Tag: troubleshooting

I offer you a handy dandy tool for testing, resetting, validating DSPs on a Cisco voice gateway (tested on ISR models): Hidden Command: test voice driver It will start a [...]

The Cisco Press book Applied Infrastructure blog under

I’m speaking at VoiceCon San Francisco 2008 on the topic of Troubleshooting in Converged Networks.  That’s a fancy title to say that I’ll be talking about VoIP troubleshooting.  There are [...]

I’m doing my presentation titled Troubleshooting Converged VoIP and Data Networks at Interop New York on September 17 at 1:30pm.  The session title is Troubleshooting Converged Networks.  It has been [...]

Paris Traceroute is a new implementations of traceroute available that can infer multiple paths for Unix systems. More information is available at       http://www.paris-traceroute.net/

I’ve done a few seminars on troubleshooting VoIP at VoiceCon (Fall 07 and Spring 08).  Somewhere along the way, someone mentioned a relatively new web site to me: Network Symptoms [...]

One of the NetCraftsmen engineers mentioned a condition where CDP can potentially leak information — this is based on a thread on the c-nsp mailer.   An organization had ‘cdp off’ [...]

There’s a neat story that’s been around the ‘net about a North Carolina University System Administrator who faced a problem where emails from a particular system would only work if [...]

One of our engineers wanted to get debug information about ISAKMP after a system reboot but found it was difficult to login quickly enough after the reboot. He found a [...]

I regularly exchange information with the folks at Chesapeake Netcraftsmen (www.netcraftsmen.net), who often encounter interesting real-world troubleshooting scenarios.  This time it was Rick Burts, who happens to be the top [...]

VoIP troubleshooting is a pretty interesting problem. (See my earlier blog entry regarding my talk at VoiceCon Fall 2007.) There are a large number of tools that look at packets [...]