运营商不下发ipv6前缀，通过openwrt热插拔特性，自动下发前缀

运营商不下发ipv6前缀，通过openwrt热插拔特性，自动下发前缀vim /etc/hotplug.d/iface/99-ipv6#!/bin/sh[ "$ACTION" = ifup ] || exit 0[ "$INTERFACE" = wan_6 ]