Configuring Cisco ASA Active/Standby Failover

-

In this article, I will share the configurations used in the within the video below. The configurations enable one to configure Active/Standby ASA’s with failover and redundant failover links.


ASAv1 Configurations

interface redundant 1
member-interface g0/0
member-interface g0/1
no shutdown#Interface G0/0
no shutdown#Interface G0/1
no shutdown

Configure failover settings on ASAv1

failover lan unit primary
failover lan interface redundant 1 (This is the interface used for the failover link)
failover interface failover redundant 1 (‘failover’ = the name I gave the failover interface redundant 1)
failover interface ip failover 10.0.0.1 255.255.255.0 standby 10.0.0.2
failover key cisco (Key needs to match on both ASA’s)
failover (Enables failover)
write memory (Save your configuration)

Configure Basic Device Settings

interface g0/2
nameif OUTSIDE
ip address 172.16.235.2 255.255.255.0 standby 172.16.235.3
no shutdown#Interface g0/3
nameif INSIDE
ip address 192.168.10.1 255.255.255.0 standby 192.168.10.2
no shutdown
route OUTSIDE 0.0.0.0 0.0.0.0 172.16.235.1

Configure ASAv2

interface redundant 1
member-interface g0/0
member-interface g0/1
no shutdown
interface G0/0
no shutdown
interface G0/1
no shutdown
failover lan interface redundant 1 (This is the interface used for the failover link)
failover interface failover redundant 1 (‘failover’ = the name I gave the failover interface redundant 1)
failover interface ip failover 10.0.0.1 255.255.255.0 standby 10.0.0.2
failover key cisco (Key needs to match on both ASA’s)
failover (Enables failover)
write memory

Additional Configurations on ASAv1 (Optional)

prompt hostname state priority (Changes he command prompt to show which device is Active and which is Standby)
policy-map global_policy
class inspection_default
inspect ICMP (This command and the above two commands will allow ICMP to be inspected in the global policy)
Please watch the configuration video below for a better understanding.
 

 

#ASAActiveStandbyFailover #CiscoASAFailover #asa #ASAvFailover #ASAFailover #asav
Kelvin Charles - Network and Cyber Security Professional.

Popular Posts

Capturing EAPOL and RADIUS Using Wireshark

-
Image
In this article we are going to take a look at how to capture Extensible Authentication Protocol Over LAN (EAPOL) and Remote Authentication Dial-In User Service (RADIUS) packets using Wireshark. This article can be useful for troubleshooting 802.1x within your environment and can also be used for learning purposes. The following topology has been used to gather the required output for this article. Note: This article will only cover the switch configurations that are required to gather EAPOL and RADIUS configuration. Overview of the Topology The supplicant is configured to perform 802.1x using EAP-TLS as the authentication method The user certificate on the supplicant will be used for authentication The supplicant has Wireshark installed Cisco ISE is used for authentication and authorisation The supplicant is assigned to VLAN 10 upon authentication and all other endpoint ports are assigned to VLAN 99 Sniffer device is running Wireshark in order to capture RADIUS flows via SPAN 802.1x
Read more

Configuring Cisco Smart License Software

-
In this article, I would like to demonstrate how to configure Cisco Smart Licensing on the virtual Cisco Adaptive Security Appliance (ASAv). This post assumes that readers already have access to there own Smart Account and would like to know the process of applying licenses. Step 1: Generate ID Token Sign into your Cisco Software Portal: software.cisco.com and navigate to “Smart Software Licensing” You will now need to create an ID token for your device, this is required for communication between the device and the licensing authority. Follow the steps below to create a new token. Click Inventory >>> General >>> New Token and select your preferred options and enter a description for your token. Once you are happy with your token settings click Create Token . You should now have a token created which can be copied over to the device you wish to license. All commands and output from this point will be related to the ASA so please seek out further advice if you wish
Read more

Cisco :: FXOS Authentication Using TACACS

-
In this article, I will describe how to enable authentication and authorization for Firepower eXtensible Operating System (FXOS) devices. The use case presented in this document illustrates how Cisco Identity Services Engine (ISE) can be utilised with attribute-value pairs (AV-Pairs) to authenticate and authorize users accessing the Firepower Chassis Manager (FCM) or FXOS platforms via TACACS+. At the time of writing this post, I found that limited documentation existed and of that documentation that did exist, the examples given weren’t as straightforward. In an effort to make this process easier for my colleagues and customers to understand I have put together the following instructions based on a previous use case given to me. Extracts of this document have been taken from a wider document I am currently creating. I will update this article with the complete document when it has been finalized. Requirements A ‘Device Administration’ license is required in order to use TACACS+ with
Read more

Configuring Remote Access VPN on Firepower

-
Image
In this article we are going to take a look at how to configure remote access VPN's on Firepower devices. This demonstration is based on the following lab environment: Cisco Virtual Firepower Management Center Cisco Virtual Firepower Threat Defense Cisco ISE 2.6 Windows host with AnyConnect VPN Windows Server 2019 (CA Server) All Firepower devices are running version 6.5 Note: ISE is used for authentication and authorization in the following lab however the configuration elements of ISE are out of scope for this demonstration. Generate a CSR for Remote Access VPN's Those accessing your network remotely need to trust the service you're running. Without the correct trust users could face issues connecting via VPN. With access to the FMC navigate to Objects > Object Management > PKI > Cert Enrollment Assuming you are opting for manual enrollment, select 'Manual' in Enrollment Type and copy the CA Certificate BASE-64 into the field. Now select the 'Certifi
Read more

Kali Linux :: CAM Table Overflow Attack Demonstration

-
Image
As part of my on-going studying for the CCNA Security 210 – 260 certification I have been exploring different types of network attacks, one of which is CAM table overflow attacks. In this article I would like to share what I have learnt and provide a demonstration of the attack carried out in a lab environment. To understand my demonstration, you first need to understand how a CAM table overflow attack works and what happens as a result of the attack.   Switches build Content Addressable Memory (CAM) tables based on mac-addresses and port numbers. When a switch receives a frame it checks the table to see if the source mac-address is already known, if the source mac-address is unknown the switch will add the mac-address to the table along with the port number. The switch then checks the destination layer two frame and if no entry exists the switch broadcasts the frame out of all ports except the port in which the frame was received. Presuming the destination mac-address wants to respond
Read more