Forwarder setup
Configuration of common resolver softwares to forward DNS queries for .dn42 (and reverse DNS) IPv4 and IPv6 anycast services.
You can use any *.recursive-servers.dn42 (where * is a letter) for resolving .dn42 domains. The current list is available at the DN42 registry or through querying SRV records of recursive-servers.dn42:
drill -D SRV _dns._udp.recursive-servers.dn42. @172.20.0.53Two independent anycast services are also provided:
| Name | IPv4 | IPv6 |
|---|---|---|
| a0.recursive-servers.dn42 | 172.20.0.53 | fd42:d42:d42:54::1 |
| a3.recursive-servers.dn42 | 172.23.0.53 | fd42:d42:d42:53::1 |
All the examples here list 172.20.0.53/fd42:d42:d42:54::1, but users are encouraged to configure multiple services from *.recursive-servers.dn42 for redundancy.
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 { 172.20.0.53; fd42:d42:d42:54::1; };
};
zone "20.172.in-addr.arpa" {
type forward;
forwarders { 172.20.0.53; fd42:d42:d42:54::1; };
};
zone "21.172.in-addr.arpa" {
type forward;
forwarders { 172.20.0.53; fd42:d42:d42:54::1; };
};
zone "22.172.in-addr.arpa" {
type forward;
forwarders { 172.20.0.53; fd42:d42:d42:54::1; };
};
zone "23.172.in-addr.arpa" {
type forward;
forwarders { 172.20.0.53; fd42:d42:d42:54::1; };
};
zone "d.f.ip6.arpa" {
type forward;
forwarders { 172.20.0.53; fd42:d42:d42:54::1; };
};Note: With DNSSEC enabled, bind might refuse to accept query results from the dn42 zone: validating dn42/SOA: got insecure response; parent indicates it should be secure.
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 '/dn42/172.20.0.53'
list server '/20.172.in-addr.arpa/172.20.0.53'
list server '/21.172.in-addr.arpa/172.20.0.53'
list server '/22.172.in-addr.arpa/172.20.0.53'
list server '/23.172.in-addr.arpa/172.20.0.53'
list server '/d.f.ip6.arpa/fd42:d42:d42:54::1'
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=/dn42/172.20.0.53
server=/20.172.in-addr.arpa/172.20.0.53
server=/21.172.in-addr.arpa/172.20.0.53
server=/22.172.in-addr.arpa/172.20.0.53
server=/23.172.in-addr.arpa/172.20.0.53
server=/d.f.ip6.arpa/fd42:d42:d42:54::1dnsmasq.conf.
PowerDNS recursor
Add this to /etc/powerdns/recursor.conf (at least in Debian and CentOS), the forward-zone-recurse is one line.
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=172.20.0.53,hack=172.20.0.53,ffhh=172.20.0.53,ffac=172.20.0.53,020=172.20.0.53,adm=172.20.0.53,ffa=172.20.0.53,ffhb=172.20.0.53,ffc=172.20.0.53,ffda=172.20.0.53,ffdh=172.20.0.53,ff3l=172.20.0.53,fffl=172.20.0.53,ffffm=172.20.0.53,fffr=172.20.0.53,fffd=172.20.0.53,ffgl=172.20.0.53,fflln=172.20.0.53,ffbcd=172.20.0.53,ffbgl=172.20.0.53,ffgoe=172.20.0.53,ffgt=172.20.0.53,ffh=172.20.0.53,helgo=172.20.0.53,ffhef=172.20.0.53,ffj=172.20.0.53,ffka=172.20.0.53,ffki=172.20.0.53,ffhl=172.20.0.53,fflux=172.20.0.53,ffms=172.20.0.53,mueritz=172.20.0.53,ffnord=172.20.0.53,ffnw=172.20.0.53,ffoh=172.20.0.53,ffpb=172.20.0.53,ffpi=172.20.0.53,ffrade=172.20.0.53,ffrgb=172.20.0.53,ffrg=172.20.0.53,rzl=172.20.0.53,ffsaar=172.20.0.53,fftr=172.20.0.53,fftdf=172.20.0.53,ffwk=172.20.0.53,ffgro=172.20.0.53,ffwk=172.20.0.53,ffwp=172.20.0.53,ffw=172.20.0.53,20.172.in-addr.arpa=172.20.0.53,22.172.in-addr.arpa=172.20.0.53,23.172.in-addr.arpa=172.20.0.53,31.172.in-addr.arpa=172.20.0.53,c.f.ip6.arpa=172.20.0.53MaraDNS
Put this in your mararc:
ipv4_alias["dn42_root"] = "172.20.0.53"
root_servers["dn42."] = "dn42_root"
root_servers["20.172.in-addr.arpa."] = "dn42_root"
root_servers["21.172.in-addr.arpa."] = "dn42_root"
root_servers["22.172.in-addr.arpa."] = "dn42_root"
root_servers["23.172.in-addr.arpa."] = "dn42_root"Unbound
Make sure to disable auto-trust-anchor-file and manually configure trust-anchor-file to
point to a file with DNSKEY records for dn42.
server:
local-zone: "20.172.in-addr.arpa." nodefault
local-zone: "21.172.in-addr.arpa." nodefault
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: fd42:d42:d42:54::1
forward-addr: 172.20.0.53
forward-zone:
name: "20.172.in-addr.arpa"
forward-addr: fd42:d42:d42:54::1
forward-addr: 172.20.0.53
forward-zone:
name: "21.172.in-addr.arpa"
forward-addr: fd42:d42:d42:54::1
forward-addr: 172.20.0.53
forward-zone:
name: "22.172.in-addr.arpa"
forward-addr: fd42:d42:d42:54::1
forward-addr: 172.20.0.53
forward-zone:
name: "23.172.in-addr.arpa"
forward-addr: fd42:d42:d42:54::1
forward-addr: 172.20.0.53
forward-zone:
name: "d.f.ip6.arpa"
forward-addr: fd42:d42:d42:54::1
forward-addr: 172.20.0.53JunOS (SRX 12.1X46)
Should also work in 12.1X44 and 12.1X45. After making the changes below you may need to run:
restart named-servicesystem {
services {
dns {
dns-proxy {
interface {
vlan.0;
}
default-domain dn42 {
forwarders {
172.20.0.53;
fd42:d42:d42:54::1;
}
}
default-domain 20.172.in-addr.arpa {
forwarders {
172.20.0.53;
fd42:d42:d42:54::1;
}
}
default-domain 21.172.in-addr.arpa {
forwarders {
172.20.0.53;
fd42:d42:d42:54::1;
}
}
default-domain 22.172.in-addr.arpa {
forwarders {
172.20.0.53;
fd42:d42:d42:54::1;
}
}
default-domain 23.172.in-addr.arpa {
forwarders {
172.20.0.53;
fd42:d42:d42:54::1;
}
}
}
}
}
}MS DNS
Add a "Conditional Forward" (de: "Bedingte Weiterleitung") for each of "dn42", "20.172.in-addr.arpa", "21.172.in-addr.arpa", "22.172.in-addr.arpa", "23.172.in-addr.arpa" using 172.20.0.53 as forwarder. Ignore the error message that the server is not authoritative.