1. Create a new script file
I am here to set the boot automatically set ipv6 tunnel, so named for the ipv6tunnel.sh
ifconfig sit0 up ifconfig sit0 inet6 tunnel ::66.220.18.42 ifconfig sit1 up ifconfig sit1 inet6 add 2001:470:c:8a7::2/64 route -A inet6 add ::/0 dev sit1
2. Add execute permission to the script
chmod +x ipv6tunnel.sh
3. Add the boot
Just add to /etc/rc.d/rc.local script (note the full path). In centos7, the privileges / etc / rc.d / rc.local file is reduced, boot time to perform in your own scripts of some services can not start, execute the following command file can be marked as executable file
chmod +x /etc/rc.d/rc.local