Password Recovery

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This study guide is intended to provide those pursuing the CCNA certification with a framework of what concepts need to be studied. This is not a comprehensive document containing all the secrets of the CCNA, nor is it a “braindump” of questions and answers.

I sincerely hope that this document provides some assistance and clarity in your studies.

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Password Recovery

  1. 1. 1
  2. 2. Console Connectivity RJ-45 Connector Console Port Rollover Cable RJ-45 to DB-9 Converter Computer 2
  3. 3. Console Connectivity • Connect a rollover cable to the router console port (RJ-45 connector). • Connect the other end of the rollover cable to the RJ45 to DB-9 converter • Attach the female DB-9 converter to a PC Serial Port. • Open emulation software on the PC. 3
  4. 4. Emulation Software WINDOWS • Start  Programs  Accessories  Communications  HyperTerminal  HyperTerminal. • Give the Connection Name & Select Any Icon • Select Serial (Com) Port where Router is Connected. • In Port Settings  Click on Restore Defaults • Switch on the Router and press Ctrl+Break within 60 seconds to go into Router ROMMON mode. LINUX • # minicom –s • Switch on the Router and press Ctrl+A, Z and F within 60 seconds to go into Router ROMMON mode. 4
  5. 5. Console Connectivity Con 0 E0 LAN - 192.168.1.0/24 5
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  19. 19. System Bootstrap, Version 11.0(10c), SOFTWARE Copyright (c) 1986-1996 by cisco Systems 2500 processor with 2048 Kbytes of main memory > o/r 0x2142 ::ROM Monitor Mode :: ROM Monitor Mode >i If it is Fixed Router If is Fixed Router 00:01:48: %SYS-5-RELOAD:itReload requested > o/r 0x2142 > o/r 0x2142 > ii > If it is Modular Router If it is Modular Router ROMMON> confreg 0x2142 ROMMON> confreg 0x2142 ROMMON> reset ROMMON> reset 19
  20. 20. System Bootstrap, Version 11.0(10c), SOFTWARE Copyright (c) 1986-1996 by cisco Systems 2500 processor with 2048 Kbytes of main memory Notice: NVRAM invalid, possibly due to write erase. F3: 5575260+78596+410108 at 0x3000060 Restricted Rights Legend Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c) of the Commercial Computer Software - Restricted Rights clause at FAR sec. 52.227-19 and subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at DFARS sec. 252.227-7013. Cisco Systems, Inc. 170 West Tasman Drive San Jose, California 95134-1706 20
  21. 21. Cisco Internetwork Operating System Software IOS(tm) 2500 Software(C2500-P-L),Version 12.1(24),RELEASE SOFTWARE(fc1 Copyright (c) 1986-2002 by cisco Systems, Inc. Compiled Mon 30-Sep-02 20:43 by srani Image text-base: 0x0302EA54, data-base: 0x00001000 Cisco 2500(68030)processor(revision N) with 2048K/2048K bytes of memory. Processor board ID 11169613, with hardware revision 00000001 X.25 software, Version 3.0.0. Basic Rate ISDN software, Version 1.1. 1 Ethernet/IEEE 802.3 interface(s) 2 Serial network interface(s) 1 ISDN Basic Rate interface(s) 32K bytes of non-volatile configuration memory. 8192K bytes of processor board System flash (Read ONLY) --- System Configuration Dialog --Would you like to enter the initial configuration dialog? [yes/no]: n 21
  22. 22. Press RETURN to get started! 00:00:20: %LINK-3-UPDOWN: Interface Ethernet0, changed state to up 00:00:20: %LINK-3-UPDOWN: Interface Serial0, changed state to down 00:00:20: %LINK-3-UPDOWN: Interface Serial1, changed state to down 00:00:21: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0, changed state to up 00:00:21: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to down 00:00:21: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed state to down 00:12:43: %LINK-5-CHANGED: Interface Ethernet0, changed state to administratively down 00:12:43: %LINK-5-CHANGED: Interface Serial0, changed state to administratively down 00:12:43: %LINK-5-CHANGED: Interface Serial1, changed state to administratively down 00:12:44: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0, changed state to down 00:12:46: %SYS-5-RESTART: System restarted 22
  23. 23. Cisco Internetwork Operating System Software IOS(tm) 2500 Software(C2500-P-L),Version 12.0(24),RELEASE SOFTWARE(fc1 Copyright (c) 1986-2002 by cisco Systems, Inc. Compiled Mon 30-Sep-02 20:43 by srani Router> enable Router# show running-config Building configuration ..... Current configuration: version 12.1 no service password-encryption no service udp-small-servers no service tcp-small-servers ! hostname Router ! no ip routing ! interface Ethernet0 no ip address --More-- 23
