Request Help: ipv6 domain name in setting page: I changed

[whatsinaname999]

Dear All, please hare one settings.

I was playing with settlings, and now got into issues.

I went into
Network -> LAN -> IPV6 Configration.

I think one field I changed -> Domain Name

Can you please share the default correct value?
Also please tell me anything else I need to change?

I dont remember what all I changed.