https://forum.mikrotik.com/t/6-33-icmpv6-type-134-option-25-recursive-dns-server-in-the-configuration/92800
6.33, ICMPv6 type 134, option (25) Recursive DNS server, in the configuration? - General - MikroTik...
Nov 9, 2015 - Hello, My Routerboard RB2011 seems to be issuing IPv6 router advertisements, type 134, with option (25) Recursive DNS Server (as seen in Wireshark): ICMPv6...
recursive dns servertypeoptionconfigurationgeneral