There is a Jira ticket[1] related to this, but it seems that this is an unsupported feature, so I am request an RFE.

I've tried several times to set up ICMP timestamp rules [2]on rhosp17.1,

but it did not work. all ICMP traffic was blocked.

The existing ticket is quite old and hasn't been updated for some time.

the customer is currently waiting to hear whether this feature will be supported.

Could you please confirm if is this a supported feature or not?

If a feature is not supported, can it be supported?

 [1]

 https://issues.redhat.com/browse/OSPRH-18373

 [2]

~~~

parameter_defaults:
  ExtraFirewallRules:
    '000 drop icmp timestamp':
      proto: icmp
      type: 13
      jump: DROP
      ipversion: ipv4
    '000 drop icmp timestamp reply':
      proto: icmp
      type: 14
      jump: DROP
      ipversion: ipv4

~~~