[Unit]
Description=Network Configuration
After=network.target

[Service]
Type=oneshot
ExecStart=/bin/bash -c 'sudo dhclient -r eth0 && sudo dhclient eth0 && sudo dhclient -r eth1 && sudo dhclient eth1 && sudo dhclient -r eth2 && sudo dhclient eth2 && echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf > /dev/null && echo "nameserver 8.8.4.4" | sudo tee -a /etc/resolv.conf > /dev/null && echo "nameserver 192.168.42.40" | sudo tee -a /etc/resolv.conf > /dev/null'
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target