Couple of months ago we upgraded the ADSL line at our branch office from Home to Business line. The purpose of transforming the service to have static public IP’s.
We were in need for public IP’s to publish our web resources at the branch office
Also Home ADSL connection ISP leases the DHCP IP address to the customers and this will IP can change on frequent basis and sometimes you will find it difficult for port forwarding
Anyway so after the upgrade we were given pre-configured Cisco Router by ISP. Unfortunately, the LAN subnet configured on the router was conflicting with our IP Addressing Schema. Therefore, it was important to change the subnet on the router.
When I access to the router through the console and issue sh running-config command but the resulting configuration was virtually blank.
Moreover, I was not privileged to enter configuration mode. Then I used the command in exec mode
R1# sh run configCurrent configuration : 3743 bytes! No configuration change since last restartversion 15.1no service padservice timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption!hostname R1!boot-start-markerboot-end-marker!end
Moreover, I was not privileged to enter configuration mode. Then I used the command in exec mode
Show privilege: This command displays the current privilege. Here's an example:
With this privilege only the configure commands that are permitted are actually displayed.
Solution
Follows the below steps to resolve this issue and of course we can’t’ afford to lose the configurations
1. Enter into the router in rom monitor mode.
2. rommon 1 > confreg 0x2142
You must reset or power cycle for new config to take effect
rommon 2 > reset
3. The router will now reset and start its normal bootup process; however, the current configuration will be ignored. When the bootup is complete, you will be prompted to 'enter the initial configuration dialog', answer 'no':
4. Next step is to enter 'Privileged Mode' and load the router's configuration from nvram.
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