Recently we had securely wipe out the configuration data of a few cisco routers at LoreaTec and I thought it could be useful to post it here. After you complete the steps bellow the router will be back to factory settings, the same as when you bought it new.<\/p>\n
The command output may be a little different depending on the model but with the steps bellow you should be able to wipe the data of most CISCO routers.<\/p>\n
I have marked in RED<\/span> the commands you need to input to make it clearer. The rest is explanation or router output example.<\/p>\n 1-Turn on the router. Before the prompt loads press Ctrl+C<\/span> (on some models you need to press Ctrl+Enter+Break<\/span>) and you will see the as bellow.<\/p>\n Self decompressing the image : <\/p>\n 2-Enter?confreg 0x2142 as you see bellow:<\/span><\/span><\/p>\n rommon 1 > confreg 0x2142 <\/p>\n 3-Now it says rommon 2 > enter reset<\/span>? command so that the router reboots.<\/p>\n rommon 2 > reset Self decompressing the image : Use, duplication, or disclosure by the Government is cisco Systems, Inc. <\/p>\n Cisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2) A summary of U.S. laws governing Cisco cryptographic products may be found at: If you require further assistance please contact us by sending email to — System Configuration Dialog —<\/p>\n Continue with configuration dialog? [yes\/no]:n<\/p>\n <\/p>\n Press RETURN to get started! Router>enable Router#erase startup-config Erasing the nvram filesystem will remove all configuration files! Continue? [confirm] Press enter<\/span> key Router#conf t Router(config)#config-register 0x2102 Router(config)#end<\/p>\n %SYS-5-CONFIG_I: Configured from console by console Router#reload Self decompressing the image : Use, duplication, or disclosure by the Government is cisco Systems, Inc. <\/p>\n Cisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2) A summary of U.S. laws governing Cisco cryptographic products may be found at: If you require further assistance please contact us by sending email to Continue with configuration dialog? [yes\/no]:<\/p>\n <\/p>\n 12-Select no<\/span> and you are back to the initial prompt. Now the router has the same settings as when it was bought.<\/p>\n Continue with configuration dialog? [yes\/no]: n <\/p>\n Router><\/p>\n <\/p>\n Please link to this post if the information was useful. Please contact us at LoreaTec if you have any comments or if there is any mistake.<\/p>\n","protected":false},"excerpt":{"rendered":" Recently we had securely wipe out the configuration data of a few cisco routers at LoreaTec and I thought it could be useful to post it here. After you complete the steps bellow the router will be back to factory settings, the same as when you bought it new. The command output may be a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[183],"tags":[],"class_list":["post-702","post","type-post","status-publish","format-standard","hentry","category-cisco-networking"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/loreatec.jp\/e\/blog\/index.php?rest_route=\/wp\/v2\/posts\/702","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/loreatec.jp\/e\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/loreatec.jp\/e\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/loreatec.jp\/e\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/loreatec.jp\/e\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=702"}],"version-history":[{"count":4,"href":"https:\/\/loreatec.jp\/e\/blog\/index.php?rest_route=\/wp\/v2\/posts\/702\/revisions"}],"predecessor-version":[{"id":706,"href":"https:\/\/loreatec.jp\/e\/blog\/index.php?rest_route=\/wp\/v2\/posts\/702\/revisions\/706"}],"wp:attachment":[{"href":"https:\/\/loreatec.jp\/e\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=702"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/loreatec.jp\/e\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=702"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/loreatec.jp\/e\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=702"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n#######################
\nmonitor: command “boot” aborted due to user interrupt
\nrommon 1 ><\/p>\n
\nrommon 2 ><\/p>\n
\nSystem Bootstrap, Version 12.3(8r)T8, RELEASE SOFTWARE (fc1)
\nCisco 1841 (revision 5.0) with 114688K\/16384K bytes of memory.<\/p>\n
\n########################################################################## [OK]
\nRestricted Rights Legend<\/p>\n
\nsubject to restrictions as set forth in subparagraph
\n(c) of the Commercial Computer Software – Restricted
\nRights clause at FAR sec. 52.227-19 and subparagraph
\n(c) (1) (ii) of the Rights in Technical Data and Computer
\nSoftware clause at DFARS sec. 252.227-7013.<\/p>\n
\n170 West Tasman Drive
\nSan Jose, California 95134-1706<\/p>\n
\nTechnical Support: http:\/\/www.cisco.com\/techsupport
\nCopyright (c) 1986-2007 by Cisco Systems, Inc.
\nCompiled Wed 18-Jul-07 04:52 by pt_team
\nImage text-base: 0x60080608, data-base: 0x6270CD50
\nThis product contains cryptographic features and is subject to United
\nStates and local country laws governing import, export, transfer and
\nuse. Delivery of Cisco cryptographic products does not imply
\nthird-party authority to import, export, distribute or use encryption.
