{"id":607,"date":"2026-05-14T04:19:02","date_gmt":"2026-05-14T04:19:02","guid":{"rendered":"https:\/\/rocketspacevpn.com\/"},"modified":"2026-05-14T06:20:11","modified_gmt":"2026-05-14T06:20:11","slug":"l2tp","status":"publish","type":"post","link":"https:\/\/rocketspacevpn.com\/zh\/post\/l2tp\/","title":{"rendered":"\u4ec0\u4e48\u662f L2TP\uff1f\u7b2c\u4e8c\u5c42\u96a7\u9053\u534f\u8bae (Layer 2 Tunneling Protocol) \u5b8c\u5168\u6307\u5357"},"content":{"rendered":"

L2TP\uff08\u7b2c\u4e8c\u5c42\u96a7\u9053\u534f\u8bae\uff09\u662f\u4e00\u79cd\u4f1a\u8bdd\u5c42\u7f51\u7edc\u534f\u8bae\uff0c\u662f\u6784\u5efa\u865a\u62df\u4e13\u7528\u7f51\u7edc (VPN) \u7684\u57fa\u672c\u57fa\u77f3\u3002L2TP \u5728 RFC 2661 \u4e2d\u88ab\u6b63\u5f0f\u5b9a\u4e49\uff0c\u4e3b\u8981\u8fd0\u884c\u5728 OSI \u6a21\u578b\u7684\u6570\u636e\u94fe\u8def\u5c42\uff08\u7b2c\u4e8c\u5c42\uff09\uff0c\u4f46\u5728\u73b0\u4ee3 IP \u7f51\u7edc\u4e2d\uff0c\u5b83\u901a\u5e38\u901a\u8fc7 UDP \u7aef\u53e3 1701 \u8fdb\u884c\u4f20\u8f93\u3002\u5176\u6280\u672f\u672c\u8d28\u5728\u4e8e\u80fd\u591f\u5c01\u88c5\u70b9\u5bf9\u70b9\u534f\u8bae (PPP) \u5e27\uff0c\u4f7f\u5176\u80fd\u591f\u8de8\u8d8a\u5404\u79cd\u53ef\u80fd\u4e0d\u517c\u5bb9\u7684\u5e95\u5c42\u7f51\u7edc\uff08\u5982 IP\u3001\u5e27\u4e2d\u7ee7\u6216 ATM\uff09\u8fdb\u884c\u96a7\u9053\u4f20\u8f93\uff0c\u4ece\u800c\u5728 LAC\uff08L2TP \u8bbf\u95ee\u96c6\u4e2d\u5668\uff09\u548c LNS\uff08L2TP \u7f51\u7edc\u670d\u52a1\u5668\uff09\u4e4b\u95f4\u5efa\u7acb\u903b\u8f91\u4e0a\u7684\u7b2c\u4e8c\u5c42\u8fde\u63a5\u3002\u901a\u8fc7\u521b\u5efa\u8fd9\u79cd\u865a\u62df\u5316\u96a7\u9053\uff0cL2TP \u4f7f\u8fdc\u7a0b\u5ba2\u6237\u7aef\u65e0\u8bba\u8eab\u5904\u4f55\u5730\uff0c\u90fd\u80fd\u8868\u73b0\u5f97\u5982\u540c\u7269\u7406\u8fde\u63a5\u5230\u672c\u5730\u4f01\u4e1a\u7f51\u7edc\u4e00\u6837\u3002\u5b83\u5229\u7528\u63a7\u5236\u901a\u9053\u6765\u7ba1\u7406\u96a7\u9053\u7684\u751f\u547d\u5468\u671f\uff08\u5efa\u7acb\u3001\u7ef4\u62a4\u548c\u62c6\u9664\uff09\uff0c\u5e76\u5229\u7528\u6570\u636e\u901a\u9053\u8fdb\u884c\u5c01\u88c5\u8d1f\u8f7d\u7684\u5b9e\u9645\u4f20\u8f93\u3002\u7136\u800c\uff0c\u4ece\u7eaf\u7cb9\u7684\u4e13\u4e1a\u5b89\u5168\u89d2\u5ea6\u6765\u770b\uff0cL2TP \u6280\u672f\u4e0a\u662f\u201c\u900f\u660e\u201d\u7684\uff1b\u5b83\u63d0\u4f9b\u4e86\u4f20\u8f93\u57fa\u7840\u67b6\u6784\uff0c\u4f46\u7f3a\u4e4f\u5185\u7f6e\u7684\u6570\u636e\u52a0\u5bc6\u6216\u6765\u6e90\u8eab\u4efd\u9a8c\u8bc1\u673a\u5236\u3002\u56e0\u6b64\uff0c\u5b83\u51e0\u4e4e\u5b8c\u5168\u4e0e IPsec \u7ed3\u5408\u4f7f\u7528\uff0c\u6784\u6210 L2TP\/IPsec \u5957\u4ef6\uff0c\u4ece\u800c\u5c06 L2TP \u7684\u96a7\u9053\u7075\u6d3b\u6027\u4e0e Internet \u534f\u8bae\u5b89\u5168\u6846\u67b6\u5f3a\u5927\u7684\u52a0\u5bc6\u5b89\u5168\u6027\u7ed3\u5408\u5728\u4e00\u8d77\u3002<\/p>\n\n\n\n

