NETMARK,iproute2
iptablesにMARKマッチがある
https://atmarkit.itmedia.co.jp/fsecurity/rensai/lids11/lids01.html
https://atmarkit.itmedia.co.jp/fsecurity/rensai/lids12/lids01.html
https://takuya-1st.hatenablog.jp/entry/2023/06/21/170630