forwarder setup

BIND

If you already run a local DNS server, you can tell it to query the dn42 anycast servers for the relevant domains by adding the following to /etc/bind/named.conf.local

zone "dn42" {
  type forward;
  forwarders { 172.22.0.53; };
};
zone "22.172.in-addr.arpa" {
  type forward;
  forwarders { 172.22.0.53; };
};
zone "23.172.in-addr.arpa" {
  type forward;
  forwarders { 172.22.0.53; };
};

dnsmasq

If you are running dnsmasq under openwrt, you just have to add

config dnsmasq
    option local            '/dn42/22.172.in-addr.arpa/172.22.0.53'

to /etc/config/dhcp and run /etc/init.d/dnsmasq restart. After that you are able to resolve .dn42 with the anycast DNS-Server, while your normal requests go to your standard DNS-resolver.

for normal dnsmasq use

server=/dn42/172.22.0.53
server=/22.172.in-addr.arpa/172.22.0.53

in dnsmasq.conf

PowerDNS recursor

Add this to /etc/powerdns/recursor.conf (at least in Debian)

dont-query=127.0.0.0/8, 10.0.0.0/8, 192.168.0.0/16, ::1/128, fe80::/10
forward-zones= dn42=172.22.0.53,22.172.in-addr.arpa=172.22.0.53,23.172.in-addr.arpa=172.22.0.53

MaraDNS

Put this in your mararc:

ipv4_alias["dn42_root"] = "172.22.0.53"
root_servers["dn42."] = "dn42_root"
root_servers["22.172.in-addr.arpa."] = "dn42_root"
root_servers["23.172.in-addr.arpa."] = "dn42_root"

Unbound

unbound.conf for 172.22.0.53

server:
        interface: 172.22.0.53@53
        access-control: 0.0.0.0/0 allow
        access-control: ::0/0 allow
        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: 172.22.119.139
        stub-addr: 172.22.119.129

stub-zone:
        name: "22.172.in-addr.arpa"
	stub-prime: yes
        stub-addr: 172.22.119.139
        stub-addr: 172.22.119.129

stub-zone:
        name: "23.172.in-addr.arpa"
	stub-prime: yes
        stub-addr: 172.22.119.139
        stub-addr: 172.22.119.129

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