我正在尝试使用一个简单的Android 4.4.4 VPN连接来打开/ xl2tpd / pppd组合。 IPSec SA起作用，但xl2tpd在某一点终止了pppd，并且在日志中显示：
xl2tpd[17990]: handle_avps: handling avp's for tunnel 46247, call 0 xl2tpd[17990]: message_type_avp: message type 4 (Stop-Control-Connection-Notification) xl2tpd[17990]: assigned_tunnel_avp: using peer's tunnel 54725 xl2tpd[17990]: result_code_avp: avp is incorrect size. 8 < 10 xl2tpd[17990]: handle_avps: Bad exit status handling attribute 1 (Result Code) on mandatory packet. xl2tpd[17990]: handle_packet: bad AVP handling! xl2tpd[17990]: network_thread: bad packet xl2tpd[17990]: build_fdset: closing down tunnel 46247 xl2tpd[17990]: Terminating pppd: sending TERM signal to pid 17991 xl2tpd[17990]: Connection 54725 closed to 87.114.120.198, port 50027 (Result Code: expected at least 10, got 8) 有很多在线求助，但无济于事：
我的xl2tpdconfiguration：
cat /etc/xl2tpd/xl2tpd.conf [global] ipsec saref = yes port = 1701 debug avp = yes debug tunnel = yes debug avp = yes debug packet = no debug network = yes debug state = yes [lns default] ip range = 10.152.2.2-10.152.2.254 local ip = 10.152.2.1 require chap = yes refuse pap = yes require authentication = yes ppp debug = yes pppoptfile = /etc/ppp/options.xl2tpd length bit = yes unix authentication = no
澄清：现有设置在iPad上适用于iOS 7