this had corporate users and guest users.  They did have separate VLANS and things were w...

January 6, 2015

I was working with a customer after a switch upgrade and we noticed some ports going off and online.

The natural reaction is to ask, “who is that and is it a problem”.

The new switches weren’t added to the management system, so I showed them how to do it...

October 6, 2014

I’ve been showing people the value of a TCP 3 way handshake baseline and its value.

In this specific example, a customer was using FTP to download files to his Cisco equipment and the process was taking too long. After further analysis I mentioned that i...

September 9, 2014

When I conduct my classes on an isolated network, the first thing we need is a DHCP server. 

The other option would be to statically configure an ip address on each device and risk typos and duplicate addresses. DHCP also becomes a huge benefit when work...

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