Forwarder setup

Configuration of common resolver softwares, to forward DNS queries for .dn42 (and reverse DNS) to 172.22.0.53.

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 boguspriv '0'
        option rebind_protection '1'
        list rebind_domain 'dn42'
        list server '/dn42/172.22.0.53'
        list server '/22.172.in-addr.arpa/172.22.0.53'
        list server '/23.172.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.

Attention: If you go with the default config you'll have to disable "boguspriv" in the first dnsmasq config section.

For normal dnsmasq use

server=/dn42/172.22.0.53
server=/22.172.in-addr.arpa/172.22.0.53
server=/23.172.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-recurse=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 forwarding requests to 172.22.0.53.

server:
      domain-insecure: "dn42"
      local-zone: "22.172.in-addr.arpa." nodefault
      local-zone: "23.172.in-addr.arpa." nodefault
      local-zone: "d.f.ip6.arpa." nodefault

forward-zone: 
      name: "dn42"
      forward-addr: 172.22.0.53

forward-zone: 
      name: "22.172.in-addr.arpa"
      forward-addr: 172.22.0.53

forward-zone: 
      name: "23.172.in-addr.arpa"
      forward-addr: 172.22.0.53

forward-zone:
      name: "d.f.ip6.arpa"
      forward-addr: 172.22.0.53

JunOS (SRX 12.1X46)

Should also work in 12.1X44 and 12.1X45. After making the changes below you may need to run:

restart named-service

Config (vlan.0 is presumed to be your LAN/Trust interface)

system {
   services {
      dns {
         dns-proxy {
            interface {
               vlan.0;
            }
	    default-domain dn42 {
	       forwarders {
	          172.22.0.53;
	       }
	    }
	    default-domain 22.172.in-addr.arpa {
               forwarders {
                  172.22.0.53;
               }
            }                       
            default-domain 23.172.in-addr.arpa {
               forwarders {
                  172.22.0.53;
               }
            }
	 }
      }
   }
}