tombentley commented on code in PR #11478:
URL: https://github.com/apache/kafka/pull/11478#discussion_r923484438


##########
core/src/main/scala/kafka/utils/CoreUtils.scala:
##########
@@ -252,16 +255,62 @@ object CoreUtils {
     listenerListToEndPoints(listeners, securityProtocolMap, true)
   }
 
+  def validateOneIsIpv4AndOtherIpv6(first: String, second: String): Boolean =
+    (inetAddressValidator.isValidInet4Address(first) && 
inetAddressValidator.isValidInet6Address(second)) ||
+      (inetAddressValidator.isValidInet6Address(first) && 
inetAddressValidator.isValidInet4Address(second))
+
+  def checkDuplicateListenerNames(endpoints: Seq[EndPoint], listeners: 
String): Unit = {
+    val distinctListenerNames = endpoints.map(_.listenerName).distinct
+    require(distinctListenerNames.size == endpoints.size, s"Each listener must 
have a different name unless you have exactly " +
+      s"one listener on IPv4 and the other IPv6 on the same port, listeners: 
$listeners")
+  }
+
+  def checkDuplicateListenerPorts(endpoints: Seq[EndPoint], listeners: 
String): Unit = {
+    val distinctPorts = endpoints.map(_.port).distinct
+    require(distinctPorts.size == endpoints.map(_.port).size, s"Each listener 
must have a different port, listeners: $listeners")
+  }
+
   def listenerListToEndPoints(listeners: String, securityProtocolMap: 
Map[ListenerName, SecurityProtocol], requireDistinctPorts: Boolean): 
Seq[EndPoint] = {
     def validate(endPoints: Seq[EndPoint]): Unit = {
-      // filter port 0 for unit tests
-      val portsExcludingZero = endPoints.map(_.port).filter(_ != 0)
-      val distinctListenerNames = endPoints.map(_.listenerName).distinct
-
-      require(distinctListenerNames.size == endPoints.size, s"Each listener 
must have a different name, listeners: $listeners")
-      if (requireDistinctPorts) {
-        val distinctPorts = portsExcludingZero.distinct
-        require(distinctPorts.size == portsExcludingZero.size, s"Each listener 
must have a different port, listeners: $listeners")
+      val (duplicatePorts, nonDuplicatePorts) = endPoints.filter {
+        ep => ep.port != 0

Review Comment:
   Could we restore the comment about port 0? Otherwise it's not obvious why we 
special case it.



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