Rule settings in DNS Firewall - Amazon Route 53

Rule settings in DNS Firewall

When you create or edit a rule in a DNS Firewall rule group, you specify the following values:

Name

A unique identifier for the rule in the rule group.

(Optional) Description

A short description that provides more information about the rule.

Domain list

The list of domains that the rule inspects for. You can create and manage your own domain list or you can subscribe to a domain list that AWS manages for you. For more information, see Route 53 Resolver DNS Firewall domain lists.

Domain redirection setting

You can choose for the DNS Firewall rule to inspect only the first domain or all (default) the domains in the DNS redirection chain, such as CNAME, DNAME, etc. If you choose to inspect all the domains, you must add the subsequent domains in the DNS redirection chain to the domain list and set to the action you want the rule to take, either ALLOW, BLOCK, or ALERT. For more information, see Route 53 Resolver DNS Firewall components and settings.

Query type

The list of DNS query types that the rule inspects for. The following are the valid values:

  • A: Returns an IPv4 address.

  • AAAA: Returns an Ipv6 address.

  • CAA: Restricts CAs that can create SSL/TLS certifications for the domain.

  • CNAME: Returns another domain name.

  • DS: Record that identifies the DNSSEC signing key of a delegated zone.

  • MX: Specifies mail servers.

  • NAPTR: Regular-expression-based rewriting of domain names.

  • NS: Authoritative name servers.

  • PTR: Maps an IP address to a domain name.

  • SOA: Start of authority record for the zone.

  • SPF: Lists the servers authorized to send emails from a domain.

  • SRV: Application specific values that identify servers.

  • TXT: Verifies email senders and application-specific values.

  • A query type you define by using the DNS type ID, for example 28 for AAAA. The values must be defined as TYPENUMBER, where the NUMBER can be 1-65334, for example, TYPE28. For more information, see List of DNS record types.

    You can create one query type per rule.

Action

How you want DNS Firewall to handle a DNS query whose domain name matches the specifications in the rule's domain list. For more information, see Rule actions in DNS Firewall.

Priority

Unique positive integer setting for the rule within the rule group that determines processing order. DNS Firewall inspects DNS queries against the rules in a rule group starting with the lowest numeric priority setting and going up. You can change a rule's priority at any time, for example to change the order of processing or make space for other rules.