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https://issues.apache.org/jira/browse/KAFKA-13299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17574967#comment-17574967
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Jose Armando Garcia Sancio commented on KAFKA-13299:
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I am going to replace 3.3.0 with 3.4.0 for the fix version.
> Accept listeners that have the same port but use IPv4 vs IPv6
> -------------------------------------------------------------
>
> Key: KAFKA-13299
> URL: https://issues.apache.org/jira/browse/KAFKA-13299
> Project: Kafka
> Issue Type: Improvement
> Reporter: Matthew de Detrich
> Assignee: Matthew de Detrich
> Priority: Major
> Fix For: 3.3.0
>
>
> Currently we are going through a process where we want to migrate Kafka
> brokers from IPv4 to IPv6. The simplest way for us to do this would be to
> allow Kafka to have 2 listeners of the same port however one listener has an
> IPv4 address allocated and another listener has an IPv6 address allocated.
> Currently this is not possible in Kafka because it validates that all of the
> listeners have a unique port. With some rudimentary testing if this
> validation is removed (so we are able to have 2 listeners of the same port
> but with different IP versions) there doesn't seem to be any immediate
> problems, the kafka clusters works without any problems.
> Is there some fundamental reason behind this limitation of having unique
> ports? Consequently would there be any problems in loosening this limitation
> (i.e. duplicate ports are allowed if the IP versions are different) or just
> altogether removing the restriction
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