Yes. With IPv6 there are still stateful firewalls on routers. An app/service still generally needs to do firewall hole punching via UPnP or PCP. The main thing that goes away is the rigamarole of figuring out the public IP address:
* https://tailscale.com/blog/how-nat-traversal-works/
With my Asus RT-AC68U I can ping my IPv6 address:
* https://www.subnetonline.com/pages/ipv6-network-tools/online...
But cannot connect to SSH from the Internet (but localhost works), or port 80 (if I launch 'nc -6 -l 80'):
Firewalls do not stop working with IPv6.
Yes. With IPv6 there are still stateful firewalls on routers. An app/service still generally needs to do firewall hole punching via UPnP or PCP. The main thing that goes away is the rigamarole of figuring out the public IP address:
* https://tailscale.com/blog/how-nat-traversal-works/
With my Asus RT-AC68U I can ping my IPv6 address:
* https://www.subnetonline.com/pages/ipv6-network-tools/online...
But cannot connect to SSH from the Internet (but localhost works), or port 80 (if I launch 'nc -6 -l 80'):
* https://www.subnetonline.com/pages/ipv6-network-tools/online...
Firewalls do not stop working with IPv6.