  24. 24. shutdown ! interface Serial0 no ip address shutdown ! interface Serial1 no ip address shutdown ! no ip classless ! line vty 0 line con 0 line aux 0 ! end Router# Router# Router# 24
  25. 25. Hyderabad# show startup-config Building configuration ..... Current configuration: ! version 12.1 no service password-encryption no service udp-small-servers no service tcp-small-servers ! hostname Hyderabad ! enable secret 5 $1$60nw$8XzAJ445GBzx1mgYJTUjo1 enable password cisco ! interface Ethernet0 ip address 192.168.1.150 255.255.255.0 ! interface Serial0 no ip address shutdown --More-- 25
  26. 26. interface Serial1 no ip address shutdown ! no ip classless ! line con 0 login password ccna line aux 0 login password cisco line vty 0 4 login password zoom ! end Hyderabad# Hyderabad# Hyderabad# 26
  27. 27. Router# show version Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-JS-L),Version 12.1(17),RELEASE SOFTWARE Copyright (c) 1986-1999 by cisco Systems, Inc. Compiled Mon 04-Jan-99 17:27 by ashah Image text-base: 0x03040148, data-base: 0x00001000 ROM: System Bootstrap, Version 11.0(10c), SOFTWARE BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOFTWARE (fc1) Hyderabad uptime is 14 minutes System restarted by power-on System image file is "flash:/c2500-ipx-ip.bin", booted via flash Cisco 2500(68030)processor(revision N) with 2048K/2048K bytes of memo Processor board ID 11169613, with hardware revision 00000001 X.25 software, Version 3.0.0. Basic Rate ISDN software, Version 1.1. 1 Ethernet/IEEE 802.3 interface(s) 2 Serial network interface(s) 1 ISDN Basic Rate interface(s) --More-- 27
  28. 28. ROM: System Bootstrap, Version 11.0(10c), SOFTWARE BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOFTWARE (fc1) Hyderabad uptime is 1 hour, 28 minutes System restarted by power-on System image file is "flash:/c2500-ipx-ip.bin", booted via flash Cisco 2500(68030)processor(revision N) with 2048K/2048K bytes of memo Processor board ID 11169613, with hardware revision 00000001 X.25 software, Version 3.0.0. Basic Rate ISDN software, Version 1.1. 1 Ethernet/IEEE 802.3 interface(s) 2 Serial network interface(s) 1 ISDN Basic Rate interface(s) 32K bytes of non-volatile configuration memory. 8192K bytes of processor board System flash (Read ONLY) Configuration register is 0x2142 Router# 28
  29. 29. Router# copy startup-config running-config Building configuration..... [OK] Hyderabad# configure terminal Enter configuration commands, one per line. Hyderabad(config)# interface Ethernet 0 Hyderabad(config-if)# no shut Hyderabad(config-if)# exit Hyderabad(config)# enable secret zoom Hyderabad(config)# config-register 0x2102 Hyderabad(config)# ^Z Hyderabad# write Building configuration..... [OK] Hyderabad# End with CNTL/Z. 29
  30. 30. Hyderabad# show version Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-JS-L),Version 12.1(17),RELEASE SOFTWARE Copyright (c) 1986-1999 by cisco Systems, Inc. Compiled Mon 04-Jan-99 17:27 by ashah Image text-base: 0x03040148, data-base: 0x00001000 ROM: System Bootstrap, Version 11.0(10c), SOFTWARE BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOFTWARE (fc1) Hyderabad uptime is 14 minutes System restarted by power-on System image file is "flash:/c2500-ipx-ip.bin", booted via flash Cisco 2500(68030)processor(revision N) with 2048K/2048K bytes of memo Processor board ID 11169613, with hardware revision 00000001 X.25 software, Version 3.0.0. Basic Rate ISDN software, Version 1.1. 1 Ethernet/IEEE 802.3 interface(s) 2 Serial network interface(s) 1 ISDN Basic Rate interface(s) --More-- 30
  31. 31. ROM: System Bootstrap, Version 11.0(10c), SOFTWARE BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOFTWARE (fc1) Hyderabad uptime is 1 hour, 28 minutes System restarted by power-on System image file is "flash:/c2500-ipx-ip.bin", booted via flash Cisco 2500(68030)processor(revision N) with 2048K/2048K bytes of memo Processor board ID 11169613, with hardware revision 00000001 X.25 software, Version 3.0.0. Basic Rate ISDN software, Version 1.1. 1 Ethernet/IEEE 802.3 interface(s) 2 Serial network interface(s) 1 ISDN Basic Rate interface(s) 32K bytes of non-volatile configuration memory. 8192K bytes of processor board System flash (Read ONLY) Configuration register is 0x2142 (will be 0x2102 at next reload) Hyderabad# reload 31

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