Dns which port

This behavior may not have caused visible problems in the past or it did but no one understood why , but as DNS data continues to increase in size, it is important that all network equipment is configured correctly to support large DNS packet sizes. If the network environment does not fully support large DNS messages, it may lead to the DNS message being rejected by network gear, or partially dropped during fragmentation. While EDNS is necessary for the operation of modern-day DNS, the ability to send larger messages contributed to volumetric attacks such as Amplification and Reflection.

What is DNS Protection? What is DANE? Updated: 6 days ago. DNS port is confusing for many people. It's lightweight and faster than TCP. This is to reduce performance overhead on the DNS server due to the number of requests it is likely to receive. Zone transfers happen over TCP port This happens on the DNS server side which is not related to the end-user.

What is zone transfer? We will discuss more on this next. Check this post to learn more about DNS port. Dig is a powerful Linux command to query DNS info. DNS can be used by attackers as one of their reconnaissance techniques. Public information contained a target's servers is valuable to an attacker and helps them focus their attacks.

Attackers can use a variety of techniques to retrieve DNS information through queries. However, hackers often try to perform a zone transfer from your authoritative DNS servers to gain access to even more information. So you have to allow all traffic in and out sent to port 53 requests , and possibly all traffic in and out from port 53 to any application port responses.

One example is the "NG" firewall software from "Check Point Software Technologies" which is also embedded in some hardware solutions. It is necessary to disable this feature for certain DNS functions such as zone update notifications to secondary servers to work.

Simple DNS Plus.