Cisco router password cracking method

I. Explanation of the method of crack

1, first use the console line to connect the PC and Router console port, the PC terminal using HyperTerminal.

Router power on, press the "Ctrl+break" key on the keyboard within 60s, interrupt the boot process, enter Rommoritor mode, at this prompt is Rommon 1>

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2, the value of the modified register is 0x2142 (the function of this command is to modify the value of the register, so that the router ignores the NVRAM when booting, does not load the original configuration), this is the 2600 series, if the 2500 series input O/R 0x2142

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3. Restart the router (2500 series input initialize)

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4. After the router restarts, enter the Setup dialog box (enter No, do not start the configuration dialog)

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5, enter the privileged mode, load the original configuration file. Then go to the global mode, modify the privileged mode password to 456, if the console password is also modified together.

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6. Then change the value of the register back, or the next time the router restarts or does not load the configuration. Exit to privileged mode to save the configuration.

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Second, the various Cisco routers into the ROM state of different methods, but generally by the following three ways to enter the ROM state, in the use of the process can be entered separately.

1, if the break is not blocked, you can press the Ctrl+break key to interrupt the boot process and enter the ROM status within 60 seconds of booting.

2, if the break key has been blocked, you can go through the cycle of booting into the ROM state.

Method: After the router is powered on, the power is turned off. After a 5-second interval, it will normally go into ROM state. This method is suitable for routers such as 7500, 12000, and so on.

3, the super-terminal communication baud rate is set to 1200, data bits: 8, Parity bit: 1, stop bit: none. Power on the router, turn it off after booting. After 5 seconds, restart the computer, while holding down the space bar 12 seconds after release, and so on after the router starts, re-change the HyperTerminal bit to the default value. The communication baud rate is set to 9600, data bits: 8, Parity bit: 1, stop bit: none. After reconnecting, you can see that the ROM status has been entered from the terminal. Note that there is no content display on the terminal at baud rate bit 1200. This method is suitable for series routers such as 2500,2600,4500.

This article is from the Linux OPS blog, so be sure to keep this source http://jinghsy.blog.51cto.com/7648537/1638877

Cisco router password cracking method