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PeanutsMonkey
Asked: 2011-07-22 17:23:47 +0800 CST

What is Missing Glue and GLUE mismatch?

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I have come across the terms on several occasions however am unsure what they mean exactly.

domain-name-system

2 Answers

  1. Best Answer

    They refer to DNS GLUE records. Generally, they're used by the TLD domain name servers to respond to a query with both the name and IP address of the name server for the domain you ask for.

    For example, if you ask the .com name server for "example.com", it will respond with a glue record along the line of "ns1.example.com 10.20.30.41"

    It will actually come back as a set of separate records, so a query to the .com. name servers for the name server of example.com will look like this:

    @     IN   SOA   ns1.example.com. hostmaster.example.com ([some timeout stuff, etc])
      IN   NS    ns1
ns1   IN   A     10.20.30.41
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  2. @Hyppy's answer covers what glue records are.

    The other bit of your question is mismatched glue. This is what you get when the glue records held by the parent zone don't match the NS and A records that are in your authoritative copy of the zone.

    [technically those records in your own zone aren't glue - that term only refers to the non-authoritative data held by the parent zone].

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