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  • Recovery Password Cisco 2600

    Recovery Password Cisco 2600


    Here you can see how to use command cisco confreg 0x2142. This document describes how to recover the enable password and the enable secret passwords. These passwords protect access to privileged EXEC and configuration modes. The enable password password can be recovered, but the enable secret password is encrypted and must be replaced with a new password. Use the procedure described in this document in order to replace the enable secret password.

    Prerequisites Requirements
    There are no specific requirements for this document.
    Components Used The information in this document is based on these hardware versions:
    * Cisco 2600 Series Router
    * Cisco 2800 Series Router
    The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared default) configuration. If your network is live, make sure that you understand the potential impact of any command.
    Related Products
    Refer to Password Recovery Procedures for information on how to recover passwords for related products.

    Conventions
    Refer to Cisco Technical Tips Conventions for information on document conventions.
    Step-by-Step Procedure

    Follow these steps in order to recover your password:
    1.Attach a terminal or PC with terminal emulation to the console port of the router.
    Use these terminal settings:
    * 9600 baud rate
    * No parity
    * 8 data bits
    * 1 stop bit
    * No flow control

    Refer to these documents for information on how to cable and connect a terminal to the console port or the AUX port:
    * Cabling Guide for Console and AUX Ports
    * Connecting a Terminal to the Console Port on Catalyst Switches
    *Connect a Terminal to Catalyst 2948G-L3, 4908G-L3, and 4840G Series Switches
    2. If you can access the router, type show version at the prompt, and record the configuration register setting. See Example of Password Recovery Procedure in order to view the output of a show version command

    Note: The configuration register is usually set to 0x2102 or 0x102. If you can no longer access the router (because of a lost login or TACACS password), you can safely assume that your configuration register is set to 0x2102.
    3. Use the power switch in order to turn off the router, and then turn the router back on.

    Important Notes:
    * In order to simulate this step on a Cisco 6400, pull out and then plug in the Node Route Processor (NRP) or Node Switch Processor (NSP) card.
    * In order to simulate this step on a Cisco 6x00 with NI-2, pull out and then plug in the NI-2 card.

    4. Press Break on the terminal keyboard within 60 seconds of power up in order to put the router into ROMMON.

    If the break sequence does not work, refer to Standard Break Key Sequence Combinations During Password Recovery for other key combinations.

    5. Type confreg 0x2142 at the rommon 1> prompt in order to boot from Flash.
    This step bypasses the startup configuration where the passwords are stored.

    6. Type reset at the rommon 2> prompt.
    The router reboots, but ignores the saved configuration.

    7. Type no after each setup question, or press Ctrl-C in order to skip the initial setup procedure.

    8. Type enable at the Router> prompt.
    You are in enable mode and should see the Router# prompt.

    9. Type configure memory or copy startup-config running-config in order to copy the nonvolatile RAM (NVRAM) into memory.
    Important: Do not type copy running-config startup-config or write. These commands erase your startup configuration.

    10. Type show running-config.
    The show running-config command shows the configuration of the router. In this configuration, the shutdown command appears under all interfaces, which indicates all interfaces are currently shut down. In addition, the passwords (enable password, enable secret, vty, console passwords) are in either an encrypted or unencrypted format. You can reuse unencrypted passwords. You must change encrypted passwords to a new password.

    11. Type configure terminal.
    The hostname(config)# prompt appears.

    12. Type enable secret in order to change the enable secret password. For example:
    hostname(config)#enable secret cisco

    13. Issue the no shutdown command on every interface that you use.
    If you issue a show ip interface brief command, every interface that you want to use should display up up.

    14. Type config-register . Where configuration_register_setting is either the value you recorded in step 2 or 0x2102 . For example:
    hostname(config)#config-register 0x2102

    15. Press Ctrl-z or end in order to leave the configuration mode.
    The hostname# prompt appears.

    16. Type write memory or copy running-config startup-config in order to commit the changes.

    Example of Password Recovery Procedure

    This section provides an example of the password recovery procedure. This example was created with a Cisco 2600 Series Router. Even if you do not use a Cisco 2600 Series Router, this output provides an example of what you should experience on your product.

