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   That sick feeling in your stomach when you know you created a huge mess

I thought I would go ahead and remove the firewall between our core router
and the DSL (Digital Subscriber Line) router [1]. I made as much preparation
as I could before 5:00 pm, the end of the business day.

At about 5:05 pm I swapped some network cables around.

And the Internet broke.

I'm not sure why it didn't work. At first, I thought maybe it was the VLAN
(Virtual Local Area Network) I created on the core router for the DSL router
port (to segregate the network traffic and cut down on broadcasts) and
reverted that.

The DSL circuit was still down, and my phone started ringing.

I then thought that I needed a crossover cable, but I was getting a link
light when using the existing cable.

And the DSL circuit was still down.

The routing changes I had to make looked good, but still, no DSL.

Clearing the ARP (Address Resolution Protocol) tables didn't help [but I just
now realized, in writing this, that I only cleared the ARP table on the core
router, and not on the DSL router—hmmmm].

So I had to revert everything back while trying to keep myself from getting
sick.

Blah.

[1] gopher://gopher.conman.org/0Phlog:2006/04/25.1

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