Common operational misconceptions

Mark Grigsby mark at
Wed Feb 15 21:26:28 UTC 2012

On Wed, Feb 15, 2012 at 1:10 PM, Kenneth M. Chipps Ph.D.
<chipps at>wrote:

> Keep the discussion on the list. I would like to know as well.
> Kenneth M. Chipps Ph.D.
> -----Original Message-----
> From: John Kristoff [mailto:jtk at]
> Sent: Wednesday, February 15, 2012 2:47 PM
> To: nanog at
> Subject: Common operational misconceptions
> Hi friends,
> As some of you may know, I occasionally teach networking to college
> students
> and I frequently encounter misconceptions about some aspect of networking
> that can take a fair amount of effort to correct.
> For instance, a topic that has come up on this list before is how the
> inappropriate use of classful terminology is rampant among students, books
> and often other teachers.  Furthermore, the terminology isn't even always
> used correctly in the original context of classful addressing.
> I have a handful of common misconceptions that I'd put on a top 10 list,
> but
> I'd like to solicit from this community what it considers to be the most
> annoying and common operational misconceptions future operators often come
> at you with.
> I'd prefer replies off-list and can summarize back to the list if there is
> interest.
> John

 I don't know how many times I have "Network Administrators" ask questions
like this...
Speaking in the context of configuring an ipsec tunnel..

    "I have my side built. Can you lock your side down to a specific
protocol? Our sets his device to TCP 104. Makes it nice for me when I set
my ACLs."

I am pretty sure that he meant protocol TCP and Port 104, but I do grind my
teeth when I have to go show them that a specific protocol number means
something completely different than what they were asking.

Mark Grigsby
Network Operations Manager
PCINW (Preferred Connections Inc., NW)
3555 Gateway St. Ste. 205
Springfield, OR  97477
Office  541-242-0808 ext 408
TF:   800-787-3806 ext 408
DID: 541-762-1171
Fax:  541-684-0283

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