https://www.freesion.com/article/1543993728/

modprobe tun

/etc/yum.repos.d/nux-misc.repo

[nux-misc]
name=Nux Misc
baseurl=http://li.nux.ro/download/nux/misc/el7/x86_64/
enabled=0
gpgcheck=1
gpgkey=http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro


yum --enablerepo=nux-misc install tunctl

ip tuntap del dev tap0 mod tap # 删除 tap 

ip tuntap add dev 709test mod tap  or
tunctl -t 709test -u root
ifconfig 709test 100.1.4.138  netmask 255.255.255.0 promisc


mount -t cifs //10.1.4.165/meet_code /root/_sunning_dir/mount2 -o username=Administrator,password=sunning521,vers=2.0

ip tuntap add dev test_if mod tap
ifconfig 709test 100.1.4.138  netmask 255.255.255.0 promisc