dns: add v4 preferred option (#18108)

Signed-off-by: Jose Nino <jnino@lyft.com>

Mirrored from https://github.com/envoyproxy/envoy @ 6d09a15512e491a577d1d764d270df0ef5deeef2
pull/624/head
data-plane-api(Azure Pipelines) 3 years ago
parent 8316a77fb3
commit bbe9e507cd
  1. 8
      envoy/config/cluster/v3/cluster.proto

@ -123,15 +123,23 @@ message Cluster {
// only perform a lookup for addresses in the IPv6 family. If AUTO is
// specified, the DNS resolver will first perform a lookup for addresses in
// the IPv6 family and fallback to a lookup for addresses in the IPv4 family.
// This is semantically equivalent to a non-existent V6_PREFERRED option.
// AUTO is a legacy name that is more opaque than
// necessary and will be deprecated in favor of V6_PREFERRED in a future major version of the API.
// If V4_PREFERRED is specified, the DNS resolver will first perform a lookup for addresses in the
// IPv4 family and fallback to a lookup for addresses in the IPv6 family. i.e., the callback
// target will only get v6 addresses if there were NO v4 addresses to return.
// For cluster types other than
// :ref:`STRICT_DNS<envoy_v3_api_enum_value_config.cluster.v3.Cluster.DiscoveryType.STRICT_DNS>` and
// :ref:`LOGICAL_DNS<envoy_v3_api_enum_value_config.cluster.v3.Cluster.DiscoveryType.LOGICAL_DNS>`,
// this setting is
// ignored.
// [#next-major-version: deprecate AUTO in favor of a V6_PREFERRED option.]
enum DnsLookupFamily {
AUTO = 0;
V4_ONLY = 1;
V6_ONLY = 2;
V4_PREFERRED = 3;
}
enum ClusterProtocolSelection {

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