mdedetrich commented on code in PR #11478:
URL: https://github.com/apache/kafka/pull/11478#discussion_r923514829


##########
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)) ||

Review Comment:
   > AFAIU it would not make sense to accept an address with a prefix here
   
   > I'm not sure whether we need to accept/support zone/scope here either, for 
the same reason.
   
   I haven't really looked into this, I would imagine that this is a different 
type of checking that would happen elsewhere? I guess I could look into this 
but to me this seems like a different feature/PR since this PR is specifically 
only about IPv4 vs IPv6.
   
   wdyt?



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