https://segmentfault.com/a/1190000000646294
https://wiki.archlinux.org/index.php?title=IPsec-based_VPN_Server_(%E7%AE%80%E4%BD%93%E4%B8%AD%E6%96%87)&oldid=400327#.E8.AE.BE.E7.BD.AE_IPsec_.E9.BB.98.E8.AE.A4.E5.8F.82.E6.95.B0
http://www.mamicode.com/info-detail-1501081.html
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