6.33, ICMPv6 type 134, option (25) Recursive DNS server, in the configuration?

RouterOS General
1

Hello,

My Routerboard RB2011 seems to be issuing IPv6 router advertisements, type 134, with option (25) Recursive DNS Server (as seen in Wireshark):

ICMPv6 Option (Recursive DNS Server 2620:0:ccc::2 2620:0:ccd::2)
Type: Recursive DNS Server (25)
Length: 5 (40 bytes)
Reserved
Lifetime: 900
Recursive DNS Servers: 2620:0:ccc::2 (2620:0:ccc::2)
Recursive DNS Servers: 2620:0:ccd::2 (2620:0:ccd::2)

But this is not currently configured anywhere I can find in the configuration (from ssh console, /export the config.).

At one point the OpenDNS IPv6 servers were configured, but now desire only the IPv4 servers be used (until Cisco/OpenDNS.com fully support IPv6).

Can anyone point me to where this option 25 can be cleared in the config. Or, might the Routerboard be learning this somehow from some device on the local network?

Thanks in advance.

2

if you set up IPv6 address in ‘/ip dns’ and then in ‘/ipv6 nd’ configure to advertise-dns=yes then it will distribute the DNS. Also, if you have set that, then adding DHCP-PD server (even without any other configuration) it will respond to DHCPv6 requests for DNS server IP address.