\u5176\u5b9e\u8fd9\u662f\u4e00\u7bc7\u8bb2\u89e3\u5229\u7528\u4e2d\u56fd\u79fb\u52a8CMWAP\u7684\u4e00\u4e9b\u7279\u6027\u6765\u5b9e\u73b0\u514d\u8d39\u4e0a\u7f51\u7684\u535a\u6587\uff0c\u4f46\u662f\u6ca1\u6709\u4ee5\u8fd9\u4e2a\u4e3a\u6807\u9898\uff0c\u56e0\u4e3a
\n1\u3001\u7528\u7684\u662f2G\u7684EDGE\u7f51\u7edc\uff0c\u8ddf2G\u624b\u673a\u4e0a\u7f51\u4e00\u6837\uff0c\u901f\u5ea6\u6709\u9650.
\n2\u3001\u5404\u5730\u533a\u7684\u79fb\u52a8\u8bbe\u5907\u6709\u5dee\u522b\uff0c\u4f8b\u5982\u5728\u5e7f\u5dde\uff0c\u8fd9\u79cd\u65b9\u6cd5\u884c\u4e0d\u901a\u3002\u4f46\u662f\u5e7f\u5dde\u7684\u79fb\u52a8Wifi\u662f\u53ef\u4ee5\u901a\u8fc7UDP\u5efa\u7acbVPN\u6765\u514d\u8d39\u4f7f\u7528\u7684\u3002
\n3\u3001\u4e0d\u60f3\u5438\u5f15\u592a\u591a\u4eba\u7684\u6ce8\u610f\u3002<\/p>\n
\u6211\u89c1\u8fc7\u5f88\u591a\u516c\u5171\u7f51\u7edc\u90fd\u5bf9UDP\u548cTCP\u6709\u4e0d\u5c11\u9650\u5236\uff0c\u4ee5\u81f4\u4e8e\u6211\u4eec\u4e0d\u80fd\u81ea\u7531\u5730\u8bbf\u95ee\u4e92\u8054\u7f51\u3002\u4e3a\u4e86\u6446\u8131\u8fd9\u79cd\u675f\u7f1a\uff0c\u5f88\u591a\u4eba\u90fd\u4e3a\u6b64\u4ed8\u51fa\u4e86\u5f88\u591a\u52aa\u529b\uff0c\u4f8b\u5982\u5404\u79cd\u4ee3\u7406\u8f6f\u4ef6\uff0c\u5404\u79cd\u96a7\u9053\uff0c\u5404\u79cdVPN\u7b49\u3002\u672c\u6587\u4ecb\u7ecd\u7684\u662f\u4e00\u79cd\u6bd4\u8f83\u7f55\u89c1\u7684ICMP\u96a7\u9053\u65b9\u5f0f\u5efa\u7acbVPN\u3002
\n\u80cc\u666f
\n\u4e00\u5e74\u524d\uff0c\u56e0\u4e3a\u5728\u53bf\u57ce\u91cc\u6ca1\u6709\u7f51\u7edc\u4f7f\u7528\uff0c\u53c8\u4e0d\u60f3\u665a\u4e0a\u8dd1\u5230\u5916\u9762\u4e0a\uff0c\u6240\u4ee5\u7ecf\u5e38\u4f7f\u7528\u7b14\u8bb0\u672c\u8fde\u63a5\u624b\u673a\u7684GPRS\u7f51\u7edc\u6765\u4e0a\u7f51\u3002\u6253\u5f00\u4e00\u4e9b\u7f51\u9875\u6216\u8005\u804a\u5929\u5de5\u5177\u4e4b\u7c7b\u7684\uff0c\u7f51 \u901f\u7684\u5feb\u6162\u5e76\u4e0d\u662f\u5f88\u91cd\u8981\u3002\u4f46\u662f\u6d41\u91cf\u6709\u9650\uff0c\u5f53\u65f6\u5f00\u901a\u4e86300MB\u7684\u5957\u9910\u4e5f\u5f88\u5feb\u88ab\u6d88\u8017\u5c3d\u4e86\u3002\u6709\u4e00\u6b21\uff0c\u5728Ubuntu\u4e0b\u521b\u5efa\u4e86\u4e00\u4e2acmwap\u7f51\u7edc\uff0ccmwap\u662f\u9700 \u8981\u8bbe\u7f6e\u4ee3\u7406IP\u4e3a10.0.0.172\u624d\u80fd\u4e0a\u7f51\u7684\u3002\u4f46\u662f\u5947\u602a\u7684\u662f\uff0c\u6211\u7adf\u7136\u53ef\u4ee5ping\u901a\u6211\u81ea\u5df1\u535a\u5ba2\u670d\u52a1\u5668\u7684IP\u3002\u6240\u4ee5\u6211\u60f3cmwap\u5bf9\u5916\u7f51IP\u7684\u8bbf\u95ee\u53ea\u662f \u9650\u5236\u4e86TCP\u548cUDP\u7c7b\u578b\u7684\u6570\u636e\u5305\u8fdb\u51fa\u800c\u5df2\u3002<\/p>\n
\u4e3a\u4e86\u9a8c\u8bc1\u6211\u7684\u60f3\u6cd5\u662f\u5426\u6b63\u786e\uff0c\u6211\u5728\u7f51\u4e0a\u67e5\u627e\u5230\u4e86\u4e00\u4e9b\u73b0\u6210\u7684Ping Tunnel\u5de5\u5177\uff0c\u4f8b\u5982ptunnel\u3002ptunnel\u81f3\u4eca\u8fd8\u53ef\u4ee5\u4f7f\u7528\uff0c\u4f46\u662f\u95ee\u9898\u5f88\u591a\uff0c\n<\/code><\/pre>\n1\u3001ptunnel\u53ea\u652f\u6301TCP\u3002
