Common operational misconceptions

Mike Andrews mikea at
Fri Feb 17 17:00:50 UTC 2012

On Fri, Feb 17, 2012 at 08:46:02AM -0800, Mike Lyon wrote:
> Sent from my iPhone
> On Feb 17, 2012, at 7:48, Jack Bates <jbates at> wrote:
> >
> >
> > On 2/17/2012 9:18 AM, Steve Clark wrote:
> >> Having worked with many people over the last 40 years, the good trouble
> >> shooters understood how things
> >> were suppose to work. This helps immeasurably in determining where to
> >> start looking.
> >>
> >
> > Ran into this not too long ago with a transport problem. The behavior I was seeing was indicative of the transport not stripping their outer tag. They put wireshark on a windows laptop and sent me the traffic captures. While I didn't know that M$ decided to do something silly like removing a single tag, all indicators were that the M$ stack "fixed" whatever was broken prior to wireshark. We took a capture from another device and proved the problem.
> >
> > Which is a common transport problem I often see, "Our configuration looks right, it must be on your end."
> If i had a dollar for everytime i've heard that from a telco, i'd be a
> rich man...

That and "I'm getting a good ping response here" while I've got the cable
at my end unplugged from the equipment.

Mike Andrews, W5EGO
mikea at
Tired old sysadmin 

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