In this article, I will give a simple example of setting up RPZ in Bind9.
Continue reading “How to set up RPZ in Bind9 (site blocking)”
RPZ (Response Policy Zone) allows you to block access to malicious and prohibited sites by domain name, IP address or network, block DNS servers.
In this article, I will give an example of adding a DNS zone to Bind9.
Continue reading “Setting up a DNS zone in Bind9”
Once on one server, on all pages where reCAPTCHA was used, they stopped working: contact form, forum registration form, password recovery forms, etc.
Continue reading “Solution reCAPTCHA Failed to open stream: Connection timed out”
In this article, I will briefly describe the principle of DDoS DNS Amplification attacks.
Continue reading “Description of DNS Amplification Attacks”
In this article I will give an example of detecting and blocking the sending of spam messages behind a NAT server.
Continue reading “Blocking SPAM behind a NAT server”
If the DNS settings of any site have been changed and in order not to wait for the time to cache DNS records, you can manually clear them, after which the DNS client on MacOS will request new data from the DNS servers.
Continue reading “How to clear DNS cache on MacOS”
In the Windows DNS cache, records of domain names with their IP addresses to which were accessed are stored. When a user opens a site for the first time, a DNS server is accessed; upon subsequent openings of a site, Windows already takes information from the cache. Therefore, if a new IP address has been assigned to a domain, then the system will access the old one for a while based on the data in the cache.
Continue reading “How to clear the DNS cache in Windows”
In this article I will give an example of generating keys and adding DKIM records.
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DMARC recors allow recipients and senders to verify the authenticity of messages, as well as determine what to do with messages that are not DKIM validated.
Continue reading “How to add DMARC record”
I will give an example of adding MX records in the DNS settings of a domain name registrar.
Continue reading “How to add MX record”