L2TP \u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f<\/h2>\n\n\n\n
\n \n

\n L2TP \u901a\u8fc7\u5c01\u88c5\u6570\u636e\u5305\uff0c\u5e76\u901a\u8fc7\u5728\u7528\u6237\u8bbe\u5907\u4e0e\u8fdc\u7a0b VPN \u670d\u52a1\u5668\u4e4b\u95f4\u5efa\u7acb\u7684\u4e13\u7528 VPN \u96a7\u9053\u8fdb\u884c\u4f20\u8f93\uff0c\u4ece\u800c\u5b9e\u73b0\u5b89\u5168\u901a\u4fe1\u3002\n <\/p>\n\n

\n
    \n
  • \n 1<\/span>\n \u542f\u52a8 \/ \u53d1\u8d77 (Initiation):<\/strong> \n \u5f53\u7528\u6237\u4f7f\u7528 L2TP \u534f\u8bae\u5411 VPN \u670d\u52a1\u5668\u53d1\u8d77\u8fde\u63a5\u8bf7\u6c42\u65f6\uff0c\u8be5\u8fc7\u7a0b\u6b63\u5f0f\u5f00\u59cb\n <\/li>\n
  • \n 2<\/span>\n \u96a7\u9053\u5efa\u7acb (Tunnel Establishment):<\/strong> \n L2TP \u521b\u5efa\u4e00\u4e2a\u865a\u62df\u96a7\u9053\uff0c\u5145\u5f53\u4e00\u79cd\u4f20\u8f93\u673a\u5236\uff0c\u4e3a\u901a\u8fc7\u4e92\u8054\u7f51\u8fdb\u884c\u6570\u636e\u4f20\u8f93\u505a\u597d\u51c6\u5907\u3002\n <\/li>\n
  • \n 3<\/span>\n \u52a0\u5bc6\uff08IPsec \u96c6\u6210\uff09<\/strong> \n \u7531\u4e8e L2TP \u7f3a\u4e4f\u539f\u751f\u52a0\u5bc6\u529f\u80fd\uff0c\u56e0\u6b64\u91c7\u7528 IPsec \u5957\u4ef6\u5bf9\u6570\u636e\u8fdb\u884c\u52a0\u5bc6\uff0c\u4ece\u800c\u63d0\u4f9b\u5fc5\u8981\u7684\u5b89\u5168\u6027\u53ca\u8eab\u4efd\u9a8c\u8bc1\n <\/li>\n
  • \n 4<\/span>\n \u5b89\u5168\u4f20\u8f93 (Secure Transit):<\/strong> \n \u73b0\u5df2\u52a0\u5bc6\u7684\u6d41\u91cf\u901a\u8fc7\u5efa\u7acb\u597d\u7684\u96a7\u9053\u5728\u516c\u5171\u4e92\u8054\u7f51\u4e2d\u4f20\u8f93\uff0c\u5e76\u53d7\u5230\u4fdd\u62a4\u514d\u53d7\u5916\u90e8\u5a01\u80c1\n <\/li>\n
  • \n 5<\/span>\n \u89e3\u5bc6\u4e0e\u4ea4\u4ed8:<\/strong> \n \u5230\u8fbe\u76ee\u7684\u5730\u540e\uff0cVPN \u670d\u52a1\u5668\u4f1a\u89e3\u5bc6\u8d1f\u8f7d\u6570\u636e\uff0c\u5e76\u5c06\u539f\u59cb\u6d41\u91cf\u8f6c\u53d1\u5230\u9884\u5b9a\u7684\u5185\u90e8\u8d44\u6e90\u6216\u7f51\u7ad9\n <\/li>\n <\/ul>\n <\/div>\n\n

    \n \u5907\u6ce8:<\/strong> \u7531\u4e8e L2TP \u672c\u8eab\u4e0d\u5305\u542b\u52a0\u5bc6\u529f\u80fd\uff0c\u56e0\u6b64\u4f7f\u7528 IPsec \u5bf9\u4e8e\u786e\u4fdd\u7aef\u5230\u7aef\u7684\u6570\u636e\u4fdd\u62a4\u81f3\u5173\u91cd\u8981\n <\/p>\n<\/section>\n\n\n\n

    \"L2TP
    L2TP \u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f<\/figcaption><\/figure>\n\n\n\n

