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Friday, November 12, 2010

Step by Step Password Recovery on a CISCO 2500 series router

1. Boot the router
2. Interrupt the boot sequence crtl+c
3. type "o" this brings up a menu of configuration register options, e.g
    >o
4. Type "o/r" to change the config register value, e.g
    >o/r 0x2142
5. Reload, type I (for Initialize)
    >I
6. The router reloads and asks if you want to use setup mode, because no startup-config is used.
   Answer no, press ENTER to go into user mode.
7. enable
8. copy start run
9. config t
10. enable secret josh (“josh” will be your new password)
11. config-register 0x2102
12. copy run start
13. reload

For detailed information, i recommend:
http://www.cisco.com/en/US/products/hw/routers/ps233/products_password_recovery09186a0080094795.shtml
http://networking.ringofsaturn.com/Cisco/cisco2500password.php
http://www.streetdirectory.com/travel_guide/149381/networking/_the_configuration_register.html
http://www.2000trainers.com/cisco-ccna-10/ccna-change-configuration-register/
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