[Unit]
Description="Systemd script for tcpdump"
After=network.target network-online.target
Wants=network-online.target
[Service]
User=root
ExecStart=/bin/bash -lc 'usr/sbin/tcpdump -i eth0 -C 10000 -G 86400 -w /var/log/tcpdumps/tcp_dump_$$(date +%%Y-%%m-%%d-%%H:%%M:%%S).pcap -z gzip -s 0'
SuccessExitStatus=143
Restart=on-failure
RestartSec=10s

[Install]
WantedBy=multi-user.target