Useful tips

What is a recursive DNS attack?

What is a recursive DNS attack?

A DNS recursion attack is essentially an amplification DoS attack. Therefore, the attack affects. multiple impact points: • DNS servers configured to provide recursion receive the spoofed requests and. generate replies to the spoofed address (i.e., the victim).

What is a recursive DNS query?

A recursive DNS lookup is where one DNS server communicates with several other DNS servers to hunt down an IP address and return it to the client. This is in contrast to an iterative DNS query, where the client communicates directly with each DNS server involved in the lookup.

How do I setup a recursive DNS query?

To configure recursive DNS, complete the following procedure:

  1. Open management GUI and select DNS.
  2. Select Change DNS Settings. Select Enable recursion. Enable Records caching (Optional).
  3. Click OK.
  4. Expand the DNS node.
  5. Select Name Servers.
  6. Click Add.
  7. Enter an available IP address on the network.
  8. Select Local.

Does DNS support recursive query?

Recursive DNS queries are standard requests by users or by domain name system (DNS) servers that are configured to pass along unresolved IP requests to another DNS server; in that way, the first server can stay available.

How does a recursive DNS server attack work?

Recursive DNS servers and DNS cache poisoning attacks In a DNS cache poisoning attack, when a recursive DNS server requests an IP address from another DNS server, an attacker intercepts the request and gives a fake response, which is often the IP address for a malicious website.

Can a NXDOMAIN attack target a DNS resolver?

NXDOMAIN attacks can also target a recursive resolver with the goal of filling the resolver’s cache with junk requests. Phantom domain attack: A phantom domain attack has a similar result to an NXDOMAIN attack on a DNS resolver. The attacker sets up a bunch of ‘phantom’ domain servers which either respond to requests very slowly or not at all.

How does an attacker do a DNS amplification attack?

The primary technique consists of an attacker sending a DNS name lookup request to an open DNS server with the source address spoofed to be the target’s address. When the DNS server sends the DNS record response, it is sent instead to the target.

Which is the most common attack on DNS servers?

Attackers have found a number of ways to target and exploit DNS servers, here’s some of the most common: DNS spoofing/ cache poisoning: This is an attack where forged DNS data is introduced into a DNS resolver’s cache, resulting in the resolver returning an incorrect IP address for a domain.