Recovery della password su Cisco serie 2500

1. All'accensione, inviare la sequenza di break da terminale (pausa o interr. o break da tastiera) per arrestare il boot:

System Bootstrap, Version 11.0(10c), SOFTWARE
Copyright (c) 1986-1996 by cisco Systems
2500 processor with 2048 Kbytes of main memory

Abort at 0x1098FF2 (PC)
>?
$ Toggle cache state
B [filename] [TFTP Server IP address | TFTP Server Name]
Load and execute system image from ROM or from TFTP server
C [address] Continue execution [optional address]
D /S M L V Deposit value V of size S into location L with modifier M
E /S M L Examine location L with size S with modifier M
G [address] Begin execution
H Help for commands
I Initialize
K Stack trace
L [filename] [TFTP Server IP address | TFTP Server Name]
Load system image from ROM or from TFTP server, but do not
begin execution
O Show configuration register option settings
P Set the break point
S Single step next instruction
T function Test device (? for help)

Deposit and Examine sizes may be B (byte), L (long) or S (short).
Modifiers may be R (register) or S (byte swap).
Register names are: D0-D7, A0-A6, SS, US, SR, and PC
>o                           <-- 2. con questo comando verificate e annotate il valore del registro di configurazione (qui 0x2102)
Configuration register = 0x2102 at last boot
Bit# Configuration register option settings:
15 Diagnostic mode disabled
14 IP broadcasts do not have network numbers
13 Boot default ROM software if network boot fails
12-11 Console speed is 9600 baud
10 IP broadcasts with ones
08 Break disabled
07 OEM disabled
06 Ignore configuration disabled
03-00 Boot file is cisco2-2500 (or 'boot system' command)

>o/r 0x2142   <-- 3. con questo comando modificate il valore del registro di configurazione settandolo a 0x2142
>i                   <-- 4. con questo comando eseguite il reload

System Bootstrap, Version 11.0(10c), SOFTWARE
Copyright (c) 1986-1996 by cisco Systems
2500 processor with 2048 Kbytes of main memory

F3: 3525700+86664+223888 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

Cisco Internetwork Operating System Software
IOS (tm) 3000 Software (IGS-I-L), Version 11.0(16), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1997 by cisco Systems, Inc.
Compiled Tue 24-Jun-97 12:20 by jaturner
Image text-base: 0x0301E644, data-base: 0x00001000

cisco 2511 (68030) processor (revision L) with 2048K/2048K bytes of memory.
Processor board ID 06255461, with hardware revision 00000000
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
1 Ethernet/IEEE 802.3 interface.
2 Serial network interfaces.
16 terminal lines.
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read ONLY)
--- System Configuration Dialog ---

At any point you may enter a question mark '?' for help.
Use ctrl-c to abort configuration dialog at any prompt.
Default settings are in square brackets '[]'.
Would you like to enter the initial configuration dialog? [yes]: no

Press RETURN to get started!

%LINK-3-UPDOWN: Interface Ethernet0, changed state to up
%LINK-3-UPDOWN: Interface Serial0, changed state to down
%LINK-3-UPDOWN: Interface Serial1, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed state to down
%SYS-5-RESTART: System restarted --
Cisco Internetwork Operating System Software
IOS (tm)
Router>3000 Software (IGS-I-L), Version 11.0(16), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1997 by cisco Systems, Inc.
Compiled Tue 24-Jun-97 12:20 by jaturner
Router>
%LINK-5-CHANGED: Interface Ethernet0, changed state to administratively down
%LINK-5-CHANGED: Interface Serial0, changed state to administratively down
%LINK-5-CHANGED: Interface Serial1, changed state to administratively down

Router>en    <-- 5. adesso il sistema non richiedera' la password e avrete la vecchia configurazione digitando "show conf"
Router#show conf
Using 1592 out of 32762 bytes
!
version 11.0
service udp-small-servers
service tcp-small-servers
!
hostname hts
!
enable secret 5 $1$w6B.$QsF548v6FxB3sU0QQcGTT.
enable password cisco
!
... snip...
line vty 0 4
password pippo
login
!
end

<-- 6. copiate la configurazione in RAM con "copy startup running" quindi cambiate le password

Router#sh ver <-- 7. notate che il registro di configurazione ha il valore 0x2142 ma che ora dobbiamo riportare a 0x2102
Cisco Internetwork Operating System Software
IOS (tm) 3000 Software (IGS-I-L), Version 11.0(16), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1997 by cisco Systems, Inc.
Compiled Tue 24-Jun-97 12:20 by jaturner
Image text-base: 0x0301E644, data-base: 0x00001000