    L2TP \u7684\u5173\u952e\u7279\u6027<\/h2>\n\n\n\n

    \u4e8c\u5c42\u96a7\u9053\u534f\u8bae (L2TP) \u4ee5\u5176\u5f3a\u5927\u7684\u96a7\u9053\u5efa\u7acb\u80fd\u529b\u800c\u8457\u79f0\uff0c\u4e13\u95e8\u7528\u4e8e\u521b\u5efa\u7a33\u5b9a\u7684\u865a\u62df\u5316\u96a7\u9053\uff0c\u4ece\u800c\u4fc3\u8fdb\u7f51\u7edc\u6d41\u91cf\u5728\u516c\u5171\u57fa\u7840\u8bbe\u65bd\u4e0a\u7684\u4f20\u8f93\u3002\u5176\u6838\u5fc3\u4f18\u52bf\u4e4b\u4e00\u662f\u5353\u8d8a\u7684\u8de8\u5e73\u53f0\u517c\u5bb9\u6027\uff1b\u7531\u4e8e L2TP\/IPsec \u5df2\u539f\u751f\u96c6\u6210\u5230\u5305\u62ec Windows\u3001macOS\u3001Linux\u3001Android \u548c iOS \u5728\u5185\u7684\u51e0\u4e4e\u6240\u6709\u4e3b\u6d41\u64cd\u4f5c\u7cfb\u7edf\u4e2d\uff0c\u56e0\u6b64\u5b83\u5386\u6765\u662f\u4f01\u4e1a\u7ea7 VPN \u90e8\u7f72\u7684\u9996\u9009\u3002\u9664\u4e86\u6613\u7528\u6027\u4e4b\u5916\uff0c\u8be5\u534f\u8bae\u901a\u8fc7\u591a\u534f\u8bae\u652f\u6301\u63d0\u4f9b\u4e86\u663e\u8457\u7684\u7075\u6d3b\u6027\uff0c\u4f7f\u5176\u80fd\u591f\u5728\u4e0d\u540c\u73af\u5883\u4e2d\u4f20\u8f93\u5404\u79cd\u7c7b\u578b\u7684\u7f51\u7edc\u6d41\u91cf\u3002\u6b64\u5916\uff0cL2TP \u63d0\u4f9b\u4e86\u5168\u9762\u7684\u8eab\u4efd\u9a8c\u8bc1\u9009\u9879\u5957\u4ef6\uff0c\u652f\u6301 PAP\u3001CHAP\u3001MS-CHAP \u548c EAP \u7b49\u65b9\u6cd5\u3002\u5f53\u4e0e IPsec \u6846\u67b6\u96c6\u6210\u65f6\uff0c\u8fd9\u4e9b\u80fd\u529b\u5f97\u5230\u8fdb\u4e00\u6b65\u589e\u5f3a\uff0c\u5305\u62ec\u57fa\u4e8e\u8bc1\u4e66\u7684\u8eab\u4efd\u9a8c\u8bc1\uff0c\u4ece\u800c\u786e\u4fdd\u4e86\u9ad8\u5ea6\u7684\u8eab\u4efd\u9a8c\u8bc1\u548c\u4f1a\u8bdd\u5b8c\u6574\u6027\u3002<\/p>\n\n\n\n

    \n
    \n \n \n
    \n

    \n \u25b2<\/span> L2TP\/IPsec \u7684\u4f18\u52bf\n <\/h2>\n \n
    \n

    \u914d\u5408 IPsec \u7684\u5f3a\u5b89\u5168\u6027<\/h3>\n

    \u5f53\u4e0e IPsec \u7ed3\u5408\u4f7f\u7528\u65f6\uff0cL2TP \u53ef\u63d0\u4f9b\u53ef\u9760\u7684\u52a0\u5bc6\u548c\u8eab\u4efd\u9a8c\u8bc1\u6807\u51c6\uff0c\u8fd9\u88ab\u8ba4\u4e3a\u8db3\u4ee5\u4fdd\u969c\u8bb8\u591a\u4f01\u4e1a\u7ea7\u5e94\u7528\u7684\u5b89\u5168<\/p>\n <\/div>\n\n

    \n

    \u5e7f\u6cdb\u652f\u6301<\/h3>\n

    \u5927\u591a\u6570\u4e3b\u6d41\u64cd\u4f5c\u7cfb\u7edf\u90fd\u5305\u542b\u539f\u751f\u652f\u6301\uff0c\u8fd9\u610f\u5473\u7740\u7528\u6237\u901a\u5e38\u4e0d\u9700\u8981\u5b89\u88c5\u989d\u5916\u7684\u7b2c\u4e09\u65b9\u8f6f\u4ef6<\/p>\n <\/div>\n\n

    \n

    \u7a33\u5b9a\u7684\u8fde\u63a5<\/h3>\n

    L2TP \u4ee5\u5728\u5404\u79cd\u590d\u6742\u7684\u7f51\u7edc\u73af\u5883\u4e2d\u7ef4\u6301\u53ef\u9760\u4e14\u4e00\u81f4\u7684 VPN \u8fde\u63a5\u800c\u95fb\u540d<\/p>\n <\/div>\n\n

    \n

    \u6613\u4e8e\u90e8\u7f72<\/h3>\n

    \u7531\u4e8e\u539f\u751f\u652f\u6301\u975e\u5e38\u666e\u904d\uff0c\u65e0\u8bba\u662f\u5bf9\u4e8e\u4f01\u4e1a\u8fd8\u662f\u4e2a\u4eba\u7528\u6237\uff0c\u914d\u7f6e L2TP\/IPsec \u90fd\u76f8\u5bf9\u7b80\u5355\u76f4\u63a5<\/p>\n <\/div>\n <\/section>\n\n \n

