While a network administrator forgot the password over the cisco router or switch, you need to reset password for cisco router or recover password for cisco router, this is a common mistaken for a Network Administrator, always forgot the password if long time did not do configuration for the cisco router. how to reset cisco router password? if you forgot the password to login cisco router?

Router>enable
Password:
Password:
Password:
% Bad secrets

Router>show version
Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Wed 18-Jul-07 06:21 by pt_rel_team

ROM: System Bootstrap, Version 12.1(3r)T2, RELEASE SOFTWARE (fc1)
Copyright (c) 2000 by cisco Systems, Inc.

System returned to ROM by power-on
System image file is “c2800nm-advipservicesk9-mz.124-15.T1.bin”

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

cisco 2811 (MPC860) processor (revision 0×200) with 60416K/5120K bytes of memory
Processor board ID JAD05190MTZ (4292891495)
M860 processor: part number 0, mask 49
2 FastEthernet/IEEE 802.3 interface(s)
239K bytes of NVRAM.
62720K bytes of processor board System flash (Read/Write)

Configuration register is 0×2102

Router>

Just remember the current cisco router register number “2102“, after that, on and off your cisco router, press crtl + backspace + break to enter the NVram (more…)

Posted by calvyn | 27 Comments »

How to calculate Subnet mask, Calculate Variable Length Subnet Mask (VLSM)

Few week back I face one confusion when one of our client require to increase their company computer from 200 to 1000′s PC, in the near future. They require to change the subnet mask in all their computer, server, and manageable switch. The client currently are using 255.255.255.0 for their subnet mask, and require to change it to 255.255.252.0. I have to assist them to change the setting in their 3Com manageable switches. I was confuse, why set to 252 instead of 255?

After Re-attend my CCNA class, CCNA in Penang, I understand how this work and also get the method on how to calculate subnet mask.

Normally for class C IP address, we will put the subnet mask as 255.255.255.0, but some other case, they are putting 255.255.255.128, 255.255.255.192, 255.255.255.224…. So when will use 128 or 192 or 225…. as your subnet mask?

For example, We use 128 (255.255.255.128), when we require not more then 126′s PC in the network.

Method to calculate subnet mask (more…)

Posted by calvyn | 15 Comments »

There are few big LCD, about 40″+ inch hanging around few corner on Seagate Factory, while my company project over the Seagate factory few days ago, realize that the LCD always repeat this new video, kinda nice, and also found that this video is come from a group of singer name “Sniper Twins“, the song name are “Stack the memory to the sky“, is a new video “Computer Friend” for Seagate. The full name of this song name “Computer Friends” Stack the Memory by Sniper Twins feat. Rob Collier

I have attach this song “Stack the memory to the sky” with Lyric, (more…)

Posted by calvyn | 5 Comments »