The question above for the most part, been reading up on it. Also want to it for learning purposes.
Dual-Stack is usually no problem, but going IPv6-only is a pain, because a suprising amount of services are v4 only. Even NAT64/DNS64 doesn’t help everywhere.
Definitely dual stack if you do. The real benefit of IPv6 is that, supposedly, each of your internal devices can have its own address and be directly accessible, but I don’t think anyone actually wants all of their internal network exposed to the internet. My ISP provides IPv6, but only a single /128 address, so everything still goes through NAT.
Setting it up was definitely a learning process - SLAAC vs DHCP; isc’s dhcpd uses all different keywords for 6 vs 4, you have to run 6 and 4 in separate processes. It’s definitely doable, but I think the main benefit is the knowledge you gain.
And the biggest disadvantage of IPv6 is that each of your internal devices has its own address and can be directly accessible from outside. So you need to completely rethink how you do security.
And can be identified/tracked individually by outside entities. In IPv4, a website sees both my device and my kid’s device as the same IP. In IPv6 they’re different so this just provides more ways for them to track you.
That’s the reason for rcf 4941. It randomises the host part of your IPv6 address.
Because devices in your LAN will all be accessible from the internet with IPv6, you need to firewall every device.
It becomes more of a problem for IoT devices which you can’t really control. If you can, disable ipv6 for those.
It’s not necessary to firewall every device. Just like how your router can handle NAT, it should be able to handle stateful firewall too.
Mine blocks all incoming connections by default. I can add (IP, port range) entries to the whitelist if I need to host a service, it’s not really different to NAT port forwarding rules.
The argument for IPv6 that there could be a unique address for 200 devices for every person living on the planet was much more compelling when network security was a more simple space.
