@stephenw10 said in Can't Save LAN Interface Settings - IPV6 Configuration Type set to None:
It's possible to get into a chicken/egg situation with the IPv6 DHCPv6/RA server. It can only run on an interface configured with IPv6 so if it's enabled you can't set LAN v6 type to none. However if that does somehow get set to none the tab where you would disable those services is hidden.
Hence you have enable v6 on LAN in order to disable it!
It used to be possible to hit this if you set the interface at the CLI but that should be fixed:
https://redmine.pfsense.org/issues/11609
Steve
Thank you for posting this where I finally found a solution via search.
I had the exact same issue as the OP, discovered when going through each and every page to verify I did not have an error somewhere in my settings. This issue came up and it has been driving me crazy. Long ago I had ipV6 enabled but abandoned it since I don't see that I need it at this time.
Your solution guided me, with much effort (I had to find an ipV6 addr to enter to enable) then I found on the RA page of dhcpV6 server the 'enabled' toggle for RA.
This has been a long, frustrating journey and thanks again for your comment.