\n2\u3001\u6211\u4f7f\u7528\u4e86ptunnel\u4e4b\u540e\uff0c\u6211ping\u4e0d\u4e86\u81ea\u5df1\u7684\u670d\u52a1\u5668\u4e86\u3002\u663e\u7136ptunnel\u622a\u83b7\u4e86\u6240\u6709ping\u5305\u3002\uff08\u6216\u8005\u6211\u7528\u7684\u7248\u672c\u592a\u4f4e\uff1f\uff09
\n3\u3001\u901f\u5ea6\u4e0d\u7a33\u5b9a\uff0c\u53ef\u80fd\u662f\u56e0\u4e3a\u81ea\u5df1\u5b9e\u73b0\u7684\u53ef\u9760\u534f\u8bae\u4e0d\u662f\u5f88\u5b8c\u5584\uff1f
\n\u7528cmwap\u8fde\u63a5\u540e\uff0c\u6211\u4f7f\u7528ptunnel\u4ece\u6211\u535a\u5ba2\u4e0a\u4e0b\u8f7d\u4e00\u4e2a5MB\u5927\u5c0f\u7684\u6587\u4ef6\u3002\u7136\u540e\u7528\u624b\u673a\u67e5\u8be2\u6d41\u91cf\uff0c\u53d1\u73b0\u6ca1\u6709\u5c11\u3002
\n \u7531\u6b64\u8bf4\u660e\uff0c\u79fb\u52a8\u7684cmwap\u662f\u4e0d\u8ba1\u7b97ping\u7684\u6d41\u91cf\u7684\u3002\u540c\u65f6\u53ef\u4ee5\u5927\u80c6\u731c\u6d4b\uff0c\u6d41\u91cf\u8ba1\u8d39\u529f\u80fd\u5e94\u8be5\u662f\u572810.0.0.172\u7684\u4ee3\u7406\u670d\u52a1\u5668\u4e0a\u8fdb\u884c\u7684\u3002\u8fd9\u5c31\u662f\u4e3a\u4f55\u8bbf\u95ee\u79fb\u52a8\u7684\u4e00\u4e9b\u670d\u52a1\uff08\u4f8b\u5982\u98de\u4fe1\u7f51\u7ad9\uff09\u4e0d\u4f1a\u6536\u6d41\u91cf\u8d39\u7684\u539f\u56e0\u3002
\n\u6211\u5728\u56fd\u5185\u4f3c\u4e4e\u8fd8\u6ca1\u6709\u641c\u7d22\u5230\u6709\u6587\u7ae0\u5173\u4e8e\u8fd9\u65b9\u9762\u7684\u4ecb\u7ecd\u3002\u540c\u65f6\u6211\u5728\u5e7f\u5dde\u7528cmwap\u8fde\u63a5\u540e\uff0c\u65e0\u6cd5\u53d1\u9001ping\u5305\uff0c\u96be\u9053\u662f\u8fd9\u4e2a\u6f0f\u6d1e\u4fee\u8865\u4e86\uff1f\u6709\u5174\u8da3\u7684\u670b\u53cb\u53ef\u4ee5 \u5728\u81ea\u5df1\u7684\u5730\u533a\u6d4b\u8bd5\u4e00\u4e0b\u3002\u5148\u628a\u8fde\u63a5\u65b9\u5f0f\u66f4\u6539\u4e3acmwap\uff0c\u7136\u540e\u8fde\u4e0a\u540e\uff0cping\u4e00\u4e0b8.8.8.8\uff0c\u770b\u662f\u5426\u6536\u5230pong\uff01\uff01\uff01\u5982\u679c\u80fd\u6536\u5230\uff0c\u606d\u559c\uff01\u4f60\u53ef\u4ee5\u5229\u7528 \u6b64\u7279\u6027\u514d\u8d39\u4e0a\u7f51\u3002\uff08\u53e6\u5916\uff0c\u79fb\u52a8\u7684\u8def\u7531\u5f88\u591a\uff0c\u6bcf\u6b21\u8fde\u63a5\u540e\u5f97\u5230\u7684IP\u90fd\u4e0d\u4e00\u6837\uff0c\u8def\u7531\u4e5f\u4e0d\u4e00\u5b9a\u4e00\u6837\u3002\u591a\u6362\u51e0\u6b21IP\uff0c\u53ef\u4ee5\u5f97\u5230\u80fd\u591fping\u7684\u8def\u7531\u3002——2012\u5e74 1\u670829\u65e5\u8865\u5145\uff09
\n\u6211\u53d1\u73b0\u8fd9\u4e2a\u95ee\u9898\u540e\u672c\u6765\u6253\u7b97\u53d1\u535a\u6587\u7684\uff0c\u540e\u6765\u4e0d\u77e5\u9053\u4e3a\u4f55\u5fd8\u8bb0\u4e86\u3002\u53ea\u662f\u5076\u5c14\u8ddf\u8eab\u8fb9\u4e00\u4e9b\u670b\u53cb\u8bf4\u4e86\u4e00\u4e0b\u3002
\n\u539f\u7406
\n\u56de\u5230\u4e3b\u9898\u4e0a\uff01
