CCNA R&S (CCNA5.0) Recovery password cisco router

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Phá mật khẩu của Cisco Router

Vào Rommon:

Khi router đang khởi động gõ tổ hợp phím

(Ctrl + Break)

rommon 1 > ?

boot boot up an external process

confreg configuration register utility

dir list files in file system

help monitor builtin command help

reset system reset

set display the monitor variables

tftpdnld tftp image download

unset unset a monitor variable

Đổi giá trị thanh ghi từ 0x2102 thành 0x2142, với mục đích: khi router khởi động sẽ bỏ qua NVRAM

rommon 2 > confreg 0x2142

Khởi động lại router

rommon 3 > boot

System Bootstrap, Version 15.1(4)M4, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Total memory size = 512 MB – On-board = 512 MB, DIMM0 = 0 MB

CISCO2911/K9 platform with 524288 Kbytes of main memory

Main memory is configured to 72/-1(On-board/DIMM0) bit mode with ECC disabled

Readonly ROMMON initialized

program load complete, entry point: 0x80803000, size: 0x1b340

IOS Image Load Test

___________________

Digitally Signed Release Software

program load complete, entry point: 0x81000000, size: 0x3bcd3d8

Self decompressing the image :

########################################################################## [[][[]][[][[]]]OK]

Smart Init is enabled

smart init is sizing iomem

TYPE MEMORY_REQ

Onboard devices &

buffer pools 0x022F6000

–

TOTAL: 0x022F6000

Rounded IOMEM up to: 36Mb.

Using 6 percent iomem. [[][[]][[][[]]]36Mb/512Mb]

Restricted Rights Legend

Use, duplication, or disclosure by the Government is

subject to restrictions as set forth in subparagraph

Rights clause at FAR sec. 52.227-19 and subparagraph

Software clause at DFARS sec. 252.227-7013.

cisco Systems, Inc.

170 West Tasman Drive

San Jose, California 95134-1706

Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.1(4)M5, RELEASE SOFTWARE (fc2)Technical Support: http://www.cisco.com/techsupport

Compiled Wed 18-Jul-07 04:52 by pt_team

Image text-base: 0x2100F918, data-base: 0x24729040

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to

export@cisco.com.

Cisco CISCO2911/K9 (revision 1.0) with 491520K/32768K bytes of memory.

Processor board ID FTX152400KS

3 Gigabit Ethernet interfaces

DRAM configuration is 64 bits wide with parity disabled.

255K bytes of non-volatile configuration memory.

249856K bytes of ATA System CompactFlash 0 (Read/Write)

– System Configuration Dialog –

Continue with configuration dialog? [[][[]][[][[]]]yes/no]:

Press RETURN to get started!

Router khởi động lên, coi như không có file cấu hình.

Tiến hành đổi 3 loại password

Router>

Router>en

Router#conf t

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#ena

Router(config)#enable s

Router(config)#enable secret cisco

Router(config)#li

Router(config)#lin

Router(config)#line con

Router(config)#line console 0

Router(config-line)#pas

Router(config-line)#password cisco

Router(config-line)#login

Router(config-line)#lin

Router(config-line)#exit

Router(config)#li

Router(config)#lin

Router(config)#line vt

Router(config)#line vty 0 4

Router(config-line)#pas

Router(config-line)#password cisco

Router(config-line)#login

Router(config-line)#exit

Router(config)#re

Router(config)#con

Đổi lại giá trị thanh ghi từ 0x2142 thành 0x2102

Router(config)#config-register 0x2102

Router(config)#exit

Router#

%SYS-5-CONFIG_I: Configured from console by console

Nhớ và khởi động lại router

Router#wr

Building configuration…

[[][[]][[][[]]]OK]

Router#reload

Proceed with reload? [[][[]][[][[]]]confirm]