Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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IPv6 doesn't support NAT... Or am I woefully out of date.
But your home router will just firewall like it does already but you don't have NAT as a simple fall back for "security". It does make running internal services much easier as you no long need to port forward. So you can run two webservers on port 80 and they be bother allowed inbound without doing horrible load balance or NAT translation.
Ipv6 doesn't need NAT
The router does have a firewall but it blocks everything inbound by default. Some routers (at least mine) do not offer the granularity to filter traffic for certain devices (no NAT either). It's either allow all in or nothing.
When you enable IPv6 and switch off the firewall (since you can't host anything otherwise), every device becomes exposed to the internet.
Then unless the devices have a firewall themselves, all is exposed. Not just the web services, ssh and the rest as well.
There was a way around it however but not something everyone will be able to do with their home router. I had to ssh to the router using ISP admin credentials leaked on the internet, then create a file in init.d that loads a custom iptables file with the firewall rules I needed for IPv6. NAT for IPv6 however was not supported by the kennel used for my router.
IPv6 has NPTv6, which allows you to translate from one prefix into another.
Useful if you've got dual WAN, and can't advertise your own addressing via the ISP. You can use NPTv6 to translate between your local prefix and the public prefixes. But NPTv6 is completely stateless. It's literally a 1:1 mapping between the prefixes.