jow-:

Use option dns_service 0 to inhibit this behavior. Also see https://git.openwrt.org/?p=project/odhcpd.git;a=blob;f=README;hb=8d8a8cd35137ff0fa11b6be455fdd596a8d7d2e9#l106

brianjmurrell:

That doesn't seem to be working here:

config dhcp 'lan'
option interface 'lan'
option dhcpv6 'disabled'
option ra 'server'
option ra_management '0'
#list dns 'fd31:aeb1:48df::2'
list domain 'example.com'
option prefix_filter 'fc00:0:0:0:0:0:0:0/7'
option ra_preference 'high'
option ra_default '1'
option dns_service 0

config dhcp 'lan1'
option interface 'lan1'
option dhcpv6 'disabled'
option ra 'server'
option ra_management '0'
#list dns 'fd31:aeb1:48df::2'
list domain 'example.com'
option prefix_filter '2001:abc:de:123::/64'
option ra_preference 'medium'
option dns_service 0

Still getting:
Recursive DNS server : fd31:aeb1:48df::1

from rdisc6.

dedeckeh:

Which release are you using to test this ?
This feature is only available from release 21.02 onwards

brianjmurrell:

Which release are you using to test this ?

In the description:

//- Software versions of OpenWrt/LEDE release, packages, etc.
19.07.7//

This feature is only available from release 21.02 onwards

No chance of a backport? Is it too invasive?

So, is 21 the release after 20, which is not even a release yet?

dedeckeh:

Only bugfixes are backported to stable releases; not features

The 21 release is the release currently being prepared

brianjmurrell:

Could I argue that odhcpd advertising itself as a DNS resolver, when it's not, and no ability to disable that is a bug, as it's causing lookup failures on the entire LAN it's servicing? :-)