5/5 (2)

Este artículo es para aquellos IT Managers que són un poco “despistados” y no se apuntan bien las contraseñas (recordad siempre en un lugar seguro y encryptado). ¿Quién no se ha encontrado con un router que necesitamos resetear o recuperar pero no encontramos la contraseña o el password?¿Podemos recuperar el password sin perder la configuración?

Pues bien si seguís estos pasos muy sencillos, podréis recuperar la contraseña o password de vuestro router sin necesidad de resetearlo, con lo que significa que vamos a cambiar el password sin borrar toda la configuración. GENIAL!!

TIP: Este método solo funciona con Router de la Serie 8XX, 2600 y 2800 entre otros.

Recuperación password router Cisco

Recuperar Password Router Cisco

Siguiendo estos sencillos pasos vamos a lograr poner un nuevo password o recuperar el viejo que teníamos sin mucho esfuerzo. Solo hay un requisito, estar fisicamente donde está el router.

Material necesario:

  • PC
  • Cable serie (Con adaptador si no disponemos de puerto serie en el PC). Puedes comprar uno de estos si no tienes ninguno:

Procedimiento paso a paso

  1. Conectar el PC con el puerto de “console” del router. Utilitzar estos datos:
      • 9600 baud rate
      • No parity
      • 8 data bits
      • 1 stop bit
      • No flow control

    TIP: Consulta el artículo Conectar PC a router Cisco para saber como hacerlo

  2. Prepara la conexión por el puerto serie con el Putty o Hyperterminal.
  3. Reinicia el router utilizando el interruptor.
  4. Pulsa BREAK en el terminal de consola.
  5. Cuando aparezca en pantalla rommon>1 introduce confreg 0x2142 para reinciar desde la flash. (Este paso se salta la configuración de inicio (start-up configuration) donde estan guardados los passwords).
  6. Introducir el comando RESET cuando aparezca rommon2 > en la pantalla.
  7. El router se reiniciará, pero ignorarà la configuración guardada.
  8. Escribe NO despues de cada pregunta que os salga, o pulsa Ctrl-C para omitir la configuración inicial del router.
  9. Introduce el comando enable cuando aparezca en pantalla Router>. Entrarás en el modo enable y verás al inicio de pantalla Router#.
  10. Escribe configure memory o copy startup-config running-config para copiar la confguración guardada a la configuración que está ejecutándose. IMPORTANTE: No introducir los comandos copy running-config startup-config o write. Estos sobrescribiria la configuración que teníamos en el router.
  11. Pon los siguientes comandos configure terminal. Entonces nos aparecerá en el router hostname(config)#
  12. Escribe enable secret seguido del password. Ejemplo: enable secret cisco. Esto pondrá cisco como nuestro nuevo password.
  13. Introduce el comando config-register 0x2102 para volver a dejar el router con la opción de arranque por defecto.
  14. Pulsa Ctrl-z o end para salir del modo de configuración.
  15. Introduce los comandos write memory o copy running-config startup-config para guardar la configuración y confirmar los cambios.

Ejemplo de recuperación password router Cisco:

A continuación os muestro un ejemplo de recueración de contraseña router Cisco dentro del mismo router.

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

Router>show version
Cisco Internetwork Operating System Software
IOS ™ 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>


!— El router se acaba de reiniciar con el interruptor de power-off y power-on.

!

*** 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 ™ 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 ™ 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 ™ 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 ™ 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#