\n\u524d\u6bb5\u65f6\u95f4\u4f7f\u7528UDP\u96a7\u9053\u5efa\u7acb\u4e86\u4e00\u4e2aVPN\uff0c\u628a\u6211\u5b66\u6821\u91cc\u7684\u4e00\u4e2aVPS\u8ddf\u7f8e\u56fd\u7684VPS\u63a5\u5165\u4e86\u540c\u4e00\u4e2a\u7f51\u7edc\u3002\u53c2\u8003\u4e86\u8fd9\u7bc7\u6587\u7ae0\u300aSSH_VPN\u300b\uff0c\u6709\u5174\u8da3\u7684\u540c\u5b66\u53ef\u4ee5\u770b\u4e00\u4e0b\u5982\u4f55\u4f7f\u7528\u7cfb\u7edf\u5de5\u5177\u624b\u52a8\u5efa\u7acb\u4e00\u4e2aVPN\u3002
\n\u8fd9\u6b21\u8981\u505a\u7684\u662f\uff0c\u8ba9\u4ece\u7b14\u8bb0\u672c\u8f93\u51fa\u7684IP\u5305\uff0c\u4f7f\u7528ICMP\u534f\u8bae\u5c01\u88c5\u540e\uff0c\u50cfping\u5305\u4e00\u6837\u53d1\u9001\u5230\u6211\u7684\u670d\u52a1\u5668\uff0c\u7136\u540e\u6211\u7684\u670d\u52a1\u5668\u89e3\u9664ICMP\u7684\u5c01\u88c5\uff0c\u628a\u5f97\u5230\u7684 IP\u5305\u5199\u5165\u672c\u5730\u8def\u7531\u3002\u63a5\u7740\uff0c\u628a\u6355\u83b7\u5230\u7684\u53d1\u9001\u7ed9\u7b14\u8bb0\u672c\u7684IP\u5305\uff0c\u4f7f\u7528ICMP\u5c01\u88c5\uff0c\u50cfpong\u5305\uff08ping\u7684reply\uff09\u4e00\u6837\u53d1\u9001\u5230\u6211\u7684\u7b14\u8bb0\u672c\u3002\u5230\u8fbe\u7b14\u8bb0\u672c \u4e4b\u540e\uff0c\u63a5\u89e6ICMP\u5c01\u88c5\uff0c\u628a\u5f97\u5230\u7684IP\u5305\u5199\u5165\u672c\u5730\u8def\u7531\u3002\u8fd9\u6837\u5c31\u5728\u4e24\u4e2a\u673a\u5668\u4e4b\u95f4\u5efa\u7acb\u4e86\u70b9\u5bf9\u70b9\u7f51\u7edc\u4e86\u3002\u5728\u6b64\u57fa\u7840\u4e0a\uff0c\u4f7f\u7528ip\uff0ciptables\u547d\u4ee4\u8bbe\u7f6e\u4e00\u4e0b\u89c4 \u5219\uff0c\u5c31\u5efa\u7acb\u4e86\u4e00\u4e2aVPN\u3002
\n\u6a21\u62df\u4e00\u4e2a\u7f51\u9875\u8bf7\u6c42\u6d41\u7a0b\uff0c
\n1\u3001Firefox\u5728\u7b14\u8bb0\u672c\u53d1\u51fa\u4e00\u4e2a\u8bf7\u6c42\u3002
\n 2\u3001\u5185\u6838\u4f7f\u7528\u9ed8\u8ba4\u8def\u7531\u53d1\u9001\u8fd9\u4e2a\u8bf7\u6c42\u7684IP\u5305\u3002
\n 3\u3001\u56e0\u4e3a\u9ed8\u8ba4\u8def\u7531\u7684\u8bbe\u5907\u8bbe\u7f6e\u7684\u662ftun0\uff0c\u6240\u4ee5\u88abtunnel\u7a0b\u5e8f\u6355\u83b7\u3002
\n 4\u3001tunnel\u7a0b\u5e8f\u8bfb\u53d6ip\u5305\u540e\uff0c\u7528icmp\u5c01\u88c5\uff0c\u53d1\u9001\u5230\u8fdc\u7a0bvps\u3002
\n 5\u3001icmp\u65e0\u969c\u788d\u5730\u901a\u8fc7cmwap\u7f51\u7edc\uff0c\u53d1\u9001\u5230\u8fdc\u7a0bvps\u4e0a\u3002
\n 6\u3001\u8fdc\u7a0bvps\u6536\u5230\u540e\uff0c\u88ab\u670d\u52a1\u5668\u7aef\u7684tunnel\u7a0b\u5e8f\u6355\u83b7\uff08tunnel\u7a0b\u5e8f\u6355\u83b7\u6240\u6709\u7684icmp\u6570\u636e\u5305\uff09\u3002
\n 7\u3001tunnel\u7a0b\u5e8f\u8bfb\u53d6icmp\u5305\uff0c\u83b7\u53d6\u91cc\u9762\u7684ip\u5305\uff0c\u5199\u5165\u5230\u672c\u5730\u7f51\u7edc\u4e2d\u3002
\n 8\u3001\u56e0\u4e3a\u901a\u8fc7iptables\u8bbe\u7f6e\u4e86nat\uff0c\u6240\u4ee5\u8be5ip\u5305\u7684\u6e90\u5730\u5740\u88ab\u6539\u4e3avps ip\u540e\uff0c\u53d1\u9001\u5230\u4e86\u6240\u8bf7\u6c42\u7684\u670d\u52a1\u5668\u4e0a\u3002
