# Creating a Startup Service
Use `systemd` to create a sratup service.
The following example shows you how to create a systemd startup service that changes the maximum transmission unit (MTU) of the default Ethernet connection, `eth0`.
1. Concatenate the following block of code into a file:
```
cat << EOF >> /lib/systemd/system/eth0.service
[Unit]
Description=Network interface initialization
After=local-fs.target network-online.target network.target
Wants=local-fs.target network-online.target network.target
[Service]
ExecStart=/bin/ifconfig eth0 mtu 1460 up
Type=oneshot
[Install]
WantedBy=multi-user.target
EOF
```
1. Set the service to auto-start when the system boots:
```
cd /lib/systemd/system/multi-user.target.wants/
ln -s ../eth0.service eth0.service
```