Hi All, I have been unboxing Cisco ASA 5512-X and I am already configure: Enable telnet access from inside. Configure aaa authentication telnet console LOCAL. Username and password for User Local. When I am telnet the device and input username password from LOCAL always wrong username password. The program attempts to open a connections to the telnet port (23) of random ips, if it succeeds the program logs the success in a log file telnet.txt for later analysis. The program then repeats, so if you run a few instances of the program for a few hours you can end up with a list of around 200 telnet boxes.Originally the program is written. Jan 19, 2020 The list, which was published on a popular hacking forum, includes each device's IP address, along with a username and password for the Telnet service, a remote access protocol that can be used to. Dec 17, 2019 In this example, passwords are configured for users attempting to connect to the router on the VTY lines using Telnet. From the privileged EXEC (or 'enable') prompt, enter configuration mode and enter username/password combinations, one for each user for whom you want to allow access to the router. Apr 17, 2020 Console Port Overview. The console port on the router is an EIA/TIA-232 asynchronous, serial connection with no flow control and an RJ-45 connector. The console port is used to access the router and is located on the front panel of the Route Processor. For information on accessing the router using the console port, see Using Cisco IOS XE Software.
In this article we will examine password recovery process for Cisco devices. Sometimes you can forget the passwords and need a recovery. Or may be you are a hacker and you may want to break the device’s password ? Whatever, it is time to take a look for the process. In this article I will tell you how you can recover the password of Cisco 2600 or 2800 series routers.
First of all, you need a console cable and software for serial connection ( like Putty ). Plug the console cable to console port and choose “serial” connection on Putty. Select the COM port that your computer using correctly and click “connect”. When your serial connection is made correctly, power off the cisco device and turn it on again. After you need to press “break” button on your keyboard and go to the rommon mode ! Here are the next steps :
- Type confreg 0x2142
- Type “reset”
- Type “no”
- Type “enable”
- Type “copy startup-config running-config”
- Type “configure terminal”
- Type “enable secret ” // like “enable secret myhardpassword”
- Type “config-register ” // like “config-register 0x2102”
- Type “write memory”
That is all ! You successfully recovered the password of your Cisco router !
Cisco Line VTY (Virtual terminal line):
VTY is short for Virtual Terminal lines and are used for accessing the router remotely through telnet by using these virtual router interfaces.The number of Cisco vty lines is not consistent in all routers, but different cisco routers/switches can have different number of vty lines. The more vty lines a router or switch has the more users can access that device simultaneously through telnet.
You should also learn about encrypted enable mode password or enable secret cisco password.
Checking the number of Cisco VTY lines:
The number of vty lines determine the number of simultaneous telnet connections we can have to that specific cisco router/switch. From security perspective it is extremely important to know the number of virtual lines your router / switch has, and these vty lines must be secured by a password to prevent unauthorized telnet access.
![Password Password](/uploads/1/1/9/0/119021896/793794525.png)
Although it is not a requirement of setting vty line password, but generally a good practice to secure console line, enable mode and auxiliary line by setting a password for each. Read more about console line password, enable password, auxiliary line password and enable secret password.
When you are at global configuration mode type line vty ? this command will display the number of vty lines or interfaces your router has.
Setting line VTY / TELNET Password:
![Port Port](/uploads/1/1/9/0/119021896/861926143.jpg)
Hack Cisco Router Password Telnet Port 1
For setting a password for VTY lines you should be at the global configuration mode. As we have 16 interfaces/lines ranging from 0-15 and we will specify a single password for all these, in order to secure our router. 16 interfaces/lines means that we can have 16 simultaneous telnet (remote) connections to this router.
When at global configuration mode type line vty 0 15 for entering vty line configuration mode.
Hack Cisco Router Password Telnet Port 2
Command syntax:line vty starting-interface ending-interface-range
How to remove cisco line vty password:
In cisco removing or undoing a settings is very easy, just type no before the command which you used for making changes. For removing vty line password go to the global configuration mode than to line configuration mode and than type no password. For adding extra security to a router you should also read How Set Line Console password, How to set auxiliary line password and how to set enable secret password on cisco router.
When you press enter the line vty cisco password will be disabled. Now that you have learned how to set line vty password and how to remove vty password(Telnet Password), you may want to learn How to Telnet a Cisco Router.
If you liked this tutorial please do share with your friends and comment for any queries.