\n 9\u3001\u4e00\u4e2aIP\u5305\u4ece\u8bf7\u6c42\u7684\u670d\u52a1\u5668\u4e0a\u8fd4\u56de\u5230vps\uff0c\u7ecf\u8fc7nat\u540e\uff0c\u8fdb\u5165tunnel\u7a0b\u5e8f\u5efa\u7acb\u7684\u7f51\u7edc\uff0c\u88abtunnel\u7a0b\u5e8f\u6355\u83b7\u3002
\n 10\u3001tunnel\u7a0b\u5e8f\u8bfb\u53d6ip\u5305\u540e\uff0c\u7528icmp\u5c01\u88c5\uff0c\u53d1\u9001\u5230\u7b14\u8bb0\u672c\u3002
\n 11\u3001icmp\u56de\u5e94\u5305\u65e0\u969c\u788d\u5730\u901a\u8fc7cmwap\u7f51\u7edc\uff0c\u53d1\u9001\u5230\u7b14\u8bb0\u672c\u4e0a\u3002
\n 12\u3001\u7b14\u8bb0\u672c\u63a5\u6536\u5230\u8be5icmp\u5305\uff0c\u88ab\u7b14\u8bb0\u672c\u4e0a\u7684tunnel\u7a0b\u5e8f\u6355\u83b7\u3002
\n 13\u3001tunnel\u7a0b\u5e8f\u8bfb\u53d6icmp\u5305\uff0c\u83b7\u53d6\u91cc\u9762\u7684ip\u5305\uff0c\u5199\u5165\u5230\u672c\u5730\u7f51\u7edc\u4e2d\u3002
\n 14\u3001\u5185\u6838\u5f97\u5230\u8fd9\u4e2aip\u5305\uff0c\u901a\u77e5\u6307\u5b9a\u7684\u5e94\u7528\u7a0b\u5e8f\u54cd\u5e94\u3002
\n 15\u3001Firefox\u6536\u5230\u4e86\u56de\u5e94\u3002
\n\u5f88\u8be6\u7ec6\u5427\uff01\uff01\uff01\u5b8c\u6574\u7684\u5de5\u4f5c\u6d41\u7a0b\u5c31\u662f\u8fd9\u6837\u3002\u4f46\u5173\u952e\u9700\u8981\u89e3\u51b3\u7684\u662f\u5c01\u88c5ip\u5305\u548c\u89e3\u9664\u5c01\u88c5\u3002
\n\u6b65\u9aa4
\n\u9700\u8981\u89e3\u51b3\u4ee5\u4e0b\u4e00\u4e9b\u95ee\u9898\uff1a
\n1\u3001\u5982\u4f55\u6355\u83b7\u4e0e\u53d1\u9001icmp\u5305
\n\u7528socket\u7684RAW\u6a21\u5f0f\u5373\u53ef\u3002
\n2\u3001\u5982\u4f55\u4e0d\u5f71\u54cdvps\u4e0a\u6b63\u5e38\u7684ping\u56de\u5e94
\n\u7ed9icmp\u91cc\u7684code\u5b57\u6bb5\u8bbe\u7f6e\u4e00\u4e2a\u56fa\u5b9a\u503c\uff0c\u9ed8\u8ba4\u662f0\uff0c\u8fd9\u4e2a\u503c\u53ef\u4ee5\u968f\u4fbf\u8bbe\u7f6e\u3002\u4f8b\u598286\u3002\u8fd9\u6837\u6211\u4eec\u53ea\u6355\u83b7\u4e0e\u53d1\u9001code\u503c\u4e3a86\u7684icmp\u6570\u636e\u5305\u3002\u8ddf\u666e\u901a\u7684ping\u533a\u522b\u5f00\u6765\uff0c\u4e92\u4e0d\u5f71\u54cd\u3002
\n\u540c\u65f6\uff0c\u907f\u514dvps\u7684\u5185\u6838\u56de\u5e94\u6211\u4eec\u7684icmp\u5305\u3002\u6dfb\u52a0\u4e0b\u9762\u7684iptables\u89c4\u5219\u3002\u4f7f\u7528\u5230–icmp-type type\/code\u9009\u9879\u3002type\u7684\u503c\u4e2d\uff0c8\u662fping\u8bf7\u6c42\uff0c0\u662fping\u54cd\u5e94\uff0c\u6240\u4ee5\u53ea\u9488\u5bf9\u54cd\u5e94\u5305\u5c4f\u853d\u3002\u4f46\u662f\u4e3a\u4e86\u8ba9\u670d\u52a1\u5668\u7aef\u7684tunnel\u7a0b\u5e8f\u7684icmp \u80fd\u53d1\u51fa\u53bb\uff0c\u670d\u52a1\u5668\u7aef\u5728\u53d1\u9001\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u628acode+1\uff0c\u4e5f\u5c31\u53d8\u4e3a87\uff0c\u53d1\u9001\u51fa\u53bb\u3002<\/p>\n
iptables -A OUTPUT -p icmp --icmp-type 0\/86 -j DROP\n<\/code><\/pre>\n\u4e86\u89e3\u66f4\u591a\u5173\u4e8eICMP\u7684\u9009\u9879\uff0c\u8bf7\u53c2\u89c1RFC792.
