Password Recovery for Cisco Routers |
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Password Recovery for Cisco Routers January 29, 2019By Tuan Nguyen | 3 Min Read | Technical Level: Intermediate Need help accessing a used router? Or perhaps you’ve just misplaced the “Enable Password” and don’t have access to “Privileged EXEC mode”? No worries! Here are some step by step instructions and explanations to help you get through your problem! 1. Turn off or shut down the routerrommon 1> 4. Reinsert the compact flash card into the router.5. From the rommon prompt type “confreg 0x2142” and “reset” which may look like thisrommon 1>confreg 0x2142 rommon 2>reset Changing the configuration register to 0x2142 tells the router to bypass the current configuration file and load as if there is no configuration file on the router, and then the “Reset” command will take us out of rommon mode and boot the router like normal now that the flash is reinserted. 6. Wait for the router to boot up and enter “No” when prompted to enter the initial configuration dialogue.System Bootstrap, Version 15.0(1r)M1, RELEASE SOFTWARE (fc1) Copyright (c) 2009 by cisco Systems, Inc. TAC:Home:SW:IOS:Specials for info C2900 platform with 524288 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 subparagraphc) (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 IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2009 by Cisco Systems, Inc. Compiled Wed 02-Dec-09 15:23 by prod_rel_team Cisco CISCO2921/K9 (revision 1.0) with 475136K/49152K bytes of memory. Processor board ID FHH1230P04Y 1 DSL controller 3 Gigabit Ethernet interfaces 9 terminal lines 1 Virtual Private Network (VPN) Module 1 Cable Modem interface 1 cisco Integrated Service Engine-2(s) Cisco Foundation 2.2.1 in slot 1 DRAM configuration is 64 bits wide with parity enabled. 255K bytes of non-volatile configuration memory. 248472K bytes of ATA System CompactFlash 0 (Read/Write) 62720K bytes of ATA CompactFlash 1 (Read/Write) — System Configuration Dialog — Would you like to enter the initial configuration dialog? [yes/no]: n Press RETURN to get started! 7. Type “enable” at the Router> prompt.Router>enable Router# 8. Enter “copy startup-config running-config” this will copy the existing configuration file from NVRAM your running config or RAMRouter#copy startup-config running-config Destination filename [running-config]? 1324 bytes copied in 2.35 secs (662 bytes/sec) Router# 9. From the privilege prompt enter global configuration by typing “config t”Router#config t Router(config)# 10. From global configuration type in “enable secret ” to change the password to what you wantRouter(config)#enable secret cisco Router(config)# 11. Don’t forget to save your work!!! “copy running-config startup-config”Router(config)#end Router#copy running-config startup-config NOTE: If you’re not comfortable with removing the compact flash there is also a way to perform a password recovery by leaving the flash where it is. Follow the same instructions but ignore step #2 and step #4. After you turn on the router it should look a little something like this… System Bootstrap, Version 15.0(1r)M1, RELEASE SOFTWARE (fc1) Copyright (c) 2009 by cisco Systems, Inc. TAC:Home:SW:IOS:Specials for info C2900 platform with 524288 Kbytes of main memory program load complete, entry point: 0x80008000, size: 0x6fdb4c Self decompressing the image : ############################### While the image is decompressing enter the routers break sequence by pressing this should bring you to rommon mode where you can follow the same instructions to recover the password. Instructor Bio:Tuan Nguyen has over 20 years of experience as a consultant, systems engineer, and Certified Cisco Systems Instructor. He specializes in Cisco routers and Cisco Internetworking Operating Systems (IOS). Mr. Nguyen also has extensive knowledge in all aspects of Local Area Network (LAN), and Wide Area Network (WAN) technologies, including design, implementation and support of Cisco IP Unified Communication, IP Multicasting, Multiprotocol Label Switching (MPLS), Frame Relay, Routing and Switching, Cisco Internetwork Service Provider (ISP), and Cisco Security. He is also proficient in interconnectivity, data communications, network and analyzing, baselining and troubleshooting, router configuration, Multi-Protocol routing, protocol analysis, security, and firewall configuration. Tuan teaches courses across the enterprise, security, service provider, Data Center, and voice curricula. Tuan infuses best practices from his experience into what he teaches and relates the material to the tasks students perform on the job.
To see networking training offered at Sunset Learning Institute, please visit our Routing & Switching page. See what tutorial videos we have on our YouTube Channel. Tags: Cisco Routing and Switching |
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