ROM: System Bootstrap, Version 11.0(10c), SOFTWARE
ROM: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOFTWARE (
fc1)

Router uptime is 0 minutes
System restarted by power-on
System image file is "flash:igs-i-l.110-16", booted via flash

cisco 2511 (68030) processor (revision L) with 2048K/2048K bytes of memory.
Processor board ID 06255461, with hardware revision 00000000
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
1 Ethernet/IEEE 802.3 interface.
2 Serial network interfaces.
16 terminal lines.
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read ONLY)

--More-- Configuration register is 0x2142

Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#config-register 0x2102 <-- 8. con questo comando ripristiniamo il valore originale del registro di configurazione
Router(config)#exit
Router#copy run start <-- 9. memorizziamo la configurazione con le nuove password e il nuovo registro di configurazione
Building configuration...
[OK]
Router#sh ver
Cisco Internetwork Operating System Software
IOS (tm) 3000 Software (IGS-I-L), Version 11.0(16), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1997 by cisco Systems, Inc.
Compiled Tue 24-Jun-97 12:20 by jaturner
Image text-base: 0x0301E644, data-base: 0x00001000

ROM: System Bootstrap, Version 11.0(10c), SOFTWARE
ROM: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOFTWARE (
fc1)

Router uptime is 1 minute
System restarted by power-on
System image file is "flash:igs-i-l.110-16", booted via flash

cisco 2511 (68030) processor (revision L) with 2048K/2048K bytes of memory.
Processor board ID 06255461, with hardware revision 00000000
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
1 Ethernet/IEEE 802.3 interface.
2 Serial network interfaces.
16 terminal lines.
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read ONLY)

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

Router#reload
Proceed with reload? [confirm] <-- 10. riavviando il router partira' regolarmente

%SYS-5-RELOAD: Reload requested
System Bootstrap, Version 11.0(10c), SOFTWARE
Copyright (c) 1986-1996 by cisco Systems
2500 processor with 2048 Kbytes of main memory

F3: 3525700+86664+223888 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

Cisco Internetwork Operating System Software
IOS (tm) 3000 Software (IGS-I-L), Version 11.0(16), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1997 by cisco Systems, Inc.
Compiled Tue 24-Jun-97 12:20 by jaturner
Image text-base: 0x0301E644, data-base: 0x00001000

cisco 2511 (68030) processor (revision L) with 2048K/2048K bytes of memory.
Processor board ID 06255461, with hardware revision 00000000
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
1 Ethernet/IEEE 802.3 interface.
2 Serial network interfaces.
16 terminal lines.
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read ONLY)

Press RETURN to get started!

%LINK-3-UPDOWN: Interface Ethernet0, changed state to up
%LINK-3-UPDOWN: Interface Serial0, changed state to down
%LINK-3-UPDOWN: Interface Serial1, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed state to down
%SYS-5-CONFIG_I: Configured from memory by console
%SYS-5-RESTART: System restarted --
Cisco Internetwork Operating System Software
IOS (tm) 3000 Software (IGS-I-L), Version 11.0(16), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1997 by cisco Systems, Inc.
Compiled Tue 24-Jun-97 12:20 by jaturner
%LINK-5-CHANGED: Interface Ethernet0, changed state to administratively down
%LINK-5-CHANGED: Interface Serial0, changed state to administratively down
%LINK-5-CHANGED: Interface Serial1, changed state to administratively down
Router>sh ver
Cisco Internetwork Operating System Software
IOS (tm) 3000 Software (IGS-I-L), Version 11.0(16), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1997 by cisco Systems, Inc.
Compiled Tue 24-Jun-97 12:20 by jaturner
Image text-base: 0x0301E644, data-base: 0x00001000

ROM: System Bootstrap, Version 11.0(10c), SOFTWARE
ROM: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOFTWARE (
fc1)

Router uptime is 2 minutes
System restarted by reload
System image file is "flash:igs-i-l.110-16", booted via flash

cisco 2511 (68030) processor (revision L) with 2048K/2048K bytes of memory.
Processor board ID 06255461, with hardware revision 00000000
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
1 Ethernet/IEEE 802.3 interface.
2 Serial network interfaces.
16 terminal lines.
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read ONLY)

--More-- Configuration register is 0x2102

Router>

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