    Router>enable
    Password:
    Password:
    Password:
    % Bad secrets

    Router>show version
    Cisco Internetwork Operating System Software
    IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)
    Copyright (c) 1986-1999 by cisco Systems, Inc.
    Compiled Tue 07-Dec-99 02:21 by phanguye
    Image text-base: 0x80008088, data-base: 0x80C524F8

    ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)

    Router uptime is 3 minutes
    System returned to ROM by abort at PC 0x802D0B60
    System image file is "flash:c2600-is-mz.120-7.T"

    cisco 2611 (MPC860) processor (revision 0x202) with 26624K/6144K bytes of memory.
    Processor board ID JAB031202NK (3878188963)
    M860 processor: part number 0, mask 49
    Bridging software.
    X.25 software, Version 3.0.0.
    Basic Rate ISDN software, Version 1.1.
    2 Ethernet/IEEE 802.3 interface(s)
    2 Serial(sync/async) network interface(s)
    1 ISDN Basic Rate interface(s)
    32K bytes of non-volatile configuration memory.
    8192K bytes of processor board System flash partition 1 (Read/Write)
    8192K bytes of processor board System flash partition 2 (Read/Write)

    Configuration register is 0x2102
    Router>
    !--- The router was just powercycled, and during bootup a
    !--- break sequence was sent to the router.
    !
    *** System received an abort due to Break Key ***

    signal= 0x3, code= 0x500, context= 0x813ac158
    PC = 0x802d0b60, Vector = 0x500, SP = 0x80006030
    rommon 1 > confreg 0x2142

    You must reset or power cycle for new config to take effect

    rommon 2 > reset

    System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
    Copyright (c) 1999 by cisco Systems, Inc.
    TAC:Home:SW:IOS:Specials for info
    C2600 platform with 32768 Kbytes of main memory

    program load complete, entry point: 0x80008000, size: 0x6fdb4c

    Self decompressing the image : ###############################
    ##############################################################
    ##############################################################
    ##############################################################
    ############################### [OK]


    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

    Cisco Internetwork Operating System Software
    IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)
    Copyright (c) 1986-1999 by cisco Systems, Inc.
    Compiled Tue 07-Dec-99 02:21 by phanguye
    Image text-base: 0x80008088, data-base: 0x80C524F8

    cisco 2611 (MPC860) processor (revision 0x202) with 26624K/6144K bytes of memory.
    Processor board ID JAB031202NK (3878188963)
    M860 processor: part number 0, mask 49
    Bridging software.
    X.25 software, Version 3.0.0.
    Basic Rate ISDN software, Version 1.1.
    2 Ethernet/IEEE 802.3 interface(s)
    2 Serial(sync/async) network interface(s)
    1 ISDN Basic Rate interface(s)
    32K bytes of non-volatile configuration memory.
    8192K bytes of processor board System flash partition 1 (Read/Write)
    8192K bytes of processor board System flash partition 2 (Read/Write)

    --- System Configuration Dialog ---

    Would you like to enter the initial configuration dialog? [yes/no]: n

    Press RETURN to get started!

    00:00:19: %LINK-3-UPDOWN: Interface BRI0/0, changed state to up
    00:00:19: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up
    00:00:19: %LINK-3-UPDOWN: Interface Ethernet0/1, changed state to up
    00:00:19: %LINK-3-UPDOWN: Interface Serial0/0, changed state to down
    00:00:19: %LINK-3-UPDOWN: Interface Serial0/1, changed state to down
    00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0/0,
    changed state to down
    00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0,
    changed state to up
    Router>
    00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1,
    changed state to up
    00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0,
    changed state to down
    00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1,
    changed state to down
    00:00:50: %SYS-5-RESTART: System restarted --
    Cisco Internetwork Operating System Software
    IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)
    Copyright (c) 1986-1999 by cisco Systems, Inc.
    Compiled Tue 07-Dec-99 02:21 by phanguye
    00:00:50: %LINK-5-CHANGED: Interface BRI0/0,
    changed state to administratively down
    00:00:52: %LINK-5-CHANGED: Interface Ethernet0/0,
    changed state to administratively down
    00:00:52: %LINK-5-CHANGED: Interface Serial0/0,
    changed state to administratively down
    00:00:52: %LINK-5-CHANGED: Interface Ethernet0/1,
    changed state to administratively down
    00:00:52: %LINK-5-CHANGED: Interface Serial0/1,
    changed state to administratively down
    00:00:53: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0,
    changed state to down
    00:00:53: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1,
    changed state to down
    Router>
    Router>enable
    Router#copy startup-config running-config
    Destination filename [running-config]?
    1324 bytes copied in 2.35 secs (662 bytes/sec)
    Router#
    00:01:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0/0:1,
    changed state to down
    00:01:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0/0:2,
    changed state to down
    Router#configure terminal
    Enter configuration commands, one per line. End with CNTL/Z.
    Router(config)#enable secret < password >
    Router(config)#^Z
    00:01:54: %SYS-5-CONFIG_I: Configured from console by console
    Router#show ip interface brief