    \n

    \n \u25bc<\/span> L2TP\/IPsec \u7684\u7f3a\u70b9\n <\/h2>\n\n
    \n

    \u901f\u5ea6\u8f83\u6162<\/h3>\n

    L2TP\/IPsec \u91c7\u7528\u53cc\u91cd\u5c01\u88c5\u6280\u672f\uff0c\u8fd9\u4f1a\u663e\u8457\u589e\u52a0\u5f00\u9500\uff0c\u5e76\u4e14\u4e0e\u73b0\u4ee3\u534f\u8bae\u76f8\u6bd4\u53ef\u80fd\u4f1a\u964d\u4f4e\u901f\u5ea6<\/p>\n <\/div>\n\n

    \n

    \u9632\u706b\u5899\u9650\u5236<\/h3>\n

    \u901a\u5e38\u4f7f\u7528 UDP \u7aef\u53e3 500 \u548c 4500\uff0c\u8fd9\u4e9b\u7aef\u53e3\u7ecf\u5e38\u6210\u4e3a\u9650\u5236\u6027\u9632\u706b\u5899\u6216 ISP\uff08\u4e92\u8054\u7f51\u670d\u52a1\u63d0\u4f9b\u5546\uff09\u62e6\u622a\u548c\u5c01\u9501\u7684\u76ee\u6807<\/p>\n <\/div>\n\n

    \n

    \u65e0\u5185\u7f6e\u52a0\u5bc6<\/h3>\n

    L2TP \u672c\u8eab\u5e76\u4e0d\u5bf9\u6d41\u91cf\u8fdb\u884c\u52a0\u5bc6\uff1b\u5b83\u4ec5\u5145\u5f53\u96a7\u9053\uff0c\u56e0\u6b64\u82e5\u8981\u5b89\u5168\u4f7f\u7528\uff0c\u5fc5\u987b\u96c6\u6210 IPsec<\/p>\n <\/div>\n\n

    \n

    \u9648\u65e7\u7684\u66ff\u4ee3\u65b9\u6848<\/h3>\n

    \u8bf8\u5982 WireGuard \u548c OpenVPN \u4e4b\u7c7b\u7684\u8f83\u65b0\u534f\u8bae\u63d0\u4f9b\u4e86\u66f4\u597d\u7684\u6027\u80fd\u3001\u66f4\u9ad8\u7684\u6548\u7387\u4ee5\u53ca\u66f4\u7b80\u5355\u3001\u66f4\u73b0\u4ee3\u7684\u914d\u7f6e\u65b9\u5f0f<\/p>\n <\/div>\n <\/section>\n \n <\/div>\n<\/div>\n\n\n\n

    L2TP \u5b89\u5168\u5417\uff1f<\/h2>\n\n\n\n

    L2TP \u7684\u5b89\u5168\u6027\u662f\u4e00\u4e2a\u5fae\u5999\u7684\u8bdd\u9898\uff0c\u56e0\u4e3a\u8be5\u534f\u8bae\u672c\u8eab\u5e76\u4e0d\u5177\u5907\u5185\u7f6e\u7684\u6570\u636e\u52a0\u5bc6\u529f\u80fd\uff0c\u56e0\u6b64\u5176\u672c\u8d28\u4e0a\u5e76\u4e0d\u5b89\u5168\u3002\u7136\u800c\uff0c\u5f53 L2TP \u4e0e IPsec \u7ed3\u5408\u4f7f\u7528\u65f6\uff0c\u53ea\u8981\u5b9e\u73b0\u548c\u914d\u7f6e\u5f97\u5f53\uff0c\u901a\u5e38\u88ab\u8ba4\u4e3a\u662f\u4e00\u4e2a\u5b89\u5168\u7684\u89e3\u51b3\u65b9\u6848\u3002L2TP\/IPsec \u8fde\u63a5\u7684\u6574\u4f53\u5b8c\u6574\u6027\u5f88\u5927\u7a0b\u5ea6\u4e0a\u53d6\u51b3\u4e8e\u51e0\u4e2a\u5173\u952e\u56e0\u7d20\uff0c\u5305\u62ec\u4f7f\u7528\u5f3a\u52a0\u5bc6\u7b97\u6cd5\u3001\u5e94\u7528\u53ef\u9760\u7684\u8eab\u4efd\u9a8c\u8bc1\u65b9\u6cd5\uff0c\u4ee5\u53ca\u5728\u6b63\u786e\u7684 IPsec \u914d\u7f6e\u4e0b\u7ef4\u62a4\u66f4\u65b0\u7684\u8f6f\u4ef6\u5b9e\u73b0\u3002\u5c3d\u7ba1\u6709\u7740\u8fd9\u4e9b\u7a33\u5065\u7684\u5b89\u5168\u6807\u51c6\uff0c\u884c\u4e1a\u5185\u4ecd\u5728\u53d1\u751f\u8f6c\u53d8\uff1b\u8bb8\u591a VPN \u670d\u52a1\u5546\u73b0\u5728\u5f00\u59cb\u4f18\u5148\u91c7\u7528 WireGuard \u548c OpenVPN \u7b49\u73b0\u4ee3\u534f\u8bae\u3002\u8fd9\u4e9b\u8f83\u65b0\u7684\u66ff\u4ee3\u65b9\u6848\u5f80\u5f80\u66f4\u53d7\u9752\u7750\uff0c\u56e0\u4e3a\u5b83\u4eec\u5728\u4e0d\u635f\u5bb3\u7528\u6237\u6240\u671f\u671b\u7684\u5b89\u5168\u6c34\u5e73\u7684\u524d\u63d0\u4e0b\uff0c\u63d0\u4f9b\u4e86\u663e\u8457\u63d0\u5347\u7684\u901f\u5ea6\u548c\u6548\u7387\u3002<\/p>\n\n\n\n