\n3\u3001MTU\u95ee\u9898
\n\u56e0\u4e3aIP\u5305\u88ab\u5c01\u88c5\u5230ICMP\u91cc\u4e4b\u540e\uff0c\u4f53\u79ef\u80af\u5b9a\u4f1a\u53d8\u5927\uff0c\u5982\u679c\u8d85\u51fa\u7f51\u7edc\u7684MTU\uff0c\u5185\u6838\u5c31\u4f1a\u7528\u4e24\u4e2aIP\u5305\u6765\u88c5\u3002\u5bfc\u81f4\u7b2c\u4e00\u4e2aIP\u5305\u88c5\u6ee1\u4e86\uff0c\u7b2c\u4e8c\u4e2aIP\u5305\u53ef\u80fd\u53ea\u6709\u51e0\u5341\u4e2a\u5b57\u8282\u3002\u5341\u5206\u6d6a\u8d39\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u73b0\u8c61\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u865a\u62df\u7f51\u5361\u7684mtu\u4e3a1000\u6216\u66f4\u5c11\u3002<\/p>\n
ip link set t0 mtu 1000\n<\/code><\/pre>\n4\u3001Python\u91cc\u5904\u7406ICMP
\n\u6211\u81ea\u5df1\u5199\u4e86\u4e00\u6bb5\u4ee3\u7801\uff0cchecksum\u7684\u7b97\u6cd5\u53c2\u8003\u81ea http:\/\/code.activestate.com\/recipes\/409689-icmplib-library-for-creating-and-reading-icmp-pack\/<\/a>
\nicmp.py<\/p>\n view plaincopy to clipboardprint?\n\n\n #!\/usr\/bin\/env python \n import socket \n import binascii \n import struct \n import ctypes \n \n BUFFER_SIZE = 8192 \n \n class IPPacket(): \n def _checksum(self, data): \n if len(data) % 2: \n odd_byte = ord(data[-1]) \n data = data[:-1] \n else: \n odd_byte = 0 \n words = struct.unpack("!%sH" %(len(data)\/2), data) \n total = 0 \n for word in words: \n total += word \n else: \n total += odd_byte \n total = (total>>16) + (total & 0xffff) \n total += total>>16 \n return ctypes.c_ushort(~total).value \n \n def parse(self, buf, debug = True): \n self.ttl, self.proto, self.chksum = struct.unpack("!BBH", buf[8:12]) \n self.src, self.dst = buf[12:16], buf[16:20] \n if debug: \n print "parse IP ttl=", self.ttl, "proto=", self.proto, "src=", socket.inet_ntoa(self.src), \n "dst=", socket.inet_ntoa(self.dst) \n \n class ICMPPacket(IPPacket): \n def parse(self, buf, debug = True): \n IPPacket.parse(self, buf, debug) \n self.type, self.code, self.chksum, self.id, self.seqno = struct.unpack("!BBHHH", buf[20:28]) \n if debug: \n print "parse ICMP type=", self.type, "code=", self.code, "id=", self.id, "seqno=", self.seqno \n return buf[28:] \n \n def create(self, type_, code, id_, seqno, data): \n packfmt = "!BBHHH%ss" % (len(data)) \n args = [type_, code, 0, id_, seqno, data] \n args[2] = IPPacket._checksum(self, struct.pack(packfmt, *args)) \n return struct.pack(packfmt, *args) \n<\/code><\/pre>\n4\u3001\u6211\u5199\u7684Tunnel\u7a0b\u5e8f
\n\u5b9e\u73b0\u4e86\u4ee5\u4e0b\u529f\u80fd\uff1a
\n1\uff09\u652f\u6301\u591a\u4eba\u540c\u65f6\u4f7f\u7528\u8fd9\u4e2aVPN\u3002\u6bcf\u4e2a\u5ba2\u6237\u7aef\u901a\u8fc7\u5916\u7f51IP\u4e0eICMP\u91cc\u7684ID\u7684\u7ec4\u5408\u6765\u51b3\u5b9a\u3002\u6240\u4ee5\uff0c\u5373\u4f7f\u591a\u4e2a\u4f7f\u7528\u8005\u5728\u540c\u4e00\u4e2a\u5c40\u57df\u7f51\u4e0b\uff0c\u4e5f\u4e0d\u4f1a\u76f8\u4e92\u4f7f\u7528\u3002\u53c2\u89c1\u4ee3\u7801\u4e2dkey\u7684\u8ba1\u7b97\u3002
\n2\uff09\u4f7f\u7528\u5bc6\u7801\u767b\u5f55\u4ee5\u9650\u5236\u4ed6\u4eba\u8bbf\u95ee\u3002\u521d\u6b21\u8fde\u63a5\u670d\u52a1\u5668\u8981\u6c42\u5bc6\u7801\u624d\u80fd\u4f7f\u7528\u8be5VPN\u3002\u9ed8\u8ba4\u4e3a10\u5206\u949f\u6536\u4e0d\u5230\u6765\u81ea\u5ba2\u6237\u7aef\u7684\u6570\u636e\u5305\u5c31\u5220\u9664\u4f1a\u8bdd\u3002\u8fd9\u4e2a\u5bc6\u7801\u767b\u5f55\u505a\u7684\u6709\u70b9\u7b80\u5355\uff0c\u5f53\u7136\u53ea\u8981\u7a0d\u52a0\u4fee\u6539\uff0c\u8ba9\u670d\u52a1\u5668\u8fd4\u56de\u4e00\u4e2a\u968f\u673a\u5b57\u7b26\u4e32\uff0c\u5ba2\u6237\u7aef\u7528\u5bc6\u7801\u8ddf\u8fd9\u4e2a\u968f\u673a\u5b57\u7b26\u4e32\u4e00\u8d77hash\u4e00\u4e0b\uff0c\u5c31\u5f88\u65e0\u654c\u4e86\u3002
