At present, the website is in the increasingly serious network attack threat environment, in order to protect the security of the website, many webmasters are willing to migrate their website to the United States highly protected server. It should be noted that in the process of website migration, the adjustment of DNS Settings is also very important, and the wrong DNS configuration will affect the operation of the website, which may seriously cause the website to be unable to access the SEO ranking. Therefore, the webmasters should correctly configure DNS when migrating the website to ensure the smooth migration of the website to the United States high defense server.
In website migration, the adjustment of DNS focuses on domain name resolution, CDN acceleration, DNS hijacking defense, and TTL (Time-To-Live) optimization. First, you need to modify the domain name resolution record to ensure that website traffic is properly directed to the US high security server. Usually, domain name resolution includes A record, CNAME record, MX record, TXT record, etc. The most critical is the adjustment of A record and CNAME record in the migration process. Record A indicates the IP address of the server. If A new IP address is provided, the webmaster needs to change the original record A to the new IP address so that traffic can be correctly directed to the high-defense equipment room. If the CDN architecture is used, you need to use the CNAME record to point to the high-defense CDN node to ensure the normal access to the website, and use the CDN cache capability to reduce the pressure on the source site.
The effective time of DNS resolution is also affected by the TTL value, which refers to the time that DNS resolution records are stored in the cache. To make the DNS resolution change take effect as soon as possible, you are advised to set the TTL value to a lower value (for example, 300 seconds) before modifying the DNS record. After the DNS resolution change is resolved, the client can obtain the new resolution record faster, reducing access exceptions caused by the DNS cache. After the modification is complete, you can adjust the TTL value to a higher value after the resolution takes effect to reduce the number of DNS queries and improve the resolution performance.
In addition to the basic DNS resolution Settings, there are also DNS security issues to pay attention to when using a US high-security server. Some attackers may use DNS hijacking, contamination, or cache poisoning to attack websites, causing traffic to be hijacked to malicious sites. Therefore, it is recommended to use an authoritative DNS resolution provider and enable DNSSEC (DNS Security Extension) technology to prevent domain name resolution from being tampered with. In addition, you are advised to configure a defensive DNS resolution policy to automatically assign the optimal resolution path based on the user's geographical location and network status to ensure access speed and stability.
In some cases, you may also need to adjust the DNS records of the mail server, such as MX records, after the website is migrated to the US high security server. If the email system remains on the original server, ensure that MX records have not been modified. Otherwise, emails cannot be received properly. If the website's mail server is also migrated to the US high security server, you need to update MX records to point to the new mail server, and ensure that anti-spam policies such as SPF and DKIM are updated simultaneously to avoid emails being marked as spam.
If all-site HTTPS encryption is used in the US high defense server, you may need to update the SSL certificate resolution configuration to ensure that the HTTPS certificates between the CDN node and the source site match. Otherwise, SSL certificate errors or HTTPS access exceptions may occur.
Once done, it is recommended to use an online DNS detection tool (such as nslookup, dig command, or third-party DNS resolution detection tool) to verify that the DNS record is valid and to observe whether the website can be accessed normally. At the same time, continuously monitor the access to the website to ensure smooth user access and avoid traffic loss or access anomalies caused by DNS resolution errors.
In summary, DNS configuration adjustment is also very important in the process of website migration to the US high defense server. You need to modify the A record /CNAME record direction, optimize the TTL value to ensure that the accelerated resolution takes effect, prevent DNS hijacking, adjust MX records, and ensure that the HTTPS certificate is compatible. After the migration, the analysis results should be verified, and the appropriate solution should be selected according to the service requirements.
