OpenWRT安装PPPoe服务器，当客户端连接或断开时通过ip-down.d/ip-up.d执行ROS命令，ROS需配置使用SSH Key验证。
当系统拨号断开时停止PPPoe：
mkdir /etc/ppp/ip-down.d
cat >/etc/ppp/ip-down.d/pppoe-down.sh << EOF
#!/bin/sh
ssh admin@192.168.1.21 "/interface pppoe-client disable pppoe-out1"
EOF
chmod +x /etc/ppp/ip-down.d/pppoe-down.sh 当连接系统拨号连接时开启PPPoe：
mkdir /etc/ppp/ip-up.d
cat >/etc/ppp/ip-up.d/pppoe-up.sh << EOF
#!/bin/sh
ssh admin@192.168.1.21 "/interface pppoe-client enable pppoe-out1"
EOF
chmod +x /etc/ppp/ip-up.d/pppoe-up.sh 2015.03.17更新：
ros重新拨号只需enable就行，无需先disable：
ssh admin@192.168.1.21 "/interface pppoe-client enable pppoe-out1"OpenWRT更新到14.07安装的pppoe不执行ip-down.d或up目录下脚本，需添加相应脚本，PPPD连接时会执行此脚本：
cat >/etc/ppp/ip-up << EOF
#!/bin/sh
[ -d /etc/ppp/ip-up.d ] && {
for SCRIPT in /etc/ppp/ip-up.d/*
do
[ -x "$SCRIPT" ] && "$SCRIPT" "$@"
done
}
EOF
chmod +x /etc/ppp/ip-up