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How NOT to Connect to Cisco Routers:
There are several ways you can connect a PC to a
Cisco router. You can use the network and telnet to the device. You could connect to
it via modem and the AUX port. By far, the easiest and quickest method is to
just use a console cable with the proper connectors. But what happens if neither
of these methods are available and you don't have the console cable or proper
connectors? Well, that's just what happened one day to Brian Jeffrey and Mark
DeBruyn of WVDEP (West Virginia Department of Environmental
Protection). They used their creativity and came up with a connectivity solution just short of
barbed-wire, duct tape and twine.
Brian told the following story about their problems that
day:
"Mark DeBruyn, who serves as our lead support for the entire northern
region of the state, was taking a Cisco 4000 to our Morgantown field office,
which happens to be on the campus of West Virginia University, for installation.
I had already preconfigured the router, so it should have been just a simple
plug-and-go situation. Since Murphy's Law runs rampant anywhere at any given
time, all did not go as planned. The router was connected properly with known
good cables, but no communication existed between Morgantown and our Nitro
headquarters. After numerous cable customization attempts and a couple of trips
to the local office supply stores, we were still at ground zero. It was late,
and Mark and I were thinking more of having a cold beer than a cold console
connection."
"While we were tossing possible solutions back and forth between each
other, I remembered that I used to test cable pinouts a while back by inserting
an unfolded paperclip into each end of the cable then using an ohmmeter to test
their continuity. I asked Mark if he could find some paperclips laying around
there, straighten them out and use them to insert into the DB25 console port on
the router, which was the connector we were missing. Mark quickly created a
rollover cable, and using a disassembled RJ-45 connector, he connected the
paperclips one at a time as I called out the pin assignments. You have to
understand that Mark is a guy with large hands. For him to take the raw
materials he had available to him and make such an articulate apparatus such as
this without having any of the paperclips touch was an outstanding feat in
itself."
"Needless to say, it worked like a charm and he got into the router on
the first attempt (if any of the paperclips would have touched, there wouldn't
have been any other attempts necessary anyway). The network interface was not
bad, it just needed some configuration changes."
Photos provided by Shawn Keslar, WVDEP
Now the moral of this story is not that it
is ok to go around plugging paperclips into a router interface because you
could do some serious, costly damage if the paperclips touched, hit the wrong pin or if one of
them broke off inside the interface. The moral of the story is that when you are faced
with a no-win situation, sometimes it pays to do a little research and try
alternate methods. Had Brian and Mark not known what the interface
pinouts were, they could have been left with a wasted day and an
unconfigured router. Kudos to you guys for your innovative solution!
- Joel Barrett
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