日志：
Jun 1 21:45:34 localhost xl2tpd[6349]: Forked again by Xelerance (www.xelerance.com) (C) 2006
Jun 1 21:45:34 localhost xl2tpd[6349]: Listening on IP address 0.0.0.0, port 1701
Jun 1 21:45:37 localhost xl2tpd[6349]: Connecting to host 192.187.101.133, port 1701
Jun 1 21:45:42 localhost xl2tpd[6349]: Maximum retries exceeded for tunnel 42629. Closing.
Jun 1 21:45:42 localhost xl2tpd[6349]: Connection 0 closed to 192.187.101.133, port 1701 (Timeout)
Jun 1 23:05:58 localhost auditd[1307]: Audit daemon rotating log files
Jun 2 00:59:54 localhost kernel: ip_tables: (C) 2000-2006 Netfilter Core Team
Jun 2 02:30:34 localhost auditd[1307]: Audit daemon rotating log files
Jun 2 05:48:14 localhost auditd[1307]: Audit daemon rotating log files
Jun 2 11:54:59 localhost auditd[1307]: Audit daemon rotating log files
Jun 2 12:34:51 localhost xl2tpd[6349]: Connecting to host 192.187.101.133, port 1701
Jun 2 12:34:56 localhost xl2tpd[6349]: Maximum retries exceeded for tunnel 9773. Closing.
Jun 2 12:34:56 localhost xl2tpd[6349]: Connection 0 closed to 192.187.101.133, port 1701 (Timeout)