header

Source

header modifies the header for responses.

Description

header ensures that the flags are in the desired state for responses. The modifications are made transparently for the client.

Syntax

header {
    ACTION FLAGS...
    ACTION FLAGS...
}
  • ACTION defines the state for DNS message header flags. Actions are evaluated in the order they are defined so last one has the most precedence. Allowed values are:
    • set
    • clear
  • FLAGS are the DNS header flags that will be modified. Current supported flags include:
    • aa - Authoritative(Answer)
    • ra - RecursionAvailable
    • rd - RecursionDesired

Examples

Make sure recursive available ra flag is set in all the responses:

. {
    header {
        set ra
    }
}

Make sure “recursion available” ra and “authoritative answer” aa flags are set and “recursion desired” is cleared in all responses:

. {
    header {
        set ra aa
        clear rd
    }
}