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Pfsense, Opensense and OpenWRT - what's the deal?

Hiya, just getting into networking and recently completed my Tp-link Omada stack, which I'm very pleased with. Have heard great thing about all three mentioned services above, but struggle to understand which to go for. Do they have different use cases? Is one easier than the other? Which one is recommended to begin with?

34 comments

  • pfSense and OPNsense are firewalls. OpenWRT is router firmware. They're all open source - to varying degrees - and they all have overlapping features and functionality.

    Quick breakdown:

    • OpenWRT: originally developed as a replacement for the firmware on Linksys wireless access points. It has grown into a full Linux-based networking OS with extensible features and broad hardware support. The target devices are still mostly wireless routers/access points and the use cases it services are still mainly about wireless networking.
    • pfSense: Originally a fork of m0n0wall, it's a BSD-based firewall distribution. Designed primarily for firewall use cases, it can be loaded on bare metal or in VMs, but it's generally deployed "upstream" from wireless devices - typically it's the device that all of your network traffic passes through on the way in/out of the LAN. Extensible architecture and a rich ecosystem of plugins means that pfSense can also serve as a caching proxy, load balancer, intrusion detection server and logging host.
    • OPNsense: a fork of pfSense. Almost identical use cases. OPNsense has a more usable/modern UI, but lags slightly in support for new features and plugins.

    So the question of pfSense or OPNsense is either/or - you'd typically pick one or the other. Note that I'm staying away from the political comments that will invariably come up around this comparison. It's enough to know that both have commercial offerings in addition to their open source versions and people have strong opinions one way or the other.

    Either one of either pfSense or OPNsense in conjunction with OpenWRT is common, with OpenWRT on the wireless devices and pfSense/OPNsense at the egress to WAN. In your case, Omada already does what OpenWRT would do - along with some very limited versions of what you could do with pfSense or OPNsense.

    It's worth noting that folks often deploy these three open source tools as a method to regain control rather than using a third party cloud based solution like Omada. No judgement, just saying that Omada is the polar opposite of the 'selfhosted' esthetic.

    • Just fyi; I am using the Omada system without using the cloud option, it is also selfhostable :) But thanks for the info/writeup!

      • You are using the cloud though. They control it not you. If they push a bad update or decide to start selling your data there is nothing you can do

  • They all offer more or less the same network services with different UIs.

    OpenWRT is specifically designed to work as a lightweight system running on consumer-grade routers. If you want this, you'll have to check the website's Table Of Hardware to determine if your hardware is compatible.

    OPNsense and pfSense are general-purpose FreeBSD-based operating systems that you can run on discrete computers or in VMs that act as network gateways. All three are free/gratis, but you have to make an account and go through the store page to download pfSense.

    I personally use OPNsense in a VM.

    • OpenWRT is a iot operating system. It can run anywhere and everywhere. You can totally run it on enterprise gear and x86 machines. It can work as a firewall or a operating system for a light bulb. It also has the advantage of being very extensible and you can build custom images that have only the stuff you need.

      The downside is that even though the wiki is fairly good it still requires a good amount of networking knowledge to use. It isn't bad and it ships with sain defaults but if you want to get advanced you need to know what you are doing.

      It also lacks a mechanism for automatic security patching. You need to manually update it which is easier with attended upgrades but it still requires button pushing and downtime.

    • Thanks for the info :)

  • Lots of comments already mentioning the differences. I have tried these, including the mentioned ipfire, and decided on the end to use opnsense plus openwrt on two different devices.

    I chose opnsense at the time many years ago because it supported wireguard out of the box, where as pfsense required some weird install process I didn't want to deal with. Plus I liked the UI to opnsense more.

    My moden has been literally replaced by my firewall so I have the ONT connected to it and then use it to do all the heavy lifting for... Well, firewall stuff. It connects to a VPN so my entire network routes through the VPN. Then my openwrt device is connected to that. It also handles firewall stuff, but more at an internal level (keeping network devices only permitted to communicate with devices I say are okay, blocking internet access, etc) and also hosts my nginx setup to route to various servers.

    While I could do everything on one machine with opnsense, I've got a particular setup that allows me to have multiple devices at the firewall level, truly isolated from the rest of my internal network (for a couple of internet open port services). And it gives me peace of mind that if someone found a zero day in opnsense, I'm not totally screwed unless they also got one in openwrt.

    To answer "which is better to begin with", I personally find opnsense way more flexible and robust than the other 2 options. Has a lot more capabilities and upgrading is super easy without requiring jumping through weird hoops and such like openwrt does.

34 comments