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DNS, glue records and TTL

Posted by jpluimers on 2017/12/06

If I ever need to read why, here are the explanatory links:

TL;DR:

  • You need glue records for your domains if the nameserver is in the same TLD as your domain is (more explanation in the above links).
  • Your domain registrar allows you to change both your DNS servers and the glue at the TLD servers.
  • Glue records have a TTL at the TLD of 48 hours so changing them takes some waiting.
  • This is how you query the glue records so you can verify what’s setup at your DNS servers matches the ones at the TLD servers (in the below examples, replace google.com by your domain name).

dig +trace +additional google.com

 

Notes:

At the time of writing the dig output is this:

# dig +trace +additional example.org

; <<>> DiG 9.8.3-P1 <<>> +trace +additional example.org
;; global options: +cmd
.           86333   IN  NS  a.root-servers.net.
.           86333   IN  NS  k.root-servers.net.
.           86333   IN  NS  f.root-servers.net.
.           86333   IN  NS  c.root-servers.net.
.           86333   IN  NS  g.root-servers.net.
.           86333   IN  NS  m.root-servers.net.
.           86333   IN  NS  j.root-servers.net.
.           86333   IN  NS  i.root-servers.net.
.           86333   IN  NS  b.root-servers.net.
.           86333   IN  NS  h.root-servers.net.
.           86333   IN  NS  d.root-servers.net.
.           86333   IN  NS  e.root-servers.net.
.           86333   IN  NS  l.root-servers.net.
;; Received 228 bytes from 192.168.124.1#53(192.168.124.1) in 34 ms

org.            172800  IN  NS  a0.org.afilias-nst.info.
org.            172800  IN  NS  a2.org.afilias-nst.info.
org.            172800  IN  NS  b0.org.afilias-nst.org.
org.            172800  IN  NS  b2.org.afilias-nst.org.
org.            172800  IN  NS  c0.org.afilias-nst.info.
org.            172800  IN  NS  d0.org.afilias-nst.org.
a0.org.afilias-nst.info. 172800 IN  A   199.19.56.1
a2.org.afilias-nst.info. 172800 IN  A   199.249.112.1
b0.org.afilias-nst.org. 172800  IN  A   199.19.54.1
b2.org.afilias-nst.org. 172800  IN  A   199.249.120.1
c0.org.afilias-nst.info. 172800 IN  A   199.19.53.1
d0.org.afilias-nst.org. 172800  IN  A   199.19.57.1
a0.org.afilias-nst.info. 172800 IN  AAAA    2001:500:e::1
a2.org.afilias-nst.info. 172800 IN  AAAA    2001:500:40::1
b0.org.afilias-nst.org. 172800  IN  AAAA    2001:500:c::1
b2.org.afilias-nst.org. 172800  IN  AAAA    2001:500:48::1
c0.org.afilias-nst.info. 172800 IN  AAAA    2001:500:b::1
d0.org.afilias-nst.org. 172800  IN  AAAA    2001:500:f::1
;; Received 431 bytes from 192.203.230.10#53(192.203.230.10) in 16 ms

example.org.        86400   IN  NS  a.iana-servers.net.
example.org.        86400   IN  NS  b.iana-servers.net.
;; Received 77 bytes from 199.249.112.1#53(199.249.112.1) in 15 ms

example.org.        86400   IN  A   93.184.216.34
example.org.        86400   IN  NS  b.iana-servers.net.
example.org.        86400   IN  NS  a.iana-servers.net.
a.iana-servers.net. 1800    IN  A   199.43.135.53
a.iana-servers.net. 1800    IN  AAAA    2001:500:8f::53
b.iana-servers.net. 1800    IN  A   199.43.133.53
b.iana-servers.net. 1800    IN  AAAA    2001:500:8d::53
;; Received 181 bytes from 199.43.133.53#53(199.43.133.53) in 145 ms

–jeroen

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