diff --git a/docs/root/api/starting_envoy.rst b/docs/root/api/starting_envoy.rst
index 05e7af0270..7b34dfa3f2 100644
--- a/docs/root/api/starting_envoy.rst
+++ b/docs/root/api/starting_envoy.rst
@@ -392,7 +392,7 @@ on supported platforms (iOS 12+) to update the preferred Envoy network cluster (
 ``enableHappyEyeballs``
 ~~~~~~~~~~~~~~~~~~~~~~~
 
-Specify whether to use Happy Eyeballs when multiple IP stacks may be supported.
+Specify whether to use Happy Eyeballs when multiple IP stacks may be supported. Defaults to true.
 
 **Example**::
 
diff --git a/docs/root/intro/version_history.rst b/docs/root/intro/version_history.rst
index 477544c083..25d05e8dbd 100644
--- a/docs/root/intro/version_history.rst
+++ b/docs/root/intro/version_history.rst
@@ -7,6 +7,7 @@ Pending Release
 Breaking changes:
 
 - api: replace the `drainConnections()` method with a broader `resetConnectivityState()`. (:issue:`#2225 <2225>`).
+- net: enable happy eyeballs by default (:issue:`#2272 <2272>`)
 
 Bugfixes:
 
diff --git a/library/common/config/config.cc b/library/common/config/config.cc
index f36c7120eb..b8de82ddb3 100644
--- a/library/common/config/config.cc
+++ b/library/common/config/config.cc
@@ -45,9 +45,9 @@ const std::string config_header = R"(
 - &dns_fail_base_interval 2s
 - &dns_fail_max_interval 10s
 - &dns_query_timeout 25s
-- &dns_lookup_family V4_PREFERRED
+- &dns_lookup_family ALL
 - &dns_min_refresh_rate 60s
-- &dns_multiple_addresses false
+- &dns_multiple_addresses true
 - &dns_preresolve_hostnames []
 - &dns_refresh_rate 60s
 - &dns_resolver_name envoy.network.dns_resolver.cares
diff --git a/library/kotlin/io/envoyproxy/envoymobile/EngineBuilder.kt b/library/kotlin/io/envoyproxy/envoymobile/EngineBuilder.kt
index 7bced539d5..277c531d26 100644
--- a/library/kotlin/io/envoyproxy/envoymobile/EngineBuilder.kt
+++ b/library/kotlin/io/envoyproxy/envoymobile/EngineBuilder.kt
@@ -41,7 +41,7 @@ open class EngineBuilder(
   private var dnsPreresolveHostnames = "[]"
   private var enableDrainPostDnsRefresh = false
   private var enableHttp3 = false
-  private var enableHappyEyeballs = false
+  private var enableHappyEyeballs = true
   private var enableInterfaceBinding = false
   private var h2ConnectionKeepaliveIdleIntervalMilliseconds = 1
   private var h2ConnectionKeepaliveTimeoutSeconds = 10
@@ -231,7 +231,8 @@ open class EngineBuilder(
   }
 
   /**
-   * Specify whether to use Happy Eyeballs when multiple IP stacks may be supported.
+   * Specify whether to use Happy Eyeballs when multiple IP stacks may be supported. Defaults to
+   * true.
    *
    * @param enableHappyEyeballs whether to enable RFC 6555 handling for IPv4/IPv6.
    *
diff --git a/library/swift/EngineBuilder.swift b/library/swift/EngineBuilder.swift
index dd9fc6ad07..6c69cee0b7 100644
--- a/library/swift/EngineBuilder.swift
+++ b/library/swift/EngineBuilder.swift
@@ -22,7 +22,7 @@ open class EngineBuilder: NSObject {
   private var dnsMinRefreshSeconds: UInt32 = 60
   private var dnsPreresolveHostnames: String = "[]"
   private var dnsRefreshSeconds: UInt32 = 60
-  private var enableHappyEyeballs: Bool = false
+  private var enableHappyEyeballs: Bool = true
   private var enableInterfaceBinding: Bool = false
   private var enforceTrustChainVerification: Bool = true
   private var enableDrainPostDnsRefresh: Bool = false
@@ -154,7 +154,8 @@ open class EngineBuilder: NSObject {
     return self
   }
 
-  /// Specify whether to use Happy Eyeballs when multiple IP stacks may be supported.
+  /// Specify whether to use Happy Eyeballs when multiple IP stacks may be supported. Defaults to
+  /// true.
   ///
   /// - parameter enableHappyEyeballs: whether to enable RFC 6555 handling for IPv4/IPv6.
   ///
diff --git a/test/kotlin/apps/experimental/MainActivity.kt b/test/kotlin/apps/experimental/MainActivity.kt
index 1836d682a5..5eb19b5fd9 100644
--- a/test/kotlin/apps/experimental/MainActivity.kt
+++ b/test/kotlin/apps/experimental/MainActivity.kt
@@ -50,7 +50,6 @@ class MainActivity : Activity() {
       .addPlatformFilter(::DemoFilter)
       .addPlatformFilter(::BufferDemoFilter)
       .addPlatformFilter(::AsyncDemoFilter)
-      .enableHappyEyeballs(true)
       .h2ExtendKeepaliveTimeout(true)
       .enableInterfaceBinding(true)
       .addNativeFilter("envoy.filters.http.buffer", "{\"@type\":\"type.googleapis.com/envoy.extensions.filters.http.buffer.v3.Buffer\",\"max_request_bytes\":5242880}")
diff --git a/test/swift/apps/experimental/ViewController.swift b/test/swift/apps/experimental/ViewController.swift
index 8ce5732808..59644895ed 100644
--- a/test/swift/apps/experimental/ViewController.swift
+++ b/test/swift/apps/experimental/ViewController.swift
@@ -22,7 +22,6 @@ final class ViewController: UITableViewController {
       .addPlatformFilter(DemoFilter.init)
       .addPlatformFilter(BufferDemoFilter.init)
       .addPlatformFilter(AsyncDemoFilter.init)
-      .enableHappyEyeballs(true)
       .h2ExtendKeepaliveTimeout(true)
       .enableInterfaceBinding(true)
       // swiftlint:disable:next line_length