– Sorry for the watermarking some sackwasher has been copying my articles and is selling them behind a paywall. If they aren’t discrepancies can occur in the xml configuration files resulting in weird errors. – The PfSense installations need to be on the exact same version. If unsure pick a random high number, like 178 or 49, instead of beginning at 1. – VHIDs are important – if you’re in a network using VHIDs make sure they are not in use or you will end up confused. It’s a starting point but in my opinion the article is in places ambiguous and overly complicated. If someone will sponsor me more connections I’ll be happy to document multi-WAN HA here ) Notes I will be describing mono-WAN HA here, so just one internet connection. – internet connectivity redundancy (fall-back internet connections).

– failover in case of a hardware problem Most use cases describe one of these purposes: Since there’s no such thing as redundancy with only one node you will need at least two.

– settings synchronisation (XMLRPC sync).ĬARP requires at least three public IP addresses: one virtual address for outgoing traffic and one for each node (=PfSense router). – firewall state synchronisation (pfsync) – Common Address Redundancy Protocol (CARP), a protocol that allows for network devices to share virtual IP addresses HA is a combination of three different techniques: If you’re really euphoric about it there’s also the PayPal donate button on the right ) It won’t make me rich but it will tell me someone appreciated my work. If you find this article useful feel free to click some of the ads on this page. Instantly in this case being one or two seconds, without firewall states being broken, so your file will just continue downloading and your video will continue streaming. High Availability (HA) in PfSense comes down to hardware redundancy, essentially having a hot spare instantly taking over a router that becomes unavailable, aka failover.

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