A recursive DNS query is a type of DNS query in which a DNS server asks another DNS server to look up a domain name on behalf of the original DNS server. This type of query is used when a DNS server does not have the information requested by the original DNS server. The DNS server that responds to the recursive query is said to be providing recursive DNS services. What is a iterative DNS query? When a recursive DNS server receives a query from a client, it will first check to see if it can resolve the query itself. If not, it will send the query to a root name server. The root name server will then respond with the IP address of a top-level domain (TLD) server that can help resolve the query. The recursive DNS server will then send the query to the TLD server, which will either resolve the query or send it to a lower-level domain server. This process will continue until the query is either resolved or it reaches a server that does not have any more information about the domain in question.
What is the advantages of recursive DNS query?
There are many advantages of using recursive DNS queries, including:
1. Reduced network traffic: When a recursive DNS server receives a query, it will first check its own cache to see if it has the requested information. If it does, it can simply return the cached information, which reduces network traffic.
2. Increased security: Recursive DNS servers can be configured to use DNS security features such as DNSSEC, which can help protect against DNS spoofing attacks.
3. Increased performance: By caching DNS information, recursive DNS servers can speed up the process of resolving DNS queries.
4. Flexibility: Recursive DNS servers can be configured to use different DNS servers for different types of queries, which can increase flexibility and improve performance.
5. Reduced costs: By using a recursive DNS server, organizations can save money on DNS-related costs, such as bandwidth and hardware.
How do I setup a recursive DNS query?
Assuming you are using the BIND 9 DNS software, you can setup a recursive DNS query by adding the following line to the options section of your named.conf file:
Then, you will need to restart the BIND 9 service in order for the changes to take effect.
Should I use recursive DNS?
There is no one definitive answer to this question, as it depends on a variety of factors specific to your network and infrastructure. However, in general, recursive DNS can be a helpful tool in improving network performance and efficiency.
Some benefits of using recursive DNS include:
- Reduced network latency, as DNS queries are resolved more quickly
- Increased security, as DNS queries are more difficult to spoof
- Improved reliability, as DNS queries are less likely to fail
On the other hand, there are also some potential drawbacks to using recursive DNS, such as:
- Increased bandwidth usage, as more data is transferred between DNS servers
- Increased CPU usage, as DNS servers must process more queries
Ultimately, whether or not to use recursive DNS will come down to a trade-off between these various factors. If speed and security are your main priorities, then recursive DNS may be a good option for you. However, if you are concerned about bandwidth usage or CPU usage, then you may want to consider other options. Is Google DNS recursive? Yes, Google DNS is recursive.