opkg install xl2tpd --force-depends
[lac testvpn(VPN名称)]
name = #l2tp用户名#
lns = #l2tp服务器ip#
pppoptfile = /etc/ppp/peers/testvpn.l2tpd(拨号配置文件目录)
ppp debug = yes
参考:
https://blog.csdn.net/xyz846/article/details/87773742
https://shentuzhigang.blog.csdn.net/article/details/101975644