core-agent-linux/vm-systemd/qubes-network.service

[Unit]
Description=Qubes network forwarding setup
ConditionPathExists=/var/run/qubes-service/qubes-network
Before=network.target
After=network-pre.target qubes-iptables.service

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/lib/qubes/init/network-proxy-setup.sh

[Install]
WantedBy=multi-user.target