    L2TP \u4e0e\u5176\u4ed6 VPN \u534f\u8bae\uff1a\u6280\u672f\u5bf9\u6bd4<\/h2>\n\n\n\n

    \u5728\u5c06 L2TP \u4e0e\u5176\u524d\u8eab PPTP \u8fdb\u884c\u8bc4\u4f30\u5bf9\u6bd4\u65f6\uff0c\u6700\u5173\u952e\u7684\u533a\u522b\u5728\u4e8e\u5b83\u4eec\u7684\u5b89\u5168\u6027\u548c\u53ef\u9760\u6027\u3002\u867d\u7136\u8fd9\u4e24\u79cd\u534f\u8bae\u6709\u7740\u5171\u540c\u7684\u5386\u53f2\u6e0a\u6e90\uff0c\u4e14\u90fd\u5177\u5907\u6781\u9ad8\u7684\u8bbe\u5907\u517c\u5bb9\u6027\uff0c\u4f46 PPTP \u5982\u4eca\u7531\u4e8e\u52a0\u5bc6\u6807\u51c6\u5b58\u5728\u6f0f\u6d1e\uff0c\u5df2\u57fa\u672c\u88ab\u5f03\u7528\u5e76\u88ab\u89c6\u4e3a\u4e0d\u5b89\u5168\u3002\u76f8\u6bd4\u4e4b\u4e0b\uff0cL2TP\/IPsec \u901a\u8fc7\u5f3a\u52a0\u5bc6\u63d0\u4f9b\u4e86\u7a33\u5065\u7684\u5b89\u5168\u5c42\uff0c\u5e76\u4fdd\u6301\u4e86\u4e2d\u7b49\u6c34\u5e73\u7684\u901f\u5ea6\uff0c\u5bf9\u4e8e\u90a3\u4e9b\u4f7f\u7528 PPTP \u4f1a\u5e26\u6765\u91cd\u5927\u5b89\u5168\u98ce\u9669\u7684\u9057\u7559\u7cfb\u7edf\u6765\u8bf4\uff0c\u5b83\u662f\u4e00\u4e2a\u53ef\u9760\u7684\u66ff\u4ee3\u65b9\u6848\u3002<\/p>\n\n\n\n

    \u5728 L2TP \u4e0e OpenVPN \u7684\u535a\u5f08\u4e2d\uff0c\u540e\u8005\u51ed\u501f\u5176\u7075\u6d3b\u6027\u548c\u5f00\u6e90\u57fa\u7840\u8131\u9896\u800c\u51fa\uff0c\u5e76\u5728\u6280\u672f\u793e\u533a\u4e2d\u8d62\u5f97\u4e86\u5e7f\u6cdb\u4fe1\u4efb\u3002\u5c3d\u7ba1\u8fd9\u4e24\u79cd\u534f\u8bae\u90fd\u80fd\u63d0\u4f9b\u9ad8\u5f3a\u5ea6\u5b89\u5168\u6027\u548c\u5e73\u8861\u7684\u901f\u5ea6\uff0c\u4f46 OpenVPN \u5728\u7ed5\u8fc7\u9650\u5236\u6027\u9632\u706b\u5899\u65b9\u9762\u8981\u6709\u6548\u5f97\u591a\uff0c\u800c L2TP \u5728\u9ad8\u5ea6\u53d7\u63a7\u7684\u7f51\u7edc\u73af\u5883\u4e2d\u5f80\u5f80\u8868\u73b0\u6323\u624e\u3002\u867d\u7136 L2TP \u5728\u5927\u591a\u6570\u64cd\u4f5c\u7cfb\u7edf\u4e0a\u901a\u5e38\u66f4\u5bb9\u6613\u8fdb\u884c\u539f\u751f\u914d\u7f6e\uff0c\u4f46\u5bf9\u4e8e\u9700\u8981\u9ad8\u5ea6\u9002\u5e94\u6027\u548c\u201c\u6781\u5f3a\u201d\u5b89\u5168\u6846\u67b6\u7684\u7528\u6237\u6765\u8bf4\uff0cOpenVPN \u4ecd\u7136\u662f\u9996\u9009\u6807\u51c6\u3002<\/p>\n\n\n\n

