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currently the nftables tool supports the following symbols for pkt_type matches:

broadcast
multicast
unicast

with the latter being quite misleading, actually meaning 'unicast packet for this host' or PACKET_HOST, in term of kernel's define.

Other relevant symbols are advisable, e.g. at least for the pkt_type PACKET_OTHERHOST.

This was fixed by Florian:

commit 8a7f6de536408336770e352cde939f8cb09a644d
Author: Florian Westphal <fw>
Date:   Thu Oct 27 14:31:34 2016 +0200

    meta: fix pkttype name and add 'other' symbol
    
    'unicast' doesn't check for unicast packets; it checks for PACKET_HOST,
    i.e. a packet coming in for this host.
    
    A unicast address to some other machine (e.g. because nic is
    in promisc mode) will have PACKET_OTHER.
    
    So at best this is misleading, so this patch changes it
    to 'host'.  The unicast entry is retained for compat purpose.
    
    Signed-off-by: Florian Westphal <fw>
    Acked-by: Pablo Neira Ayuso <pablo>

The patch is part of v0.7 release. Since RHEL7.5 will come with v0.8, this ticket is merely TestOnly anymore.

Targeting RHEL7.6 for testing this.

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-2018:3154