In this video, Chaim Krause describes the relationship between a PTR resource record and reverse lookups. Understanding the order in which these are written can sometimes be confusing.
- [Tutor] PTR or Pointer Records,…are used when something called a reverse lookup is made.…A forward lookup, which is just query,…is where a nameserver is queried with a hostname,…and returns an IP address.…In a reverse lookup the nameserver is provided an IP address…and the answer includes the hostname…associated with that address.…Separate zone files are used for reverse lookups.…Our example file is a forward zone file,…or just simply zone file.…
Here is an example of reverse lookup zone file.…You can see that they look very similar…to a standard zone configuration file.…The main difference is in the order in which…the IPv4 addresses are written.…They are written in reverse order.…This is because they go from the most specific…to the least specific.…You will see the SOA record and the NS records…that define the domain, but you probably only see…other PTR resource records beyond that…in a reverse lookup zone file.…
Let's take a look at one of the PTR resource records…in this example.…The first such record is 3.8.9 IN PTR ns1.example.com.…
- Working with different types of name servers
- Working with zone files
- Setting up a basic name server
- Creating, verifying, loading, and testing the zone file
- Allowing queries from localnets
- Configuring an advanced name server
- Serving a website or email
- Adding security
Skill Level Intermediate
Linux: Multitasking at the Command Linewith Scott Simpson39m 1s Intermediate
1. Installing BIND
Installing BIND1m 4s
2. Types of Name Servers
3. Zone Configuration File
4. Basic Name Server Setup
5. Advanced Name Server Setup
6. Security Concerns
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