How can the administrator maintain remote access to the networks even during quiet mode? Quiet mode behavior can be enabled via an ip access-group command on a physical interface. Quiet mode behavior will only prevent specific user accounts from attempting to authenticate.
Full Answer
How do I enable quiet mode on a Cisco router?
Quiet mode is enabled via the login quiet-mode access-class command. Quiet mode behavior can be overridden for specific networks by building and implementing an access control list (ACL). What is a characteristic of the Cisco IOS Resilient Configuration feature?
How can the administrator maintain remote access to the networks during quiet mode?
A network administrator notices that unsuccessful login attempts have caused a router to enter quiet mode. How can the administrator maintain remote access to the networks even during quiet mode? Quiet mode behavior can be enabled via an ip access-group command on a physical interface.
How do I Secure my Cisco router?
Locate the router in a secure locked room that is accessible only to authorized personnel.* Configure secure administrative control to ensure that only authorized personnel can access the router. Keep a secure copy of the router Cisco IOS image and router configuration file as a backup.
How can I improve the security of my router?
Disable all unused ports and interfaces to reduce the number of ways that the router can be accessed. Of the three areas of router security, physical security, router hardening, and operating system security, physical security involves locating the router in a secure room accessible only to authorized personnel who can perform password recovery.
What is quiet mode on Cisco router?
With Cisco quiet mode enabled, your Cisco device won't allow any other devices to connect to it after five failed login attempts, and will block all users from logging in for 120 seconds.
What is quiet mode access list?
While the quiet mode ACL will allow login attempts from hosts matched in the ACL, those very same hosts can trigger the router to enter quiet mode. If you already have an access-class assigned to the VTY lines and quiet mode kicks in, the quiet mode ACL will be applied during the block-for time.
What command must be issued to enable login enhancements on a Cisco router?
Explanation: Cisco IOS login enhancements can increase the security for virtual login connections to a router. Although login delay is a login enhancement command, all login enhancements are disabled until the login block-for command is configured.
Which command will block login attempts on RouterA for a period of 30 seconds if there are 2 failed login attempts within 10 seconds?
Which command will block login attempts on RouterA for a period of 30 seconds if there are 2 failed login attempts within 10 seconds? The correct syntax is RouterA(config)# login block-for (number of seconds) attempts (number of attempts) within (number of seconds).
What is global configuration mode command that allows you to specify the number of failed login attempts that trigger a quiet period?
For login block, you define the number of failed connection attempts that trigger the quiet period with the global configuration mode command login block-for.
How can a network administrator maintain router access with remote management during quiet mode?
How can the administrator maintain remote access to the networks even during quiet mode? Quiet mode behavior can be enabled via an ip access-group command on a physical interface. Quiet mode behavior will only prevent specific user accounts from attempting to authenticate.
What is login command in Cisco?
Login command is used in VTY for password that is specified to be checked at login. If you do not use login command you will not able to use the specified password for the vty to login. Login can also be used with login local. In which you can config a username and password on the router to be auth.
What two tasks are router hardening?
Two tasks that can be done to harden a router are disabling unused ports and interfaces and securing administrative access to the router.
What is Cisco default password?
cisco3. When the login page opens, enter the username and password. The default username is cisco. The default password is cisco.
When applied to a router which command would help mitigate brute force password attacks?
When applied to a router, which command would help mitigate brute-force password attacks against the router? Explanation: The login block-for command sets a limit on the maximum number of failed login attempts allowed within a defined period of time.
Why is the login command required?
The login command validates the user's account, ensuring authentication, logins enabled properly, and correct capacity for the port that is used for the login. The login command verifies the user's identity by using the system defined authentication methods for each user.
What is ACL technology?
A network access control list (ACL) is made up of rules that either allow access to a computer environment or deny it.
What is the difference between standard and extended ACL?
There are two types of IPv4 ACLs: Standard ACLs: These ACLs permit or deny packets based only on the source IPv4 address. Extended ACLs: These ACLs permit or deny packets based on the source IPv4 address and destination IPv4 address, protocol type, source and destination TCP or UDP ports, and more.
What are ACL commands?
An access control list (ACL) consists of one or more access control entries (ACEs) that collectively define the network traffic profile. This profile can then be referenced by Cisco IOS XR Software software features such as traffic filtering, priority or custom queueing, and dynamic access control.
What is in and out in access-list?
In–when you are running traffic coming INTO the interface through an ACL. Out–when you are running traffic leaving the interface through an ACL. If you want to filter packets that is coming in, you want to use the in; and if you want to filter packets that is coming out then you use the out.
Introduction
I decided to publish this article even if not treating the newest arguments and/or something strictly connected to programming. However some subjects seems to be evergreen and I still see around a horror configurations made by "experts".
Configuring virtual terminal lines
Let´s start, first thing that I did is to separate the virtual terminal lines in two groups, the first one will be reserved for the connections from external networks meanwhile the second will be used for the connections from internal networks.
SSH settings
Now we need to make sure that we set up the hostname and the domain name, otherwise, generating the cryptography key will fail. If there is the default hostname set, it would be advisable to change it. Both can be set with the following commands:
Setting the access list's and details
In order to prevent the access to a virtual terminal interfaces that accepts the telnet connection let's suppose that our internal network is 10.10.10.0\24 (10.10.10.x network with a mask 255.255.255.0). Because of that we will create an access list that accepts the traffic only from internal network and block the traffic from all other sources.
