Tag: troubleshooting

An organization named Able once acquired a small organization called Baker. While reviewing Baker’s network, I found pervasive and overlapping configuration issues. I thought I’d briefly describe the issues here. [...]

I recently listened to the October 10, 2010 Packet Pusher Podcast where Terry Slattery was a featured speaker. This podcast focused on network management and configuration management. Terry outlined some common network problems he has seen in supporting customer networks. Terry and other speakers Greg Ferro and Josh O'Brien discussed…

I recently read a blog by Joel Spolsky titled Applied Infrastructure blog under

I was at VoiceCon two weeks ago, participating in a panel where I talked about network resiliency and presented my VoIP Troubleshooting and Monitoring tutorial.  Both presentations included examples of [...]

The Cisco AnyConnect VPN client is Cisco’s SSL VPN client offering.  Cisco currently supports this VPN client and the legacy IPSec VPN client, called the Cisco VPN Client.  The Cisco VPN client will be phased out over time.  This can be seen by the Cisco VPN Client FAQ explaining that…

Buffer tuning has long been an interesting topic for me.  I recently found a blog post by Brough Turner, who wrote an interesting article about a potential misconfiguration of AT&T [...]

We recently had an interface wedge on a customer router, with some interesting repercussions.  The network topology is shown below. Every day from about 8am until 6pm, a 250Mbps – [...]

Here is a recap of articles I posted in August to my blog at Netcordia: “Quick Network Redundancy Test” describes why and how you should test the network redundancy that [...]

Have you ever used the OSI model to aid your troubleshooting?  I’ve been able to use it to help me isolate the causes of problems and focus my troubleshooting to [...]

NetCraftsmen provides a UC Optimization service where we will perform, among other things, a general health check on an existing cluster.  Some times this is done as part of a routine optimization task.  As of late, we perform this task as part of upgrade preparations. Anyone who has run CallManager…

Here is a recap of articles I posted in April to my blog at Netcordia: “Network SLA Methodologies“ discusses the the types of data needed for SLA calculations. It also [...]

I attended VoiceCon Orlando 2009 this week and had the privilege of participating in three events: Teaching a half-day tutorial on “VoIP Troubleshooting, Monitoring, and Metrics” in which I covered [...]