    \u6700\u7ec8\uff0cWireGuard \u7684\u5174\u8d77\u6807\u5fd7\u7740\u5411\u73b0\u4ee3\u4f18\u5316\u7684\u91cd\u5927\u8f6c\u53d8\uff0c\u5b83\u540c\u65f6\u517c\u987e\u4e86\u901f\u5ea6\u548c\u67b6\u6784\u7684\u7b80\u6d01\u6027\u3002\u4e0e\u65e5\u76ca\u9648\u65e7\u7684 L2TP\/IPsec \u6807\u51c6\u76f8\u6bd4\uff0cWireGuard \u91c7\u7528\u4e86\u590d\u6742\u6027\u663e\u8457\u964d\u4f4e\u7684\u8f7b\u91cf\u7ea7\u4ee3\u7801\u5e93\uff0c\u4ece\u800c\u4e3a\u79fb\u52a8\u7528\u6237\u5e26\u6765\u4e86\u6781\u5feb\u7684\u901f\u5ea6\u548c\u66f4\u9ad8\u7684\u7535\u6c60\u6548\u7387\u3002\u867d\u7136 L2TP\/IPsec \u4ecd\u662f\u4e00\u4e2a\u5b89\u5168\u4e14\u53ef\u9760\u7684\u9057\u7559\u9009\u9879\uff0c\u4f46 WireGuard \u51ed\u501f\u5176\u5353\u8d8a\u7684\u6027\u80fd\u548c\u5c16\u7aef\u7684\u52a0\u5bc6\u5f3a\u5ea6\uff0c\u6b63\u8fc5\u901f\u6210\u4e3a\u73b0\u4ee3 VPN \u670d\u52a1\u7684\u884c\u4e1a\u6807\u6746\u3002<\/p>\n\n\n\n

    \n

    \u6280\u672f\u5e38\u89c1\u95ee\u9898\u89e3\u7b54 (FAQ)\uff1a\u7b2c\u4e8c\u5c42\u96a7\u9053\u534f\u8bae (L2TP)<\/h2>\n \n \n
    \n

    \n Q:<\/span>\n L2TP\/IPsec \u7684\u5177\u4f53\u7aef\u53e3\u8981\u6c42\u662f\u4ec0\u4e48\uff1f\n <\/h3>\n
    \n

    A\uff1a \u6807\u51c6\u7684 L2TP\/IPsec \u5b9e\u73b0\u9700\u8981\u5f00\u653e\u4e09\u4e2a\u7279\u5b9a\u7aef\u53e3\uff1a\u7528\u4e8e IKE\uff08\u4e92\u8054\u7f51\u5bc6\u94a5\u4ea4\u6362\uff09\u7684 UDP \u7aef\u53e3 500\u3001\u7528\u4e8e NAT \u7a7f\u8d8a\uff08NAT Traversal\uff09\u7684 UDP \u7aef\u53e3 4500\uff0c\u4ee5\u53ca\u7528\u4e8e L2TP \u6d41\u91cf\u672c\u8eab\u7684 UDP \u7aef\u53e3 1701\u3002\u786e\u4fdd\u9632\u706b\u5899\u5141\u8bb8\u8fd9\u4e9b\u7aef\u53e3\u901a\u8fc7\uff0c\u5bf9\u4e8e\u6210\u529f\u5efa\u7acb\u96a7\u9053\u81f3\u5173\u91cd\u8981\u3002<\/p>\n <\/div>\n <\/div>\n\n \n

    \n

    \n Q:<\/span>\n \u53cc\u91cd\u5c01\u88c5\u5982\u4f55\u5f71\u54cd\u6700\u5927\u4f20\u8f93\u5355\u5143 (MTU)\uff1f\n <\/h3>\n
    \n

    \u7531\u4e8e L2TP\/IPsec \u4f1a\u5c06\u6570\u636e\u5c01\u88c5\u5728 L2TP \u548c IPsec \u62a5\u5934\u4e2d\uff0c\u8fd9\u4f1a\u7ed9\u6bcf\u4e2a\u6570\u636e\u5305\u589e\u52a0\u663e\u8457\u7684\u5f00\u9500\u3002\u8fd9\u901a\u5e38\u9700\u8981\u51cf\u5c0f MTU \u5927\u5c0f\uff08\u901a\u5e38\u964d\u81f3 1400 \u6216 1280 \u5b57\u8282\uff09\u4ee5\u9632\u6b62\u6570\u636e\u5305\u5206\u7247\uff0c\u5426\u5219\u53ef\u80fd\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u6216\u8fde\u63a5\u4e2d\u65ad\u3002<\/p>\n <\/div>\n <\/div>\n\n \n

    \n

    \n Q:<\/span>\n L2TP \u8bbf\u95ee\u96c6\u4e2d\u5668 (LAC) \u548c L2TP \u7f51\u7edc\u670d\u52a1\u5668 (LNS) \u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f\n <\/h3>\n
    \n

    LAC \u662f\u7269\u7406\u4e0a\u7ec8\u6b62\u6765\u81ea\u7528\u6237\u7684\u547c\u53eb\u6216\u8fde\u63a5\u5e76\u5c06\u6d41\u91cf\u96a7\u9053\u4f20\u8f93\u81f3 LNS \u7684\u8bbe\u5907\u3002LNS \u662f L2TP \u4f1a\u8bdd\u7684\u903b\u8f91\u7ec8\u6b62\u70b9\uff0c\u5728\u6b64\u5904 PPP \u5e27\u88ab\u89e3\u5c01\u88c5\u5e76\u8fdb\u884c\u5904\u7406\uff0c\u4ee5\u5b9e\u73b0\u5bf9\u5185\u90e8\u7f51\u7edc\u7684\u8bbf\u95ee\u3002<\/p>\n <\/div>\n <\/div>\n\n \n

