If you want to run your own recursive DNS server, you must find upstream servers that are authoritative for the dn42 zones.
You may use some servers listed in the table of anycast servers, or just use 172.22.119.160 and 172.22.119.163 (ns{1,2}.fritz.dn42).
Configuration
Unbound
Configuration for unbound.conf
server:
local-zone: "22.172.in-addr.arpa." nodefault
local-zone: "23.172.in-addr.arpa." nodefault
stub-zone:
name: "dn42"
stub-prime: yes
stub-addr: 172.22.119.160
stub-addr: 172.22.119.163
stub-zone:
name: "22.172.in-addr.arpa"
stub-prime: yes
stub-addr: 172.22.119.160
stub-addr: 172.22.119.163
stub-zone:
name: "23.172.in-addr.arpa"
stub-prime: yes
stub-addr: 172.22.119.160
stub-addr: 172.22.119.163
Unbound with root-hints
Alternatively you can put dn42 root servers in the root-hints file for recursive resolving.
# /etc/unbound/unbound.conf.d/dn42.conf
server:
# DNSSEC validation will fail
val-permissive-mode: yes
# recursive queries for everyone
access-control: 0.0.0.0/0 allow
# dn42 root servers
root-hints: /etc/unbound/dn42.hints
# enable IPv6
do-ip6: yes
# allow reverse lookup of rfc1918 space, which includes the DN42 address space
unblock-lan-zones: yes
insecure-lan-zones: yes
remote-control:
control-enable: no
The /etc/unbound/dn42.hints file:
. NS a.root-servers.dn42.
a.root-servers.dn42. 3600000 A 172.22.177.6
. NS m.root-servers.dn42.
m.root-servers.dn42. 3600000 A 172.23.67.67
. NS t.root-servers.dn42.
t.root-servers.dn42. 3600000 A 172.22.102.141
. NS x.root-servers.dn42.
x.root-servers.dn42. 3600000 A 172.22.141.1