\n3\uff09\u670d\u52a1\u5668\u7aef\u548c\u5ba2\u6237\u7aef\u5171\u7528\u4e00\u4e2atunnel\u7a0b\u5e8f\u3002\u901a\u8fc7\u53c2\u6570\u6765\u6307\u5b9a\u5de5\u4f5c\u6a21\u5f0f\u3002
\ntunnel.py<\/p>\n
view plaincopy to clipboardprint?\n\n\n #!\/usr\/bin\/env python \n \n import os, sys \n import hashlib \n import getopt \n import fcntl \n import icmp \n import time \n import struct \n import socket, select \n \n SHARED_PASSWORD = hashlib.md5("password").digest() \n TUNSETIFF = 0x400454ca \n IFF_TUN = 0x0001 \n \n MODE = 0 \n DEBUG = 0 \n PORT = 0 \n IFACE_IP = "10.0.0.1" \n MTU = 1500 \n CODE = 86 \n TIMEOUT = 60*10 # seconds \n \n class Tunnel(): \n def create(self): \n self.tfd = os.open("\/dev\/net\/tun", os.O_RDWR) \n ifs = fcntl.ioctl(self.tfd, TUNSETIFF, struct.pack("16sH", "t%d", IFF_TUN)) \n self.tname = ifs[:16].strip("x00") \n \n def close(self): \n os.close(self.tfd) \n \n def config(self, ip): \n os.system("ip link set %s up" % (self.tname)) \n os.system("ip link set %s mtu 1000" % (self.tname)) \n os.system("ip addr add %s dev %s" % (ip, self.tname)) \n \n def run(self): \n self.icmpfd = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.getprotobyname("icmp")) \n \n self.clients = {} \n packet = icmp.ICMPPacket() \n self.client_seqno = 1 \n \n while True: \n rset = select.select([self.icmpfd, self.tfd], [], [])[0] \n for r in rset: \n if r == self.tfd: \n if DEBUG: os.write(1, ">") \n data = os.read(self.tfd, MTU) \n if MODE == 1: # Server \n for key in self.clients: \n buf = packet.create(0, CODE+1, self.clients[key]["id"], self.clients[key]["seqno"], data) \n self.clients[key]["seqno"] += 1 \n self.icmpfd.sendto(buf, (self.clients[key]["ip"], 22)) \n # Remove timeout clients \n curTime = time.time() \n for key in self.clients.keys(): \n if curTime - self.clients[key]["aliveTime"] > TIMEOUT: \n print "Remove timeout client", self.clients[key]["ip"] \n del self.clients[key] \n else: # Client \n buf = packet.create(8, CODE, PORT, self.client_seqno, data) \n self.client_seqno += 1 \n self.icmpfd.sendto(buf, (IP, 22)) \n elif r == self.icmpfd: \n if DEBUG: os.write(1, "<") \n buf = self.icmpfd.recv(icmp.BUFFER_SIZE) \n data = packet.parse(buf, DEBUG) \n ip = socket.inet_ntoa(packet.src) \n if packet.code in (CODE, CODE+1): \n if MODE == 1: # Server \n key = struct.pack("4sH", packet.src, packet.id) \n if key not in self.clients: \n # New client comes \n if data == SHARED_PASSWORD: \n self.clients[key] = {"aliveTime": time.time(), \n "ip": ip, \n "id": packet.id, \n "seqno": packet.seqno} \n print "New Client from %s:%d" % (ip, packet.id) \n else: \n print "Wrong password from %s:%d" % (ip, packet.id) \n buf = packet.create(0, CODE+1, packet.id, packet.seqno, "PASSWORD"*10) \n self.icmpfd.sendto(buf, (ip, 22)) \n else: \n # Simply write the packet to local or forward them to other clients ??? \n os.write(self.tfd, data) \n self.clients[key]["aliveTime"] = time.time() \n else: # Client \n if data.startswith("PASSWORD"): \n # Do login \n buf = packet.create(8, CODE, packet.id, self.client_seqno, SHARED_PASSWORD) \n self.client_seqno += 1 \n self.icmpfd.sendto(buf, (ip, 22)) \n else: \n os.write(self.tfd, data) \n \n def usage(status = 0): \n print "Usage: icmptun [-s code|-c serverip,code,id] [-hd] [-l localip]" \n sys.exit(status) \n \n if __name__=="__main__": \n opts = getopt.getopt(sys.argv[1:],"s:c:l:hd") \n for opt,optarg in opts[0]: \n if opt == "-h": \n usage() \n elif opt == "-d": \n DEBUG += 1 \n elif opt == "-s": \n MODE = 1 \n CODE = int(optarg) \n elif opt == "-c": \n MODE = 2 \n IP,CODE,PORT = optarg.split(",") \n CODE = int(CODE) \n PORT = int(PORT) \n elif opt == "-l": \n IFACE_IP = optarg \n \n if MODE == 0 or CODE == 0: \n usage(1) \n \n tun = Tunnel() \n tun.create() \n print "Allocated interface %s" % (tun.tname) \n tun.config(IFACE_IP) \n try: \n tun.run() \n except KeyboardInterrupt: \n tun.close() \n sys.exit(0) \n<\/code><\/pre>\n\u7528\u6cd5\uff1a<\/p>\n
root@244754:~\/lab\/icmptun# .\/tunnel.py\n Usage: icmptun [-s code|-c serverip,code,id] [-hd] [-l localip]\n\n\n5\u3001VPS\u670d\u52a1\u5668\u7aef\u90e8\u7f72\n<\/code><\/pre>\n\u628aicmp.py\u548ctunnel.py\u90fdcopy\u5230vps\u4e0a\u53bb\u3002\u6ce8\u610f\u8981\u8bbe\u7f6e\u4e3a\u53ef\u6267\u884c\u6587\u4ef6\u3002\u7136\u540e\u7528\u4e0b\u9762\u7684\u547d\u4ee4\u6765\u8fd0\u884c\u3002<\/p>\n
.\/tunnel.py -s 86 -l 10.1.2.1\/24\n Allocated interface t1\n<\/code><\/pre>\ntunnel.py\u4f1a\u521b\u5efa\u4e00\u4e2a\u865a\u62df\u7f51\u5361\uff08tun\uff09\u3002\u4e0a\u8ff0\u547d\u4ee4\u4e2d\uff0c\u865a\u62df\u7f51\u5361\u7684IP\u4e3a10.1.2.1\uff0c\u5b50\u7f51\u63a9\u7801\u4e3a255.255.255.0\u3002
\n\u67e5\u770b\u5df2\u7ecf\u5efa\u7acb\u7684\u7f51\u5361\uff0c\u6211\u8fd9\u91cc\u663e\u793a\u4e3at1. \u56e0\u4e3at0\u5df2\u7ecf\u88ab\u6211\u7528\u4f5cudp\u96a7\u9053\u3002
\nroot@244754:~\/lab\/icmptun# ip route show
\n184.22.224.0\/24 dev venet0 proto kernel scope link src 184.22.224.212
\n10.1.1.0\/24 dev t0 proto kernel scope link src 10.1.1.1
\n10.1.2.0\/24 dev t1 proto kernel scope link src 10.1.2.1
\ndefault dev venet0 scope link
\n6\u3001\u7b14\u8bb0\u672c\u4e0a\u5ba2\u6237\u7aef\u90e8\u7f72
\n\u4ee5\u5ba2\u6237\u7aef\u6a21\u5f0f\u542f\u52a8tunnel.py\uff0c<\/p>\n
root@xiaoxia-pc:~\/project\/icmptun# .\/tunnel.py -c 184.22.224.212,86,2012 -l 10.1.2.2\/24\n Allocated interface t0\n<\/code><\/pre>\n-c\u7684\u53c2\u6570\u6307\u5b9a\u4e09\u9879\u5185\u5bb9\uff0c\u7528\u9053\u53f7\u5206\u9694\uff0c\u5206\u522b\u662f\u8fdc\u7a0b\u670d\u52a1\u5668\u7aef\u7684IP\uff0c\u53d1\u9001ping\u65f6\u6240\u4f7f\u7528\u7684code\uff0c\u53d1\u9001ping\u65f6\u6240\u4f7f\u7528\u7684id\u3002code\u662f\u533a\u522b\u666e\u901a\u7684ping\u5305\uff0cid\u662f\u533a\u522b\u4e0d\u540c\u7684\u5ba2\u6237\u7aef\u3002
\n\u6ce8\u610f\uff0c\u5982\u679c\u5728\u5c40\u57df\u7f51\u73af\u5883\u4e0b\uff0c\u7ecf\u8fc7\u7f51\u5173\u540e\uff0c\u8fd9\u4e2aid\u53ef\u80fd\u4f1a\u53d8\u5316\uff0c\u4f46\u4e0d\u5f71\u54cd\u4f7f\u7528\uff0c\u56e0\u4e3a\u56de\u5e94\u5305\u8fdb\u5165\u5185\u7f51\u65f6\uff0cid\u4f1a\u53d8\u56de\u539f\u503c\u3002
\n\u542f\u52a8\u5ba2\u6237\u7aef\u540e\uff0c\u5728\u672c\u5730\u53ef\u4ee5ping\u4e00\u4e0bIP\u3002
\nroot@xiaoxia-pc:~\/project\/icmptun# ping 10.1.2.2
\nPING 10.1.2.2 (10.1.2.2) 56(84) bytes of data.
\n64 bytes from 10.1.2.2: icmp_req=1 ttl=64 time=0.065 ms
\n64 bytes from 10.1.2.2: icmp_req=2 ttl=64 time=0.065 ms
\n64 bytes from 10.1.2.2: icmp_req=3 ttl=64 time=0.059 ms
\n\u5f88\u5feb\u5c31\u54cd\u5e94\u4e86\uff0c\u672c\u5730\u76f4\u63a5\u8fd4\u56de\u3002
\n\u6b64\u65f6ping\u4e00\u4e0b\u5728vps\u7684\u865a\u62df\u7f51\u5361\uff0c\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0c\u5e94\u8be5\u80fd\u5f97\u5230\u56de\u5e94\u4e86\u3002
\nroot@xiaoxia-pc:~\/project\/icmptun# ping 10.1.2.1
\nPING 10.1.2.1 (10.1.2.1) 56(84) bytes of data.
