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DNS Denylisting

D3-DNSDL
D3-DNSDL (DNS Denylisting)

Definition

Blocking DNS Network Traffic based on criteria such as IP address, domain name, or DNS query type.

Synonyms: DNS Blacklisting .

How it works

Rules are implemented that filter DNS queries using criteria such as:

  • Client subnet
  • Type of network protocol used in query
  • Fully qualified domain name (FQDN) of record in the query
  • DNS Server IP address that received the DNS request
  • Type of DNS record being queried
  • Time of day the query is received
  • Size of the response

For example, a DNS policy can be created for blocking DNS queries for FQDNs that have been identified as unauthorized.

Considerations

  • Implementation considerations for DNS filtering policies to avoid over-blocking or under-blocking domains.
  • Continuous maintenance of unauthorized domain lists is needed to keep up to date with possible site content changes.
  • File sharing or content delivery networks may require other filtering techniques that are more fine-grained (URL blocking).
  • Access to malicious websites or other network resources directly by IP instead of by DNS record, or after alteration of local DNS hosts file, may not result in DNS network traffic.
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Technique Subclasses

There are 6 techniques in this category, DNS Denylisting.

Name ID Definition Synonyms
DNS Denylisting D3-DNSDL Blocking DNS Network Traffic based on criteria such as IP address, domain name, or DNS query type. DNS Blacklisting
- Reverse Resolution IP Denylisting D3-RRID Blocking a reverse lookup based on the query's IP address value. Reverse Resolution IP Blacklisting
- Forward Resolution Domain Denylisting D3-FRDDL Blocking a lookup based on the query's domain name value. Forward Resolution Domain Blacklisting
- Forward Resolution IP Denylisting D3-FRIDL Blocking a DNS lookup's answer's IP address value. Forward Resolution IP Blacklisting
- Hierarchical Domain Denylisting D3-HDDL Blocking the resolution of any subdomain of a specified domain name. Hierarchical Domain Blacklisting
- Homoglyph Denylisting D3-HDL Blocking DNS queries that are deceptively similar to legitimate domain names. Homoglyph Blacklisting
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References

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User Manual

The following references were used to develop the DNS Denylisting knowledge-base article.

(Note: the consideration of references does not imply specific functionality exists in an offering.)

Use DNS Policy for Applying Filters on DNS Queries

Reference Type: User Manual Organization: Microsoft
Source: https://docs.microsoft.com/en-us/windows-server/networking/dns/deploy/apply-filters-on-dns-queries

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