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Customer has the same issue described in upstream bug https://bugs.openjdk.java.net/browse/JDK-8187450. They would like it to be fixed for OpenJDK 11.

This issue should be fixed with JDK 11.0.12 and better. Pushed to the upstream jdk11u-dev tree now which will become 11.0.12 in July 2021.

jtreg test of jdk/java/net/NetworkInterface/Test should be covering this issue

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: java-11-openjdk security and bug fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:1297