Network security experts are Industry's demand in next era not just certified with basic knowledge.

We are dedicated network expert team specialized in designing, implementation and training the aspirants in computer networks.

Ask your queries @ +91 99 88 74 1983 (Navneet Sharma)
Mail: navneetlinuxexpert@gmail.com
Url: www.cbitss.com

Password Recovery of Cisco Router 2600

Friday, August 19, 2016



Having problem to login in router or forgotten password? This lab will tell you resetting the password modern Cisco routers from 2600 Series and later.

Now if you are not accessing you exac password you need to break it. Bellow given process can give you detailed idea to break password.

Step 1

Switch on router and wait till boot process will start. When boot process will start we need to break that booting sequence by pressing CTRL and PAUSE BREAK. This will lead you towards Rommon Mode.

System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)
Copyright (c) 2003 by cisco Systems, Inc.
C2600 platform with 262144 Kbytes of main memory

monitor: command "boot" aborted due to user interrupt
rommon 1 >

Step2

Routers have configuration register values which are 0x2102 which is default configuration register value and second is 0x2142 which also can be changed in Rommon mode.  In Rommon mode we need to change this value to reset password and for that commands are given bellow.

rommon 1 >confreg 0x2142
rommon 2 >reset
This reset command will reload router and will take you to the user interface mode with latest configuration register value.

Step 3

 Now when you are logged in to the router you need to do all the settings and configurations again what you have done previously or have to set passwords again.

--- System Configuration Dialog ---

Would you like to enter the initial configuration dialog? [yes/no]: n


Press RETURN to get started!

Router>enable
Router#copy start run
Destination filename [running-config]?
506 bytes copied in 3.868 secs (168 bytes/sec)
Cbitss#configure terminal
Cbitss(config)#enable secret NEWENABLEPASSWORD
Cbitss(config)#line con 0
Cbitss(config-if)#password NEWPASSWORD
Cbitss(config-if)#end
Cbitss#copy run start
Destination filename [startup-config]?
Building configuration...
[OK]
Cbitss#

Alternative

Erase NV RAM so that it will remove all previous settings and configurations from Cisco router. After erasing it again you need to set default configuration register value again.

--- System Configuration Dialog ---

Would you like to enter the initial configuration dialog? [yes/no]: n


Press RETURN to get started!

Router>enable
Router#write erase
Erasing the nvram filesystem will remove all files! Continue? [confirm]
[OK]
Erase of nvram: complete

Router#configure terminal
Router(config)#config-register 0x2102
Router(config)#end

Now your router is accessible again.
We as Cbitss Technologies providing CCNA Training in Chandigarh... you can contact us @ 9988741983 

How to configure Standard ACL in Cisco Router

Thursday, August 18, 2016


ACL(Access Control List) is to secure your network by setting some rules on Cisco Routers. Here in ACL you can allow or deny the access of any network or a particular host. ACL has two types Standard ACL and Extended ACL. Here in this article we will start from Standard ACL and then will move to Extended. Let see the configuration of the Standard ACL .


Take one scenario or a network topology where we can implement Standard ACL.




In this Scenario we are going to block access of 10.0.0.2 so that this host should not communicate with Server. We will do configuration on the router 2 which is connected to Server. Lest do configuration of Standard ACL...

Router2(config)#access-list 10 deny host 10.0.0.2
Router2(config)#access-list 10 permit any

After creating this ACL we need to apply them on inbound and outbound interfaces..

Router2(config)#int fa0/1
Router2(config-if)#ip access-group 10 in
Router2(config-if)#exit
These are the only command by which you can block this particular host to ping that server. Now your server is secure which is only accessible by 10.0.0.3. 

For CCNA Training in Chandigarh You can contact us @ 9988741983

IPV4 Vs IPV6

Wednesday, August 17, 2016


IPV4 Vs IPV6

It became many years that IPV6 has released, but very less amount of people know about this. Many people even do not know that what is IPV6 and whats its purpose too. This article will introduce you with IPV6 and will tell you that what is the future with IPV6.
It is a set of rules which is used to governing the format of data sent over the Internet or network. This is the way how your information moves over the Internet.


