自己搭建的 vpn，PPTP 正常，但 L2TP，连接一会儿就断开了，有人知道这是为什么吗？

[hermitu]

[20150517]

不帖logs,谈毛？

[hermitu]

@20150517

May 27 18:28:18 AT16-558 xl2tpd[1492]: Connection established to 218.28.71.4, 39761. Local: 15923, Remote: 15 (ref=0/0). LNS session is 'default'
May 27 18:28:18 AT16-558 xl2tpd[1492]: Call established with 218.28.71.4, Local: 42467, Remote: 1, Serial: 0
May 27 18:29:23 AT16-558 xl2tpd[1492]: Maximum retries exceeded for tunnel 15923. Closing.
May 27 18:29:23 AT16-558 pppd[9926]: Modem hangup
May 27 18:29:23 AT16-558 pppd[9926]: Connect time 1.1 minutes.
May 27 18:29:23 AT16-558 pppd[9926]: Sent 262470 bytes, received 79936 bytes.
May 27 18:29:23 AT16-558 pppd[9926]: Connection terminated.
May 27 18:29:23 AT16-558 pppd[9926]: Terminating on signal 15
May 27 18:29:23 AT16-558 pppd[9926]: Exit.
May 27 18:29:23 AT16-558 xl2tpd[1492]: Connection 15 closed to 218.28.71.4, port 39761 (Timeout)
May 27 18:32:35 AT16-558 xl2tpd[1492]: Maximum retries exceeded for tunnel 19910. Closing.