[OpenWrt Wiki] Linux Network Interfaces
https://openwrt.org/docs/guide-developer/networking/network.interfaces32 rader · lo, eth0:1, eth0.1, vlan2, br0, pppoe-dsl, gre0, sit0 tun0, imq0, teql0, .. are virtual network interfaces that do NOT represent an existent hardware device but are linked to one (otherwise they would be useless).Virtual network interfaces were invented to give the system administrator maximum flexibility when configuring a Linux-based operating system.