- Probably wouldn't hurt to set them up, especially if you don't have a static prefix. The good thing is that interfaces can have multiple IPv6 addresses, so they can use both the public address and the ULA.
- SLAAC should always be enough. Make sure you don't block the ICMP6 messages it needs though (I've been bitten by that once, firewalld behaves weirdly around this).
this post was submitted on 11 May 2026
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Disabled. IPv6 is slow af whenever I have it on. As soon as I disable it, my bandwidth goes full speed.
I’m not sure what they were thinking with that technology but it’s dead in the water and we need to find a better protocol. It’s also terribly difficult to memorize. The numbering scheme is worse than the Xbox naming scheme.
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I live in spain so the main ISP is well provided with IPv4 blocks and have zero incentive to deploy IPv6 outside of mobile networks. So the IPv6 deployment here is like 3% and I don't have access to it 🫠
I’m doing slaac and some reservations for devices that just randomly pop new MACs (vms or something, I don’t remember why.
I use aliases for my firewall rules. DNS I don’t really have working.
I have that conf: /etc/sysctl.d/01-ipv6.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
But that falls under your exception. It seems to me that IPv6 causes more problems than it solves.
I mean, you can get rid of NAT and subnet your systems in a logical fashion. That's pretty awesome.
Yes, maybe, but do I want to do that? Everything's going perfectly right now.
You can subnet logically with IPv4.
If you go IPv6 on the internal network you 'win' not having NAT, and exposing all your intrrnal services to the net (which... just why?), but lose the ability to do redundant ISPs/failover/loadbalancing, policy based routing, VPNs... Unless you do IPv6 address translation. Which puts you back to "IPv4+NAT, except more complicated."
IPv6 inside the firewall is more or less entirely pointless.