    Interface IP-Address OK? Method Status Protocol
    Ethernet0/0 10.200.40.37 YES TFTP administratively down down
    Serial0/0 unassigned YES TFTP administratively down down
    BRI0/0 193.251.121.157 YES unset administratively down down
    BRI0/0:1 unassigned YES unset administratively down down
    BRI0/0:2 unassigned YES unset administratively down down
    Ethernet0/1 unassigned YES TFTP administratively down down
    Serial0/1 unassigned YES TFTP administratively down down
    Loopback0 193.251.121.157 YES TFTP up up
    Router#configure terminal
    Enter configuration commands, one per line. End with CNTL/Z.
    Router(config)#interface Ethernet0/0
    Router(config-if)#no shutdown
    Router(config-if)#
    00:02:14: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up
    00:02:15: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0,
    changed state to up
    Router(config-if)#interface BRI0/0
    Router(config-if)#no shutdown
    Router(config-if)#
    00:02:26: %LINK-3-UPDOWN: Interface BRI0/0:1, changed state to down
    00:02:26: %LINK-3-UPDOWN: Interface BRI0/0:2, changed state to down
    00:02:26: %LINK-3-UPDOWN: Interface BRI0/0, changed state to up
    00:02:115964116991: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0,
    TEI 68 changed to up
    Router(config-if)#^Z
    Router#
    00:02:35: %SYS-5-CONFIG_I: Configured from console by console
    Router#copy running-config startup-config
    Destination filename [startup-config]?
    Building configuration...
    [OK]
    Router#show version
    Cisco Internetwork Operating System Software
    IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)
    Copyright (c) 1986-1999 by cisco Systems, Inc.
    Compiled Tue 07-Dec-99 02:21 by phanguye
    Image text-base: 0x80008088, data-base: 0x80C524F8

    ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)

    Router uptime is 3 minutes
    System returned to ROM by abort at PC 0x802D0B60
    System image file is "flash:c2600-is-mz.120-7.T"

    cisco 2611 (MPC860) processor (revision 0x202)
    with 26624K/6144K bytes of memory.
    Processor board ID JAB031202NK (3878188963)
    M860 processor: part number 0, mask 49
    Bridging software.
    X.25 software, Version 3.0.0.
    Basic Rate ISDN software, Version 1.1.
    2 Ethernet/IEEE 802.3 interface(s)
    2 Serial(sync/async) network interface(s)
    1 ISDN Basic Rate interface(s)
    32K bytes of non-volatile configuration memory.
    8192K bytes of processor board System flash partition 1 (Read/Write)
    8192K bytes of processor board System flash partition 2 (Read/Write)

    Configuration register is 0x2142

    Router#configure terminal
    Enter configuration commands, one per line. End with CNTL/Z.
    Router(config)#config-register 0x2102
    Router(config)#^Z
    00:03:20: %SYS-5-CONFIG_I: Configured from console by console

    Router#show version
    Cisco Internetwork Operating System Software
    IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)
    Copyright (c) 1986-1999 by cisco Systems, Inc.
    Compiled Tue 07-Dec-99 02:21 by phanguye
    Image text-base: 0x80008088, data-base: 0x80C524F8

    ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)

    Router uptime is 3 minutes
    System returned to ROM by abort at PC 0x802D0B60
    System image file is "flash:c2600-is-mz.120-7.T"

    cisco 2611 (MPC860) processor (revision 0x202)
    with 26624K/6144K bytes of memory.
    Processor board ID JAB031202NK (3878188963)
    M860 processor: part number 0, mask 49
    Bridging software.
    X.25 software, Version 3.0.0.
    Basic Rate ISDN software, Version 1.1.

    2 Ethernet/IEEE 802.3 interface(s)
    2 Serial(sync/async) network interface(s)
    1 ISDN Basic Rate interface(s)
    32K bytes of non-volatile configuration memory.
    8192K bytes of processor board System flash partition 1 (Read/Write)
    8192K bytes of processor board System flash partition 2 (Read/Write)

    Configuration register is 0x2142 (will be 0x2102 at next reload)

    Router#


    !!!!!!!!!!!!!!!!! FINISH !!!!!!!!!!!!

5 komentar:

  1. Cisco 2600 is a very effective software for password recovery and enable the secret passwords.I think it's the best in today's upcoming..

  1. tambelan says:

    yeah sure. till now we still use it at all.

  1. dremb says:

    Great information. thanks for your post it useful for me.

  1. nice info............... :)

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