Why am I not able to use synproxy with nftables?

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Issue

  • Why am I not able to use synproxy with nftables?
  • Why am I getting the below error when trying to setup synproxy with nftables in RHEL 7 and RHEL 8?
  /etc/sysconfig/nftables.conf:21:9-96: Error: Could not process rule: No such file or directory
 tcp dport 8888 ct state invalid,untracked synproxy mss 1460 wscale 7 timestamp sack-perm
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Resolution

  • The feature is provided in kernel 5.14.0-84.el9.x86_64.

Root Cause

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