ss doesn't allow AND or OR expressions with parenthesis in RHEL 8

ss doesn't allow AND or OR expressions with parenthesis in RHEL 8

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環境

• Red Hat Enterprise Linux (RHEL) 8
• iproute

問題

• In RHEL 8 its been observed that the 

  ss

   program cannot work with parenthesis, but this filter was working in RHEL 7.

  Raw

  ss sport = 22 or dport = 22 but not with: ss sport = 22 or ( dport = 22 )

決議

• Please update to one of the following package versions or higher to resolve this issue:

Release	Errata	Package version
RHEL 8.1