2/20/2024 0 Comments Gns3 asa activeactive failoverI usually assign DHCP address’ from the ASA when setting up guest wireless this way, but you can do it from the LAN controller or the AP itself. One thing I would mention is make sure your switch has DTP turned off for unused ports, don’t think I need to explain that one do I?ĪSA1(config-if)#ip address 192.168.1.254 255.255.255.0ĪSA1(config-if)#no forward interface vlan 1ĪSA1(config)#global (outside) 1 interfaceĪSA1(config)#nat (Guest) 1 0.0.0.0 0.0.0.0 So you’ve already setup your AP either its an autonomous AP or you have this connected to your LAN controller, the reason you need to trunk your AP to the switch is so you can have multiple SSID’s each with its own VLAN assigned. I can hear you ask why there are 2 connections to the firewall well one is your inside corporate interface and the second is your guest wireless interface. First of all you need to know that a VLAN is associated to layer 2 of the OSI model, and when your clients connect to the Guest Wireless VLAN they will be able to route out the VLAN via the ASA firewall. Setting up your ASA for guest wireless is easy, you only need the base licence to do this. This was one of my favourite blogs to write because the with the Cisco ASA everything just “works” Logging from-address recipient-address x.x.x.x You can have the ASA alert you when a failover has taken place by setting up email alerts. To manually failover the devices you can use the command “ no failover active” on the active firewall or from the standby you can use ” failover active” note that when the primary unit recovers from a failure it does not automatically assume the active role. The command “ show failover” will provide you with all the necessary information you require should you need to troubleshoot or confirm your configuration is working as expected. The primary firewall prompt will be ASA1/pri/act#.Īfter this point you only need to make changes to the primary unit and any changes to the configuration and “ write memory” you do on the primary will also be replicated to the standby unit. You will notice the prompt changes to ASA1/sec/stby# we use the command “ prompt hostname priority state” for this purpose, so we can be sure which firewall is which. The firewalls will begin to synchronise their configurations, the primary ASA will send over the configuration to the secondary. This is the absolute minimum you require to get the secondary firewall up and running, again be sure to use “ no shutdown” on any interfaces you need.Īfter you enter the commands you will see the message “ detected and active mate” this will confirm the 2 firewalls can see each other. Once that is complete, you can now configure the secondary firewall, you can use the command “ clear config all” on the secondary firewall to clear all config before you input the commands below. Be sure to use “ no shutdown” on any interfaces you decide to use. On ASA 1 use a console or SSH session and input the following commands. You will need to decide beforehand which address space you will use for your failover interfaces, and your standby IP’s must be another useable IP within your primary IP subnet. We will just use the basic config of the firewall, in my setup i have an IPsec tunnel between my ASA and R3, I used this to confirm that IPsec tunnel failover was working as expected. The first thing you should know is you only need to set up 1 individual firewall, so my recommendation would be to get a firewall fully functional with all the configuration necessary, then the secondary firewall only needs a few commands before taking an entire copy of the primary firewall’s config, and becoming a standby firewall.īefore we begin lets take a look at the diagram, I used GNS3 but if you require to do this in real-life you would use crossover cables between the failover interfaces.This diagram depicts a single point of failure as the LAN switch but this is not the point of the blog, You would have more than one switch within your core design. From version 8.4 routing information is also replicated. You can use stateful failover to resume IPsec sessions, NAT xlate, TCP, UDP, ARP etc. This blog will cover setting up 2 Cisco ASA firewall’s Active / Standby, so if one of the firewalls has a power issue or hardware failure, the standby firewall will wait a set amount of time before taking over from the failed device and resuming the traffic as if nothing happened.
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