default or selected kernelversion does not have config value CONFIG_IP_NF_CONNTRACK_MARK.
Result is shown for kernelversion 5.4.123
Connection mark tracking support
configname: CONFIG_IP_NF_CONNTRACK_MARK
Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering (replaces ipchains)
└─>IP: Netfilter Configuration
└─>Connection mark tracking support
In linux kernel since version 2.6.12
This option enables support for connection marks, used by the
`CONNMARK' target and `connmark' match. Similar to the mark value
of packets, but this mark value is kept in the conntrack session
instead of the individual packets.
`CONNMARK' target and `connmark' match. Similar to the mark value
of packets, but this mark value is kept in the conntrack session
instead of the individual packets.