Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

//lib/systemd/system/dns-clean.service

 [Unit]
Description=Clean up any mess left by 0dns-up

DefaultDependencies=false
Before=network-manager.service systemd-networkd.service networking.service resolvconf.service
After=local-fs.target
Requires=local-fs.target

ConditionPathExists=/etc/ppp/ip-down.d/0dns-down

[Service]
Type=oneshot
ExecStartPre=/bin/mkdir -p /var/run/pppconfig
ExecStart=/etc/ppp/ip-down.d/0dns-down "0dns-clean"

[Install]
WantedBy=multi-user.target