lazydns

Dual Selector Plugin

dual_selector filters DNS answers by IPv4/IPv6 preference. It is useful when you need to prefer A or AAAA records, or provide fallback behavior between the two address families.

Preferences

• ipv4 — keep only A records
• ipv6 — keep only AAAA records
• ipv4_prefer_ipv6_fallback — prefer IPv4; if none, keep IPv6
• ipv6_prefer_ipv4_fallback — prefer IPv6; if none, keep IPv4
• both — keep both A and AAAA

Configuration (plugin args)

The dual_selector plugin is configured via args.preference in the plugin config.

plugins:
  - tag: dual
    type: dual_selector
    args:
      preference: "ipv4" # ipv4 | ipv6 | ipv4_prefer_ipv6_fallback | ipv6_prefer_ipv4_fallback | both

When to use

• Use when you need to enforce IP family policy for clients that prefer one family or for environments where only one family is routable.

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