    \n

    \n Q:<\/span>\n \u4e3a\u4ec0\u4e48\u5728\u5b89\u5168\u5ba1\u8ba1\u4e2d L2TP \u88ab\u89c6\u4e3a\u4e00\u79cd\u201c\u900f\u660e\u201d\u534f\u8bae\uff1f\n <\/h3>\n
    \n

    \u5728\u6280\u672f\u5ba1\u8ba1\u4e2d\uff0cL2TP \u88ab\u6807\u8bb0\u4e3a\u201c\u900f\u660e\u201d\uff0c\u662f\u56e0\u4e3a\u5b83\u4ec5\u63d0\u4f9b\u96a7\u9053\u7ed3\u6784\uff0c\u800c\u4e0d\u5bf9\u6709\u6548\u8f7d\u8377\u8fdb\u884c\u4fee\u6539\u6216\u4fdd\u62a4\u3002\u5b83\u4e25\u683c\u8d1f\u8d23\u4f1a\u8bdd\u5c42\u7684\u79fb\u52a8\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5b89\u5168\u4e13\u4e1a\u4eba\u58eb\u5f3a\u5236\u8981\u6c42\u4f7f\u7528 IPsec\uff0c\u4ee5\u63d0\u4f9b L2TP \u6240\u7f3a\u4e4f\u7684\u52a0\u5bc6\u5c42\u3002<\/p>\n <\/div>\n <\/div>\n\n \n

    \n

    \n Q:<\/span>\n L2TP \u662f\u5426\u652f\u6301\u9664 IP \u4ee5\u5916\u7684\u591a\u534f\u8bae\u6d41\u91cf\uff1f\n <\/h3>\n
    \n

    \u662f\u7684\u3002L2TP \u663e\u8457\u7684\u6280\u672f\u4f18\u52bf\u4e4b\u4e00\u662f\u5b83\u80fd\u591f\u96a7\u9053\u4f20\u8f93\u5404\u79cd\u534f\u8bae\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f IP\u3002\u7531\u4e8e\u5b83\u5c01\u88c5\u4e86 PPP \u5e27\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f20\u8f93 PPP \u652f\u6301\u7684\u4efb\u4f55\u534f\u8bae\uff0c\u4ece\u800c\u5728\u9057\u7559\u7cfb\u7edf\u6216\u7279\u6b8a\u7684\u4f01\u4e1a\u7f51\u7edc\u73af\u5883\u4e2d\u63d0\u4f9b\u66f4\u5927\u7684\u7075\u6d3b\u6027\u3002<\/p>\n <\/div>\n <\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"

