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this post was submitted on 26 Jun 2024
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Unpopular Opinion
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I posted this elsewhere a few days ago. I don't think IPv6 can do what I require of a basic home network, let alone a large enterprise...
I gave it a really good shot at implementing this past week. I spent 3 days getting up to speed, reading loads and trying various different things. But I am now back to IPv4 only because I just can't get IPv6 to do what I want and no amount of searching has made me think what I want to do is even possible.
Some background about the IPv4 network I run at home: I run opnsense on a Proxmox server. I have a few services publicly available using port forwarding. I run several VLANs for IoT, VoIP, Cameras etc. I use a bunch of firewall rules that are specific client devices on the network. So for example I have a rule that blocks youtube from the kids tablets and the TV. I have a special rule around DNS for the wife as she doesn't want to use the pihole blocking features. These rules are made possible because the DHCP server is set to give them a fixed IP and I can create a firewall alias and rule based on that.
None of these things on my existing network are particularly difficult to configure, they run really well.
What I want from IPv6 is:
What I've tried:
Additional: I don't think I have a problem with "thinking about it all wrong for IPv6". I may have a skill issue, hence this question.
As far as I can tell to achieve requirement 1) you must use SLAAC. SLAAC without privacy extensions doesn't allow for 6).
Changes to external ISP prefix assignment impacts MY INTERNAL NETWORK (this just seems insane). And as far as I can tell there's no easy way around this, especially if I have static addresses configured for servers which would (if using SLAAC) have to be manually configured.
I can't see how DNS would be updated either, either Unbound running on Opnsense, or to the pihole. If I go for SLAAC with privacy extensions and I keep paying for a static IP (v4 & v6) to my ISP then I can't implement any firewall rules for specific devices as devices will change their IP regularly. And its even worse if I don't pay for a static IPv6 prefix.
I don't think anything I'm trying to do is particularly strange or unusual but 26 years after its introduction I don't see that IPv6 can meet these requirements. And one of the leading firewall routers, especially in the homelab doesn't have answers to these questions either.
Can you suggest a way to meet all 6 requirements I have with IPv6?
But why? What benefit does ipv6 bring to a home network that ipv4 doesn't have?
As you said everything is already setup well with ipv4 so why change it?
I'd read a lot if people saying how good and easy IPv6 was and I thought I'd use it as an opportunity to learn about it.
But turns out the only thing it does is give everything a public IP because the creators were so obsessed about getting rid of NAT. Nothing else seems to have been thought through.
There are IETF mailing list threads where no one has a clue as to why it's not being adopted, including one where they discover their own RFC is inconsistent with itself and that's the reason why IPv4 is given higher priority than fd00::/8. You can tell how half baked it is when you look at the number of revisions, additional protocols that have been added decades after it was initially proposed.
Their hatred of NAT seems to drive everything, but for most home and business users NAT is a great feature that drives so much simplicity by keeping you private networks private and independent of the rest of the internet.
Yeah, NAT is great for home users. Unless your ISP is also using (carrier grade) NAT. Then you're fucked by double NAT and have to call your ISP every time you want to forward a port.
Obviously with IPv6 there's be no need for CGNAT. But NAT within each household or business is useful.