default or selected kernelversion does not have config value CONFIG_NETDEBUG.
Result is shown for kernelversion 5.2.15

Network packet debugging

configname: CONFIG_NETDEBUG

Linux Kernel Configuration
└─>Networking
└─>Networking options
└─>Network packet debugging
In linux kernel since version 2.6.16 (release Date: 2006-03-19)  
You can say Y here if you want to get additional messages useful in
debugging bad packets, but can overwhelm logs under denial of service
attacks.

depends
CONFIG_NET