\nImporters, exporters, distributors and users are responsible for
\ncompliance with U.S. and local country laws. By using this product you
\nagree to comply with applicable laws and regulations. If you are unable
\nto comply with U.S. and local laws, return this product immediately.<\/p>\n
\nhttp:\/\/www.cisco.com\/wwl\/export\/crypto\/tool\/stqrg.html<\/p>\n
\nexport@cisco.com.
\nCisco 1841 (revision 5.0) with 114688K\/16384K bytes of memory.
\nProcessor board ID FTX0947Z18E
\nM860 processor: part number 0, mask 49
\n2 FastEthernet\/IEEE 802.3 interface(s)
\n2 Low-speed serial(sync\/async) network interface(s)
\n191K bytes of NVRAM.
\n63488K bytes of ATA CompactFlash (Read\/Write)
\nCisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2)
\nTechnical Support: http:\/\/www.cisco.com\/techsupport
\nCopyright (c) 1986-2007 by Cisco Systems, Inc.
\nCompiled Wed 18-Jul-07 04:52 by pt_team
\n4- It asks you if you want to continue with configuration dialog. Enter n<\/span> en press enter<\/span> two times.<\/p>\n
\nRouter>
\n5-escribis enable<\/p>\n
\nRouter#
\n6-Write startup-config<\/span> and press enter<\/span> key.<\/p>\n
\n7-Write erase startup-config<\/span> and press enter<\/span> key again.<\/p>\n
\n[OK]
\nErase of nvram: complete
\n%SYS-7-NV_BLOCK_INIT: Initialized the geometry of nvram
\nRouter#
\n8-Write conf t<\/span> or configure terminal<\/span> to continue with the router set up.<\/p>\n
\nEnter configuration commands, one per line. End with CNTL\/Z.
\nRouter(config)#
\n9-Write config-register 0x2102<\/span><\/p>\n
\nRouter(config)#
\n10-Write end<\/span> to make the router go back to factory settings.<\/p>\n
\nRouter#
\n11-Write reload<\/span> to process and save all the changes and let it boot.<\/p>\n
\nProceed with reload? [confirm]
\n%SYS-5-RELOAD: Reload requested by console. Reload Reason: Reload Command.
\nySystem Bootstrap, Version 12.3(8r)T8, RELEASE SOFTWARE (fc1)
\nCisco 1841 (revision 5.0) with 114688K\/16384K bytes of memory.<\/p>\n
\n########################################################################## [OK]
\nRestricted Rights Legend<\/p>\n
\nsubject to restrictions as set forth in subparagraph
\n(c) of the Commercial Computer Software – Restricted
\nRights clause at FAR sec. 52.227-19 and subparagraph
\n(c) (1) (ii) of the Rights in Technical Data and Computer
\nSoftware clause at DFARS sec. 252.227-7013.<\/p>\n
\n170 West Tasman Drive
\nSan Jose, California 95134-1706<\/p>\n
\nTechnical Support: http:\/\/www.cisco.com\/techsupport
\nCopyright (c) 1986-2007 by Cisco Systems, Inc.
\nCompiled Wed 18-Jul-07 04:52 by pt_team
\nImage text-base: 0x60080608, data-base: 0x6270CD50
\nThis product contains cryptographic features and is subject to United
\nStates and local country laws governing import, export, transfer and
\nuse. Delivery of Cisco cryptographic products does not imply
\nthird-party authority to import, export, distribute or use encryption.
\nImporters, exporters, distributors and users are responsible for
\ncompliance with U.S. and local country laws. By using this product you
\nagree to comply with applicable laws and regulations. If you are unable
\nto comply with U.S. and local laws, return this product immediately.<\/p>\n
\nhttp:\/\/www.cisco.com\/wwl\/export\/crypto\/tool\/stqrg.html<\/p>\n
\nexport@cisco.com.
\nCisco 1841 (revision 5.0) with 114688K\/16384K bytes of memory.
\nProcessor board ID FTX0947Z18E
\nM860 processor: part number 0, mask 49
\n2 FastEthernet\/IEEE 802.3 interface(s)
\n2 Low-speed serial(sync\/async) network interface(s)
\n191K bytes of NVRAM.
\n63488K bytes of ATA CompactFlash (Read\/Write)
\nCisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2)
\nTechnical Support: http:\/\/www.cisco.com\/techsupport
\nCopyright (c) 1986-2007 by Cisco Systems, Inc.
\nCompiled Wed 18-Jul-07 04:52 by pt_team
\n— System Configuration Dialog —<\/p>\n
\nPress RETURN to get started!<\/p>\n