Làm sao để đổi password Router?

[hqbien]

write va write mem co tac dung nhu nhau. ko tin kiem con router nao ma thu.

nghe chung cai viec doi pass telnet cua ong notme vat va qua. cac huong dan deu dung ca day, neu ko lam dc thi hinh nhu dang tim cach chui vao con router nao do de pha day

[khuckhaihoan]

Trong trường hợp nào đó lỡ ta quên mất password thì phải làm thế nào?:rolleyes:

[CCDesire]

nếu lỡ quên password:
1 - nếu chưa write mem --> restart lại router
2 - nếu đã write mem --> thực hiện các bước password recovery

[satnhan]

Tui de nghi cách như sau, ban thử làm xem nha. http://www.cisco.com/en/US/products/...80094675.shtml
Ban vao trang đó đi, đây là cách bạn config từ cổng consol
chuc thanh cong!

[satnhan]

Sợ ông kô bít cách xem, nên tui copy lun ra đây
Step-by-Step Procedure
To recover your password, complete these steps:

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

For more information on cabling, and details about how to connect a terminal to the console port or the AUX port, visit these links:

Cabling Guide for Console and AUX Ports on Cisco Routers

Connect a Terminal to Catalyst 2948G-L3, 4908G-L3, and 4840G Series Switches

Catalyst 8510CSR, and 8540CSR Switches Console Port Pinouts

If you still have access to the router, type show version , and record the setting of the configuration register. It is usually 0x2102 or 0x102.

For a sample output of the show version command, refer to the Example of Password Recovery Procedure section.

If you do not have access to the router (because of a lost login or TACACS password), you can safely consider that your configuration register is set to 0x2102.

Use the power switch to turn off the router, and then turn it back on.

Important: To simulate step 4 on a Cisco 6400, pull out and then replace the Node Route Processor (NRP) or Node Switch Processor (NSP) card.

Important: To simulate step 4 on a Cisco 6x00 using NI-2, pull out and then replace the NI-2 card.

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

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

Type confreg 0x2142 at the rommon 1> prompt to boot from Flash without loading the configuration.

Type reset at the rommon 2> prompt.

The router reboots but ignores its saved configuration.

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

Type enable at the Router> prompt.

You are taken to the enable mode, and the Router# prompt appears.

Important: Type configure memory or copy startup-config running-config to copy the nonvolatile RAM (NVRAM) into memory.

Do not type configure terminal .

Type write terminal or show running-config .

The show running-config and write terminal commands show the configuration of the router. In this configuration you see under all the interfaces the shutdown command, which means all interfaces are currently shutdown. Also, you can see the passwords (enable password, enable secret, vty, console passwords, and so on) either in encrypted or unencrypted format. The unencrypted passwords can be re-used, the encrypted ones will have to be changed with a new one.

Type configure terminal and make the changes.

The prompt is now hostname(config)#.

Type enable secret <password> to change the enable secret password, for example.

Issue the no shutdown command on every interface that is used.

If you issue a show ip interface brief command, every interface that you want to use should be "up up".

Type config-register 0x2102, or the value you recorded in step 2.

Press Ctrl-Z or end to leave the configuration mode.

The prompt is now changed to hostname#.

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

Example of Password Recovery Procedure
The example in this section presents an actual password recovery procedure. We used a Cisco 2600 to create this example. Even if you do not use a Cisco 2600, this example will be almost exactly what you 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 %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 %LINK-5-CHANGED: Interface BRI0/0,
changed state to administratively down
00:00 %LINK-5-CHANGED: Interface Ethernet0/0,
changed state to administratively down
00:00 %LINK-5-CHANGED: Interface Serial0/0,
changed state to administratively down
00:00 %LINK-5-CHANGED: Interface Ethernet0/1,
changed state to administratively down
00:00 %LINK-5-CHANGED: Interface Serial0/1,
changed state to administratively down
00:00 %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0,
changed state to down
00:00 %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 > [Choose a strong password with at least one capital letter, one number, and one special character.]
Router(config)#^Z
00:01 %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#

[wlansecu]

Lạy hồn
Em đọc cái này mà cười đến chảy cả nước mắt. Có mỗi cái đổi pass mà các bác cứ lằng nhằng mãi, chẳng bác nào hướng dẫn chuẩn tắc cả. CHÁN DÂN CISCO VN QUÁ

Em cũng o hiểu ông cụ nhà mình định làm gì nữa, nếu được quyền quản trị Router mà o biết cách sử lí về pass thì 100% ông bác này đang quậy phá.
Thế nên anh em ngồi nghỉ đi nhé.
Còn về vấn đề quên mật khẩu, để recovery pass, thì bác phải ngồi được bên cạnh con router, tức là phải thực sự là chủ của nó.
Bác có thể coi trực tiếp về các recovery pass trên trang của cisco.
tìm phần thiết bị đó, nó sẽ có tài liệu cụ thể
Với Switch và router có chỗ ngược nhau,
Switch thì giữ nút MODE sau đó mới căm nguồn điện
Router thì tôi nhớ o rõ là dùng nút nào, tùy thiết bị, nhưng mà phải cắm điện rồi mới Ctrl Break thì phải
Huy Bắc
CÒn nếu bác nào chưa tìm được thì đưa lại serial của Router đó, tôi sẽ tìm tài liệu cho

[hvas01]

cuối cùng chỉ còn lại những người ở lại tám với nhau thôi.
reply nhiêu đó mà còn ko hiểu nữa thì... đúng chán bác wlansecu nhỉ

[fox]

sao tôi đổi pass 2620, đánh lệnh login nó lại báo lỗi như dòng bên dưới?
UBQN_R01(config)#line vty 0 4
UBQN_R01(config-line)#login
% Incomplete command.
UBQN_R01(config-line)#

[changchancuucodon]

Để lệnh login có hiệu lực, bạn phải gõ lệnh

password cisco trước

sau đó, mới gõ lệnh

login

[giangcoito]

Nếu telnet vào Router mà mất pass thì không có cách nào xử lý được. Còn nếu có pass cũ mà chỉ sử lại thành pass mới thì quá đơn giản! Trong trường hợp mất pass chỉ còn cách cosole thì mới phá được pass.

Học chăm không bằng đi học!