Turris Omnia is providing different DNS server options simultaneously in both RA and DHCPv6 (Bug?)


Turris Omnia is providing DNS server options within both router announcements and DHCPv6.
The DNS server option in the RA is my upstream ISP.
The DHCPv6 DNS option is the Turris Omnia itself.

Is there a way to disable the DNS option being sent out in the RA, or to replace the DNS server option sent in the RA to conain only the resolver in the Turris Omnia?

The WAN6 interface is according to LuCi configured to ignore the upstream DNS server option.

	option ifname '@wan'
	option proto 'dhcpv6'
	option reqaddress 'try'
	option reqprefix 'auto'
	option peerdns '0'
	option noserverunicast '1'

Yeah, this has always bugged me too. When I get a chance will see if I can figure it out…

Seems like I was wrong regarding the RA and DHCPv6 DNS options provided by the Omnia.

When looking further into the addresses provided, I see that the DHCPv6 DNS option is the unique local address of the LAN interface on the Omnia, and the RA RDNSS option is the global unicast address of the LAN interface selected from the prefix provided by my ISP.

My bad. :slight_smile:

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