How many requests can a DNS server handle?

Generally organizations have a set of DNS servers, each one capable of handling up to 150,000 DNS queries per second. High performance DNS servers are capable of handling around 200,000 queries per second.

How big is a typical DNS request?

When a client sends a DNS query to your DNS server, normally the packet length is between 50 and 550 bytes (including the IP header) , so we can filter (or rate-limit) packets that fall outside this range.

How are DNS QPS calculated?

DNS Daily Peak Hour Query Rate by Member

Time: Timestamp of events.
QPS: Query per second. QPS is calculated with two steps: 1) find out the busiest hour (on the top of hours such as from 8:00am to 9:00am) by average hourly QPS, and 2) use that hour’s max/avg QPS as they daily max/avg QPS.

What is a good DNS query time?

between 20 and 120 milliseconds
The average DNS lookup time is between 20 and 120 milliseconds. Anything between that and under is generally considered very good.

Can I have 3 DNS servers?

You can have more than two for a domain but usually three is tops unless you have multiple server farms where you would want to distribute the DNS lookup load. It’s a good idea to have at least one of your DNS servers at a separate location. This can be helpful in the event one location goes down.

Is DNS request TCP or UDP?

Actually, DNS primarily uses the User Datagram Protocol (UDP) on port number 53 to serve requests. DNS queries consist of a single UDP request from the client followed by a single UDP reply from the server.

What is DNS 53?

Amazon Route 53 is a highly available and scalable cloud Domain Name System (DNS) web service. It is designed to give developers and businesses an extremely reliable and cost effective way to route end users to Internet applications by translating names like www.example.com into the numeric IP addresses like 192.0.

How do you calculate query per second?

How do I calculate QPS? It’s pretty simple actually. If you know the number of queries you currently processes per second, take that number and plug it into formula: QPS x 60 seconds per minute x 60minutes per hour x 24 hours per day x 30.41 average days per month.

How long does a DNS request take?

Upon accessing a web page, the browser finds all resources which require a DNS lookup and must wait until the lookup completes before it can download anything. According to YSlow, DNS lookups on average take between 20-120 milliseconds to complete.

Is Cloudflare the fastest DNS?

CloudFlare was the fastest DNS for 72% of all the locations . It had an amazing low average of 4.98 ms across the globe. Google and Quad9 were close for second and third respectively. Quad9 was faster than Google in North America and Europe, but under performed in Asia / South America.

How many queries per second does your DNS get?

According to our internal monitoring, the primary DNS is receiving an average of 800 queries a second, and the secondary’s getting about 700 queries a second. DNS resolution as tested with this command from a Linux box:

How fast is your DNS response time?

Should I configure more than one DNS server for my Windows client?

For these reasons, it’s recommended to configure any Windows client with more than one DNS server, but it’s important to be aware of the Windows client resolution process, as it’s different based on how many DNS servers we’ve configured. The behavior is the following (tested on Windows XP, Windows 7, and Windows 8 clients with a single NIC):

Why does my router send two DNS requests for the same name?

If the forwarders are located outside (ie Google or root hints) your router will send two outbound requests for the same name. DNS cache will prevent some requests from leaving a host obviously if it can respond from its cache instead.