Many website owners mistakenly believe that DNSSEC configuration is very complex, but in reality, understanding its working principle and following the steps step by step can effectively improve the security of website resolution. The core idea of ​​DNSSEC is to verify whether the resolution result has been tampered with through public key encryption. DNSSEC adds a signature SN (RRSIG record), a public key (DNSKEY record), and a DS record for link trust to the DNS record, making the DNS resolution result unforgeable through a verification chain. In other words, even if an attacker poisons the domain name resolution, as long as the signature does not match, the recursive DNS server will refuse to return data, and users will not be misled to fake websites.

　　Configuring DNSSEC requires three steps: enabling DNSSEC with your DNS provider; generating a DS record; and adding the DS record in your domain registrar's console to establish a trust chain. The interfaces of different DNS providers may vary slightly, but the overall process is basically the same. Simply go to the DNSSEC page and click "Enable," and the system will automatically generate a DS record, including key tag, algorithm, digest type, and digest. This information needs to be copied to your domain registrar's backend.

　　After adding this DS information to the domain registrar's backend, the registrar will report the record to the next higher-level domain (e.g., the .com top-level domain server), thus forming a complete DNSSEC trust chain. After an activation time ranging from 5 minutes to 48 hours, DNSSEC will be fully enabled. At this point, any DNS forgery or poisoning responses will be verified and rejected, making the website more secure and reliable at the resolution level.

　　Website owners should be cautious when enabling DNSSEC, as the DS record must correspond to the DNS key generated by the DNS provider. If the two are inconsistent, all resolutions will fail, resulting in the website being completely inaccessible. Therefore, before migrating a DNS service, DNSSEC must be disabled and the domain registrar's DS record deleted, and then re-enabled after the new DNS provider generates a new record. This process seems simple, but many website owners overlook this, leading to a short period of website inaccessibility after migration, thus affecting business stability.

　　For users who have built their own DNS servers, such as those using BIND, DNSSEC can also be enabled through manual signing. The following is a typical BIND configuration example for generating ZSK and KSK:

dnssec-keygen -a RSASHA256 -b 2048 -n ZONE example.com
dnssec-keygen -a RSASHA256 -b 4096 -n ZONE -f KSK example.com

　　After generating the key, you need to add it to the zone file and execute the following steps:

dnssec-signzone -o example.com db.example.com

　　After signing, the zone file generates a .signed file and inserts the corresponding RRSIG and DNSKEY records, completing the DNSSEC deployment. Of course, for most website owners, using a managed DNS service is a safer and more reliable option, eliminating the need to handle complex matters such as key management, regular resigning, and security maintenance.

　　DNSSEC's advantage lies in its ability to fundamentally defend against DNS poisoning, but it doesn't solve all DNS-related problems. DNSSEC cannot improve resolution speed, nor can it prevent DNS services from being attacked by DDoS attacks. Its role is to ensure the true reliability of DNS, not its availability. Therefore, it doesn't conflict with optimization measures such as CDN, Global DNS, and Anycast; rather, they can complement each other. For example, DNS providers like Cloudflare support DNSSEC + Anycast + DDoS protection, which can simultaneously resist poisoning and attacks, providing a higher level of security for the site.

　　After deploying DNSSEC, website owners can verify its effectiveness using online tools. Simply enter the domain name to check if the DNSKEY, RRSIG, and DS records are normal, and whether there are any signature errors or link anomalies. If you see prompts like "Secure" or "All OK," it means your DNSSEC configuration is complete and correct. Problems usually stem from unsynchronized DS records, inconsistent DNSKEY versions, or expired zone file signatures. You'll need to fix each issue according to the prompts.

　　To help website owners better understand the significance of DNSSEC's anti-pollution measures, consider the user access process. When a user enters a website domain name, if the resolution path is maliciously hijacked, ordinary DNS cannot verify the authenticity of the returned IP address. DNSSEC, however, checks the signature; if the signature doesn't match, the returned value is discarded. This prevents attackers from forging resolution records and redirecting users to phishing sites. This is especially important for finance, e-commerce, and cross-border businesses, as these industries have high user interaction sensitivity, and losses caused by DNS tampering can be irreparable.

　　In practical use, DNSSEC's effectiveness against poisoning is also significant. Previously, due to link poisoning, accessing certain unprotected domains from within China would be redirected to incorrect IP addresses. With DNSSEC enabled, resolution nodes reject poisoned responses, resulting in either a normal access or a rejection, but never being incorrectly redirected to a malicious address. This enhances the overall security of website access and strengthens user trust in the website. Therefore, more and more internet companies, cloud service providers, and cross-border platforms are deploying DNSSEC on a large scale as part of their basic security infrastructure.

　　DNSSEC is one of the most effective technologies for solving DNS poisoning and a fundamental security capability that websites must possess. By correctly configuring DNSSEC, website owners can make the DNS resolution chain more trustworthy, protecting their websites from tampering and impersonation threats. As DNS security gains increasing importance, DNSSEC will undoubtedly become a standard technology in website construction in the future. By following the steps outlined in this article to gradually enable it, you can ensure your site remains stable and secure in complex network environments.