Password Recovery on Cisco 1700 and 1800 Routers

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Sometimes you’re going to come across a router you need to work on where someone’s changed the password and forgotten to write it down, and sometimes that person may or may not be you. Regardless of the reason, how to you get in to a router which you’re locked out of?

You’ll need a few bits of kit to get you started. First, a 1700 or 1800 router (obviously) which is unusable. Second, you’ll need a Cisco console cable (light blue with an RJ-45 on one end and a DB9 serial connector on the other). Finally you’ll need a computer with a serial port and a VT100 program of some description. Hyperterm will do in a pinch, but something like Zoc or PuTTY is my preference. Continue reading

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