Cisco password recover

一：先準備一條使用RJ45接頭的連接線，連接Router的Console Port。

二：終端機使用以下設定(不要用Win NT，建議用WinXP.2000.2003)
9600 baud rate
No parity
8 data bits
1 stop bit
No flow control

三：將Router開機，
System Bootstrap, Version 11.3(19)AA, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
Copyright (c) 1998 by cisco Systems, Inc.
C2600 processor with 32768 Kbytes of main memory
Main memory is configured to 32 bit mode with parity enabled
看到出現此訊息後，趕緊按下Ctrl+Break送出 Break，就會進到ROMMON Mode。

四：在rommon>下輸入confreg
rommon 1 > confreg
回答下列問題
Configuration Summary
enabled are:
load rom after netboot fails
console baud: 9600
boot: image specified by the boot system commands
or default to: cisco2-C2600

do you wish to change the configuration? y/n [n]: y-------回答Y
enable "diagnostic mode"? y/n [n]:
enable "use net in IP bcast address"? y/n [n]:
disable "load rom after netboot fails"? y/n [n]:
enable "use all zero broadcast"? y/n [n]:
enable "break/abort has effect"? y/n [n]:
enable "ignore system config info"? y/n [n]: y-------回答Y
change console baud rate? y/n [n]:
change the boot characteristics? y/n [n]: y-------回答Y

enter to boot:
0 = ROM Monitor
1 = the boot helper image
2-15 = boot system
[2]: 2-----要選2

五：rommon 2 > reset 重新啟動 Router
六：--- System Configuration Dialog --- Router 會自動進入 Setup 選單
Would you like to enter the initial configuration dialog? [yes/no]:
按 Ctrl-C 中斷 Setup

七：Router 會進入一般模式
Router>enable 進入 Priviledged mode (不需輸入任何密碼)
Router#show startup-config 顯示 NVRAM 裡面的 Startup-Config
(顯示結果省略)

八：將 Startup-Config 載入 DRAM
Router#configure memory

九： 2611#configure terminal----輸入此命令進入設定模式

十：將 enable 的密碼改為 [自訂]
2611(config)#enable secret [自訂]
十一：將 Running-Config 寫回 NVRAM
2611#copy running-config startup-config

十二：
2611#show version
Cisco Internetwork Operating System Software
(中間結果省略)
Configuration register is 0x2142 目前的 Configuration Register 為 0x2142

十三：
2611#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
2611(config)#config-reg 0x2102 將 Configuration Register 改回來
2611(config)#^Z -----Ctrl+Z
2611#
00:01:54: %SYS-5-CONFIG_I: Configured from console by console
2611# reload 重新開機

PS:參考網頁(Cisco)