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Description of problem:
nomatch flag are not supported on ipset v6.11
# rpm -q ipset
ipset-6.11-4.el6.x86_64
# ipset create test hash:net
# ipset add test 1.1.1.1 nomatch
ipset v6.11: Unknown argument: `nomatch'
Try `ipset help' for more information.
# ipset create test hash:net family inet6
# ipset add test 2001::1 nomatch
ipset v6.11: Unknown argument: `nomatch'
Try `ipset help' for more information.

But ipset man page is as follows:
...
   hash:net
       The  hash:net set type uses a hash to store different sized IP network addresses.  Network address with zero prefix size cannot be stored in this type of sets.
...
       ADD-OPTIONS := [ timeout value ] [ nomatch ]
...


Version-Release number of selected component (if applicable):
RHEL-6.9-20161201.0 ==> kernel-2.6.32-676.el6
ipset-6.11-4.el6.x86_64


How reproducible:
always


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:
According to ipset change log, it seems that "nomatch" in hash:*net* sets is supported from v6.14,
http://ipset.netfilter.org/changelog.html

Red Hat Enterprise Linux 6 is in the Production 3 Phase. During the
Production 3 Phase, Critical impact Security Advisories (RHSAs) and
selected Urgent Priority Bug Fix Advisories (RHBAs) may be released as
they become available.

The official life cycle policy can be reviewed here:

http://redhat.com/rhel/lifecycle

This issue does not meet the inclusion criteria for the Production 3
Phase and will be marked as CLOSED/WONTFIX. If this remains a critical
requirement, please contact Red Hat Customer Support to request a
re-evaluation of the issue, citing a clear business justification. Note
that a strong business justification will be required for re-evaluation.