What Is DNS Security?

Definition: DNS spoofing is a kind of spoofing by an attacker impersonating a domain name server. Principle: If you can impersonate a domain name server, and then set the IP address of the query to the IP address of the attacker, then the user can only see the attacker's homepage on the Internet, instead of the homepage of the website the user wants to obtain. This is the basic principle of DNS spoofing. DNS spoofing isn't really "hacking" the other party's website, it's just pretending to be fraudulent.

DNS spoofing

Definition: DNS spoofing is an attacker impersonation

Exist on the Internet

DNS spoofing attacks are difficult to defend against because most of these attacks are passive in nature. Normally, unless a spoofing attack occurs, it is impossible for you to know that your DNS has been spoofed, but the webpage you open is different from the webpage you want to see. In many targeted attacks, users are unable to know that they have entered online banking account information into the wrong URL. Users will not know until they receive a call from a bank to inform them that their account has purchased a certain high-priced product. That said, there are still traces to defend against this type of attack.

Use the latest version of DNS server software and install patches in a timely manner

Disable the recursive function of the DNS server. The DNS server uses the record information in the cache to answer a query request or the DNS server obtains query information by querying other services and sends it to the client. These two types of queries become recursive queries. This query method is likely to cause DNS spoofing.

Protect internal devices: Most attacks like this are performed from the inside of the network. If your network devices are secure, it will be difficult for those infected hosts to launch spoofing attacks on your device.

Don't rely on DNS: On highly sensitive and secure systems, you usually don't browse the web on these systems and don't use DNS in the end. If you have software that depends on the hostname to run, you can specify it manually in the device host file.

Use intrusion detection system: As long as it is properly deployed and configured, it can detect most forms of ARP cache poisoning attacks and DNS spoofing attacks.

Using DNSSEC: DNSSEC is a better alternative to DNS. It uses DNS records in front of numbers to ensure the validity of query responses. DNSSEC has not been widely used, but it has been recognized as the future direction of DNS. The US Department of Defense has required that all MIL and GOV domain names must begin using DNSSEC.