Logging and improvements
Initially I tough that this is sufficient but once I configured logging, I found that, meanwhile testing, there was no trace about the who and when connected to the router. As I believe that this are information's that we should log, I made a little research and found the following commands:
Conclusion
I didn't went in detail on all steps supposing that you have basic knowledge on how to operate on Cisco IOS. All the information's I got from Cisco.com. Also this procedure where valid by the end of 2008 when the original article was written. However it should not be drastically changed in the newest version of IOS.
License
This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)
What is Cisco Secure Endpoint?
Cisco Secure Endpoint New packages fit for every organization Every Cisco Secure Endpoint (formerly AMP for Endpoints) package comes with Cisco SecureX built-in. It’s our cloud-native platform that integrates all your security solutions into one view wit... view more
Does remote VPN work on 1841 router?
Thk you very much. i got my remote vpn to work on my 1841 router with site to site still working.
What does quiet mode do?
Quiet mode behavior will only prevent specific user accounts from attempting to authenticate.
How to create a view on Cisco router?
1) AAA must be enabled. 2) the view must be created. 3) a secret password must be assigned to the view. 4) commands must be assigned to the view. 5) view configuration mode must be exited.
Why do we need OSPF authentication?
The reason to configure OSPF authentication is to mitigate against routing protocol attacks like redirection of data traffic to an insecure link, and redirection of data traffic to discard it . OSPF authentication does not provide faster network convergence, more efficient routing, or encryption of data traffic.
Why are all VTY ports automatically configured for SSH?
All vty ports are automatically configured for SSH to provide secure management.
What are the three areas of router security?
There are three areas of router security to maintain: 1) physical security . 2) router hardening. 3) operating system security. Which recommended security practice prevents attackers from performing password recovery on a Cisco IOS router for the purpose of gaining access to the privileged EXEC mode?
What is Cisco IOS login enhancement?
Cisco IOS login enhancements can increase the security for virtual login connections to a router. Although login delay is a login enhancement command, all login enhancements are disabled until the login block-for command is configured.
Can commands set on a higher privilege level be used for lower privilege users?
Commands set on a higher privilege level are not available for lower privilege users.*
What does quiet mode do?
Quiet mode behavior will only prevent specific user accounts from attempting to authenticate.
How to configure SSH on Cisco router?
Generate the SSH keys.*. There are four steps to configure SSH support on a Cisco router: Step 1: Set the domain name. Step 2: Generate one-way secret keys. Step 3: Create a local username and password. Step 4: Enable SSH inbound on a vty line.
Why are all VTY ports automatically configured for SSH?
All vty ports are automatically configured for SSH to provide secure management.
What is Cisco IOS login enhancement?
Cisco IOS login enhancements can increase the security for virtual login connections to a router. Although login delay is a login enhancement command, all login enhancements are disabled until the login block-for command is configured.
What is snapshot of router?
A snapshot of the router running configuration can be taken and securely archived in persistent storage.*
How to create a view on Cisco router?
1) AAA must be enabled. 2) the view must be created. 3) a secret password must be assigned to the view. 4) commands must be assigned to the view. 5) view configuration mode must be exited. 4.
Why do we need OSPF authentication?
The reason to configure OSPF authentication is to mitigate against routing protocol attacks like redirection of data traffic to an insecure link, and redirection of data traffic to discard it . OSPF authentication does not provide faster network convergence, more efficient routing, or encryption of data traffic.
What is the purpose of Disable all unused ports and interfaces?
E.) Disable all unused ports and interfaces to reduce the number of ways that the router can be accessed.
Why are all VTY ports automatically configured for SSH?
All vty ports are automatically configured for SSH to provide secure management.
Is there access control on routers?
There is no access control to specific interfaces on a router.
Introduction
- I decided to publish this article even if not treating the newest arguments and/or something strictly connected to programming. However some subjects seems to be evergreen and I still see around a horror configurations made by "experts". I also saw from CP pools that many of you apart for development perform even other task as networking configuration or system configura…
Ssh Settings
- Now we need to make sure that we set up the hostname and the domain name, otherwise, generating the cryptography key will fail. If there is the default hostname set, it would be advisable to change it. Both can be set with the following commands:
Setting The Access List's and Details
- In order to prevent the access to a virtual terminal interfaces that accepts the telnet connection let's suppose that our internal network is 10.10.10.0\24 (10.10.10.x network with a mask 255.255.255.0). Because of that we will create an access list that accepts the traffic only from internal network and block the traffic from all other sources. In...
Logging and Improvements
- Initially I tough that this is sufficient but once I configured logging, I found that, meanwhile testing, there was no trace about the who and when connected to the router. As I believe that this are information's that we should log, I made a little research and found the following commands:
Conclusion
- I didn't went in detail on all steps supposing that you have basic knowledge on how to operate on Cisco IOS. All the information's I got from Cisco.com. Also this procedure where valid by the end of 2008 when the original article was written. However it should not be drastically changed in the newest version of IOS. If so, check the documentation on cisco.com and eventually post your qu…