IPV4


Allows for 4 billion Internet Addresses for users
32 Bits Logical Addresse
This is no longer enough for all of the devices on earth
Designed in the late 70s, when the modern world of multiple wasn't fathomable. 

IPV6
Allows for 340 trillion, trillion, trillion Internet Addresses
128 Bits Addresse
That looks like this: 340,000,000,000,000,000,000,000,000,000,000
Because of this every person on this earth can have billion of network addresses for their own devices.
 



More than 4 billion devices already share addresses. In future there are many device who gona use Ip addresses like watches, Fridges and cars will be needing IP Addresses.
 

 

How to configure SSH in Cisco Router

Saturday, August 13, 2016

Prepare one topology with the combination of Cisco routers and switches. Make sure your network is working properly. Now in topology you can configure SSH in any of the router you want.



Now if you have chosen router where you will configure SSH Start configuring it.

1. Set hostname and domain-name


Here are some commands to set hostname and Domain name for the router

# config t
(config)# hostname cbitss
(config)# ip domain-name Cbitss.com

2. Generate the RSA Keys
Router should have RSA keys that it will use during the SSH process. Yo can set this with the command given bellow.
cbitss(config)# crypto key generate rsa
 The name for the keys will be: cbitss.cbitss.com
 Choose the size of the key modulus in the range of 360 to 2048 for your
   General Purpose Keys. Choosing a key modulus greater than 512 may take
   a few minutes.

How many bits in the modulus [512]: 1024
 % Generating 1024 bit RSA keys, keys will be non-exportable...[OK]


3. Setup the Line VTY configurations
Here in Line VTY you need to set SSH as input method. You also can set it to login local.
# line vty 0 4
(config-line)# transport input ssh
(config-line)# login local
(config-line)# exit

4. Create the username password
Here yo need to set username and password by which you have to login in router.
cbitss# config t
Enter configuration commands, one per line.  End with CNTL/Z.

cbitss(config)# username cbitss password cbitss@123

You also need to set Enable passwords.
cbitss# enable secret admin@cbitss
cbitss# service password-encryption


5. Verify SSH access
On router to check either SSH is enabled or not you need to ru bellow commands.
cbitss# sh ip ssh
SSH Enabled - version 1.99
Authentication timeout: 120 secs; Authentication retries: 3
After checking the status of the SSH now you can take access from computer to router. To take access from PC to router you can run  following commands
remote-machine# ssh 192.168.101.2
login as: cbitss
Using keyboard-interactive authentication.
Password:

cbitss>en
Password:
cbitss#
Like this you can configure SSH in any Cisco Device.


Benefits of doing CCNA

CCNA is related to computer networking field and a Cisco certification. After doing this course person become eligible to work in computer networking field and can make his career bright. Here are some benefits of doing CCNA.


  1. Its validates one's specific technical skills
  2. Considerably increasing the possessor's professional credibility  
  3. World known Certification
  4. Open Jobs doors
  5. Best step to enter in the world of computer networking
  6. This is junction to select your best track
  7. Most considerable profile these days
  8. Enhance your thinking for networking
  9. Candidate come to know about more networking devices
  10. Do white collar job anywhere with handsome salary  





Considering these benefits you can pursue your career and can make your future secure in this field.

How to enable Telnet in Windows 7

Thursday, October 4, 2012


It is very true that by default telnet service in windows 7 never enabled. We have to enable that service manually.  In windows Xp this service will enabled already.  But in windows 7 how we can enable that service lets see…

Path to Telnet service.

Start > Control Panel > Program and Features > Turn windows features on or off > Telnet Client/Server > ok.

In control panel you have to choose option program and features and after that you to follow the steps which are given bellow in the form of images.

Step 1: click on the option which is marked in the image.




Step 2: select the service.

Step 3: click on OK to finish installation.



Like this Telnet service gets enable.