\n64 bytes from 10.1.2.1: icmp_req=1 ttl=64 time=322 ms
\n64 bytes from 10.1.2.1: icmp_req=2 ttl=64 time=545 ms
\n64 bytes from 10.1.2.1: icmp_req=3 ttl=64 time=400 ms
\n\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u5df2\u7ecf\u5728\u4e24\u53f0\u673a\u5668\u4e4b\u95f4\u901a\u8fc7icmp\u5efa\u7acb\u4e86\u70b9\u5bf9\u70b9\u96a7\u9053\u3002
\n7\u3001\u6784\u5efaVPN
\n\u5148\u5728\u670d\u52a1\u5668\u7aef\u8bbe\u7f6eNAT\u3002<\/p>\n
iptables -t nat -A POSTROUTING -s 10.1.2.0\/24 -j SNAT --to-source 184.22.224.212\n<\/code><\/pre>\n\u518d\u5728\u672c\u5730\u8bbe\u7f6e\u8def\u7531\u8868\uff0c\u8ba9\u9ed8\u8ba4\u7f51\u5173\u4e3a\u65b0\u521b\u5efa\u7684t0. \u540c\u65f6\u6ce8\u610f\u628avps\u7684ip\u8bbe\u7f6e\u4e3a\u4f8b\u5916\u3002<\/p>\n
ip route add 184.22.224.212 via 10.64.64.64 dev ppp0\n ip route del default\n ip route add default dev t0\n<\/code><\/pre>\n\u6211\u7684\u8def\u7531\u8868\u5982\u4e0b\uff1a
\nroot@xiaoxia-pc:~\/project\/icmptun# ip route show
\n10.64.64.64 dev ppp0 proto kernel scope link src 10.134.75.35
\n184.22.224.212 via 10.64.64.64 dev ppp0
\n10.1.2.0\/24 dev t0 proto kernel scope link src 10.1.2.2
\n169.254.0.0\/16 dev ppp0 scope link metric 1000
\ndefault dev t0 scope link
\n\u5230\u6b64\uff0c\u5df2\u7ecf\u53ef\u4ee5\u901a\u8fc7t0\u8bbf\u95ee\u7f51\u7edc\u4e86\u3002<\/p>\n
root@xiaoxia-pc:~\/project\/icmptun# telnet www.google.com 80\n Trying 203.208.46.180...\n Connected to www.google.com.\n Escape character is '^]'.\n<\/code><\/pre>\n\u6700\u540e
\n\u53ef\u4ee5\u628a\u542f\u52a8\u5ba2\u6237\u7aef\u4ee5\u53ca\u8bbe\u7f6e\u8def\u7531\u7684\u547d\u4ee4\uff0c\u5199\u8fdb\u4e00\u4e2a\u811a\u672c\u6587\u4ef6\u91cc\uff0c\u8fd9\u6837\u53ea\u9700\u8981\u4e00\u4e2a\u547d\u4ee4\uff0c\u5c31\u80fd\u4f7f\u7528VPN\u4e86\uff01\u50cf\u5728\u6211\u8fd9\u4e2a\u5730\u65b9\uff0c\u5c31\u53ef\u4ee5\u7528\u8fd9\u4e2a\u5de5\u5177\u5b9e\u73b0\u5728CMWAP\u7684\u7f51\u7edc\u4e0a\u514d\u8d39\u4e0a\u7f51\uff0c\u6ca1\u6709\u6d41\u91cf\u7684\u9650\u5236\u3002
\n\u5f53\u7136\uff0cICMP Tunnel\u5728\u5f88\u591a\u573a\u5408\u4e0b\u90fd\u53ef\u4ee5\u4f7f\u7528\uff0c\u53ea\u8981ICMP\u6ca1\u6709\u88ab\u5c01\uff0c\u5c31\u6709\u529e\u6cd5\u901a\u8fc7ICMP\u6765\u5efa\u7acb\u96a7\u9053\u548cVPN\u6765\u6446\u8131\u7f51\u7edc\u9650\u5236\u3002
\n\u6211\u4f7f\u7528\u4e2d\u7684\u6293\u5305\uff0c<\/p>\n
Wireshark\u5f88\u597d\u7528\uff0c\u5728\u6211\u5206\u6790ICMP\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5e2e\u52a9\u5f88\u5927\u3002\u5f53\u7136\u5728\u670d\u52a1\u5668\u4e0a\u4f7f\u7528tcpdump -n icmp\u6765\u67e5\u770bICMP\u662f\u5426\u5de5\u4f5c\u4e5f\u5f88\u6709\u7528\u3002
\n184.22.224.213\u662f\u6211\u7684VPS\u4e0aIP\u4e4b\u4e00\u3002<\/p>\n
\u73b0\u5728\u5df2\u7ecf\u591c\u6df1\u4e86\uff0cEDGE\u7684\u901f\u5ea6\u8fd8\u884c\u5427\u3002
\nroot@xiaoxia-pc:~\/project\/icmptun# wget http:\/\/xiaoxia.org\/upfiles\/a.zip<\/a>
\n–2012-01-16 04:22:54– http:\/\/xiaoxia.org\/upfiles\/a.zip<\/a>
\n\u6b63\u5728\u89e3\u6790\u4e3b\u673a xiaoxia.org… 184.22.224.213
\n\u6b63\u5728\u8fde\u63a5 xiaoxia.org|184.22.224.213|:80… \u5df2\u8fde\u63a5\u3002
\n\u5df2\u53d1\u51fa HTTP \u8bf7\u6c42\uff0c\u6b63\u5728\u7b49\u5f85\u56de\u5e94… 200 OK
\n\u957f\u5ea6\uff1a 262194 (256K) [application\/zip]
\n\u6b63\u5728\u4fdd\u5b58\u81f3: “a.zip.1”<\/p>\n100%[============================================>] 262,194 18.8K\/s \u82b1\u65f6 14s<\/p>\n
2012-01-16 04:23:09 (18.5 KB\/s) – \u5df2\u4fdd\u5b58 “a.zip.1” [262194\/262194])<\/p>\n
\u672c\u6587\u4e3b\u8981\u7528\u4e8e\u5b66\u4e60\u4ea4\u6d41\uff0c\u6b22\u8fce\u4e0e\u5927\u5bb6\u5171\u540c\u63a2\u8ba8\uff01\uff01\uff01
\n\u9644\u672c\u6587\u6240\u7528\u4ee3\u7801\u6587\u4ef6\u4e0b\u8f7d\uff1a
\nicmptun.tar<\/p>\n
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