How does IPv6 negotiation over IPv4's PPPoE work?
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That's another challenge, do load balancing on IPv6 where router manages it and chooses what route connections will use.
If that works and I'm able in example to rule a given destination to always use a given WAN, it must work.
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What if you use a remote receiver?
From experience I've learned that DDNS in pfSense, or any other appliance only works when you're "gentle" to it, meaning one hostname. As soon as you add additional hostnames, domains it'll fail to update them so I got a VPS and installed pfSense on it for the static IP they give you, starting at USD5/mo, sometimes less, it's the cheapest static address you can rent.
I actually use it for the GIF to HurricaneElectric and tunnel both IPv4 and IPv6 to the local pfSense, I have about the same latency in local IPv4 as in tunneled IPv4 and (double-) tunneled IPv6.
But where I'm going with this is:
I also use my remote instance's public address as the monitor IP for the local WAN gateway. And since I can contact the remote instance locally through the tunnel, I get statistics on it with any tool, like from which IP a tunnel is has been brought up--which I know would only be mine. "Loopback" Stats. This data can be sent to a syslog server or queried through SNMP. You can query all sorts of data, I check consumption because the VPS has a data cap, I'm used to not having it because of my ISP so this is really handy, you can set it to notify you through a bot on Telegram, Matrix, classic email or a buttload of other integrations it has:
The first one is LibreNMS, completely free, does SNMP and syslog, you don't need scripts or databases because it's meant to keep historic data, it's all there as long as you feed it. The second one is VMware's vRealize Log Insight, also free (*with purchase) it only does syslog but it's very comprehensive, king of syslogs, it can proxy the syslog to yet more servers and has this thing called agents, custom-made-on-site apps preconfigured to send data to it and reconfigurable remotely. It's very cool.
LibreNMS is like a 2core/2G/20G VM if I'm not mistaken, Log Insight is much hungrier but you can tweak it before first starting it, I discovered. Both need fast disks.