    L2TP (Layer 2 Tunneling Protocol) is a session-layer networking protocol that serves as a fundamental building block for Virtual Private Networks (VPNs). Formally defined in RFC 2661, it operates primarily at the Data Link Layer (Layer 2) of the OSI model, though it is often carried over UDP port 1701 in modern IP networks. Its technical essence lies in its ability to encapsulate Point-to-Point Protocol (PPP) frames, allowing them to be tunneled across diverse and potentially incompatible underlying networks\u2014such as IP, Frame Relay, or ATM\u2014thereby extending a logical Layer 2 connection between a LAC (L2TP Access Concentrator) and a LNS (L2TP Network Server).By creating this virtualized tunnel, L2TP enables a remote client to appear as if it is physically connected to a local corporate network, regardless of its geographic location. It utilizes a control channel to manage the lifecycle of the tunnel (establishment, maintenance, and teardown) and a data channel for the actual transmission of encapsulated payloads. However, from a purely professional security perspective, L2TP is technically transparent; it provides the infrastructure for the journey but lacks built-in mechanisms for data encryption or origin authentication. Consequently, it is almost exclusively deployed in conjunction with IPsec to form the L2TP\/IPsec suite, which leverages the tunneling flexibility of L2TP alongside the robust cryptographic security of the Internet Protocol Security framework. How Does L2TP Work? L2TP facilitates secure communication by encapsulating data packets and transmitting them through a specialized VPN tunnel established between the user\u2019s device and a remote VPN server. 1 Initiation: The process begins when a user initiates a connection request to a VPN server using the L2TP protocol. 2 Tunnel Establishment: L2TP creates a virtual tunnel, acting as a delivery mechanism that prepares the data for transmission across the internet. 3 Encryption (IPsec Integration): Since L2TP lacks native encryption, the IPsec suite is employed to encrypt the data, providing the necessary security and identity authentication. 4 Secure Transit: The now-encrypted traffic travels through the established tunnel across the public internet, shielded from external threats. 5 Decryption and Delivery: Upon reaching its destination, the VPN server decrypts the payload and forwards the original traffic to the intended internal resource or website. Note: Because L2TP does not include encryption by itself, the use of IPsec is essential for ensuring end-to-end data protection. Key Features of L2TP The Layer 2 Tunneling Protocol (L2TP) is distinguished by its robust tunneling capabilities, specializing in the creation of stable, virtualized tunnels that facilitate the transmission of network traffic across public infrastructures. One of its primary strengths is its exceptional cross-platform compatibility; because L2TP\/IPsec is natively integrated into almost all major operating systems\u2014including Windows, macOS, Linux, Android, and iOS\u2014it has historically been a preferred choice for enterprise-level VPN deployments. Beyond accessibility, the protocol offers significant flexibility through its multi-protocol support, allowing it to transport diverse types of network traffic across varying environments. Furthermore, L2TP provides a comprehensive suite of authentication options, supporting methods such as PAP, CHAP, MS-CHAP, and EAP. When integrated with the IPsec framework, these capabilities are further enhanced to include certificate-based authentication, ensuring a high degree of identity verification and session integrity. \u25b2 Advantages of L2TP\/IPsec Strong Security with IPsec When combined with IPsec, L2TP offers solid encryption and authentication standards that are considered secure for many enterprise applications. Widely Supported Most major operating systems include native support, meaning users often do not need to install additional third-party software. Stable Connections L2TP is renowned for maintaining reliable and consistent VPN connections across various complex network environments. Easy Deployment Because native support is common, configuring L2TP\/IPsec is relatively straightforward for both businesses and individual users. \u25bc Disadvantages of L2TP\/IPsec Slower Speeds L2TP\/IPsec utilizes double encapsulation, which significantly increases overhead and can reduce speeds compared to modern protocols. Firewall Restrictions Commonly uses UDP ports 500 and 4500, which are frequently targeted and blocked by restrictive firewalls or ISPs. No Built-In Encryption L2TP alone does not encrypt traffic; it acts only as a tunnel, making the integration of IPsec mandatory for any secure usage. Outdated Alternatives Newer protocols like WireGuard and OpenVPN provide better performance, improved efficiency, and much simpler modern configurations. Is L2TP Secure? The security of L2TP is a nuanced topic because the protocol is not inherently secure on its own, as it lacks built-in data encryption capabilities. However, when L2TP is paired with IPsec, it is generally considered to be a secure solution, provided that it is implemented and configured correctly. The overall integrity of a L2TP\/IPsec connection depends heavily on several critical factors, including the use of strong encryption algorithms, the application of reliable authentication methods, and the maintenance of updated software implementations alongside a correct IPsec configuration. Despite these robust security standards, a shift is occurring in the industry; many VPN providers are now prioritizing modern protocols such as WireGuard and OpenVPN. These newer alternatives are often favored because they offer significantly improved speed and efficiency without compromising the security levels that users expect. L2TP vs. Other VPN Protocols: A Technical Comparison When evaluating L2TP against its predecessor, PPTP, the most critical distinctions are found in their security and reliability profiles. While both protocols share a historical lineage and boast high device compatibility, PPTP is now largely deprecated and deemed insecure due to its vulnerable encryption standards. In contrast, L2TP\/IPsec offers a robust security layer through strong encryption and maintains moderate speeds, serving as a reliable alternative for legacy systems where PPTP would pose a significant security risk. In the debate between L2TP and OpenVPN, the latter stands out for its flexibility and open-source foundation, which has earned it widespread trust within the tech community. Although both protocols deliver strong security and balanced speeds, OpenVPN is far more effective at bypassing restrictive firewalls, whereas L2TP often struggles in highly controlled network environments. While L2TP is generally easier to configure natively on most operating systems, OpenVPN remains the preferred standard for users requiring a highly adaptable and “very strong” security framework. Ultimately, the rise of WireGuard signifies a major shift toward modern<\/p>","protected":false},"author":1,"featured_media":610,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"What Is L2TP? Layer 2 Tunneling Protocol Explained, Security, IPsec & VPN Guide","_seopress_titles_desc":"Learn what L2TP (Layer 2 Tunneling Protocol) is, how L2TP\/IPsec works, its security features, advantages, disadvantages, ports, and comparisons with OpenVPN, PPTP, and WireGuard.","_seopress_robots_index":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-607","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-post"],"acf":[],"_links":{"self":[{"href":"https:\/\/rocketspacevpn.com\/zh\/wp-json\/wp\/v2\/posts\/607","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rocketspacevpn.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rocketspacevpn.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rocketspacevpn.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rocketspacevpn.com\/zh\/wp-json\/wp\/v2\/comments?post=607"}],"version-history":[{"count":6,"href":"https:\/\/rocketspacevpn.com\/zh\/wp-json\/wp\/v2\/posts\/607\/revisions"}],"predecessor-version":[{"id":620,"href":"https:\/\/rocketspacevpn.com\/zh\/wp-json\/wp\/v2\/posts\/607\/revisions\/620"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rocketspacevpn.com\/zh\/wp-json\/wp\/v2\/media\/610"}],"wp:attachment":[{"href":"https:\/\/rocketspacevpn.com\/zh\/wp-json\/wp\/v2\/media?parent=607"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rocketspacevpn.com\/zh\/wp-json\/wp\/v2\/categories?post=607"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rocketspacevpn.com\/zh\/wp-json\/wp\/v2\/tags?post=607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}