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ipset in RHEL-7 is still at version 6.19. The current upstream version is 6.29.

There have been lots of bug fixes and enhancements in ipset since 6.19. For example this is namespace support and also ipset types like hash:mac.

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, 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/RHBA-2017:1904