DNS – IT Blog

How to set up RPZ in Bind9 (site blocking)

In this article, I will give a simple example of setting up RPZ in Bind9.
RPZ (Response Policy Zone) allows you to block access to malicious and prohibited sites by domain name, IP address or network, block DNS servers.

Setting up a DNS zone in Bind9

In this article, I will give an example of adding a DNS zone to Bind9.

Solution reCAPTCHA Failed to open stream: Connection timed out

Once on one server, on all pages where reCAPTCHA was used, they stopped working: contact form, forum registration form, password recovery forms, etc.

Description of DNS Amplification Attacks

In this article, I will briefly describe the principle of DDoS DNS Amplification attacks.

Blocking SPAM behind a NAT server

In this article I will give an example of detecting and blocking the sending of spam messages behind a NAT server.

How to clear DNS cache on MacOS

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.

How to clear the DNS cache in Windows

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.

Tag Archives: DNS