{"id":5202,"date":"2021-05-05T00:31:33","date_gmt":"2021-05-04T16:31:33","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=5202"},"modified":"2021-05-05T00:31:33","modified_gmt":"2021-05-04T16:31:33","slug":"p2p%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0%e5%86%85%e7%bd%91%e7%a9%bf%e9%80%8f%ef%bc%88%e6%89%93%e6%b4%9e%ef%bc%89","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/5202","title":{"rendered":"P2P\u5982\u4f55\u5b9e\u73b0\u5185\u7f51\u7a7f\u900f\uff08\u6253\u6d1e\uff09"},"content":{"rendered":"

\u539f\u6587\u5730\u5740<\/a><\/p>\n

 <\/p>\n

\u7248\u6743
\n\u76ee\u5f55<\/p>\n

\u6982\u8ff0<\/p>\n

P2P\u7b80\u4ecb<\/p>\n

P2P\u901a\u4fe1\u6280\u672f<\/p>\n

\u4e2d\u7ee7\uff08Relaying\uff09<\/p>\n

\u9006\u5411\u8fde\u63a5\uff08Connection reversal\uff09<\/p>\n

UDP\u6253\u6d1e<\/p>\n

\u7aef\u70b9\u5904\u4e8e\u4e0d\u540cNAT<\/p>\n

\u7aef\u70b9\u5904\u4e8e\u76f8\u540c\u7684NAT<\/p>\n

\u56fa\u5b9a\u7aef\u53e3\u7ed1\u5b9a<\/p>\n

\u7a7a\u95f2\u72b6\u6001\u4e0b\u7684\u8d85\u65f6\u95ee\u9898<\/p>\n

TCP\u6253\u6d1e<\/p>\n

\u5957\u63a5\u5b57\u548cTCP\u7aef\u53e3\u7684\u91cd\u7528<\/p>\n

\u6253\u5f00P2P\u7684TCP\u6d41<\/p>\n

TCP\u540c\u65f6\u6253\u5f00<\/p>\n

\u53c2\u8003\u8d44\u6599<\/p>\n

\u6982\u8ff0
\nP2P\u7b80\u4ecb
\n\u6211\u4eec\u77e5\u9053\uff0c\u5185\u7f51\u8bbe\u5907\u662f\u4e0d\u80fd\u76f4\u63a5\u8bbf\u95ee\u516c\u7f51\u7684\uff0c\u5982\u679c\u9700\u8981\u5185\u7f51\u8bbe\u5907\u53ef\u4ee5\u8bbf\u95ee\u516c\u7f51\uff0c\u9700\u8981\u501f\u52a9NAT\uff08Net Address Transmit\uff09\u3002\u5982\u679c\u544a\u8bc9\u4f60\uff0c\u53ef\u4ee5\u4e0d\u901a\u8fc7\u516c\u7f51\uff0c\u53ef\u4ee5\u5b9e\u73b0\u4e24\u4e2a\u4e0d\u540c\u7f51\u7edc\u7684\u5185\u7f51\u8bbe\u5907\u95f4\u7684\u76f4\u63a5\u901a\u4fe1\uff0c\u4f60\u4fe1\u4e0d\u4fe1\uff1f\u901a\u8fc7\u6700\u57fa\u672c\u7684\u8ba4\u77e5\u5206\u6790\uff0c\u4e0a\u8ff0\u8bf4\u6cd5\u597d\u50cf\u6709\u95ee\u9898\uff1a\u4e0d\u901a\u8fc7\u516c\u7f51\uff0c\u600e\u4e48\u53ef\u80fd\u5b9e\u73b0\u4e24\u4e2a\u5185\u7f51\u8bbe\u5907\u7684\u4ea4\u4e92\u5462\uff1f\u5982\u679c\u6709\u8fd9\u79cd\u65b9\u6cd5\uff0c\u90a3\u4e48\u80af\u5b9a\u4f1a\u5728\u67d0\u4e2a\u65b9\u9762\u7528\u5230\u516c\u7f51\u3002<\/p>\n

P2P\u5c31\u662f\u8fd9\u6837\u7684\u6280\u672f\uff0c\u53ef\u4ee5\u4f7f\u5f97\u4e0d\u540c\u5c40\u57df\u7f51\u7684\u5185\u7f51\u8bbe\u5907\u53ef\u4ee5\u76f4\u8fde\u3002P2P\uff08peer to peer\uff09\u70b9\u5bf9\u70b9\u6280\u672f\u53c8\u79f0\u5bf9\u7b49\u4e92\u8054\u7f51\u7edc\u6280\u672f\uff0c\u662f\u4e00\u79cd\u7f51\u7edc\u65b0\u6280\u672f\uff0c\u4f9d\u8d56\u7f51\u7edc\u4e2d\u53c2\u4e0e\u8005\u7684\u8ba1\u7b97\u80fd\u529b\u548c\u5e26\u5bbd\uff0c\u800c\u4e0d\u662f\u628a\u4f9d\u8d56\u90fd\u805a\u96c6\u5728\u8f83\u5c11\u7684\u51e0\u53f0\u670d\u52a1\u5668\u4e0a\u3002P2P\u7f51\u7edc\u901a\u5e38\u7528\u4e8e\u901a\u8fc7Ad Hoc\u8fde\u63a5\u6765\u8fde\u63a5\u8282\u70b9\u3002\u8fd9\u7c7b\u7f51\u7edc\u53ef\u4ee5\u7528\u4e8e\u591a\u79cd\u7528\u9014\uff0c\u5404\u79cd\u6863\u6848\u5206\u4eab\u8f6f\u4ef6\u5df2\u7ecf\u5f97\u5230\u4e86\u5e7f\u6cdb\u7684\u4f7f\u7528\uff08\u8b6c\u5982\u8fc5\u96f7\u3001\u7535\u9a74\uff09\u3002P2P\u6280\u672f\u4e5f\u88ab\u4f7f\u7528\u5728\u7c7b\u4f3cVoIP\u7b49\u5b9e\u65f6\u5a92\u4f53\u4e1a\u52a1\u7684\u6570\u636e\u901a\u4fe1\u4e2d\u3002<\/p>\n

P2P\u6709\u4e2a\u5f88\u91cd\u8981\u7684\u80fd\u529b\uff0c\u5185\u7f51\u7a7f\u900f\u80fd\u529b\uff0c\u5177\u6709\u8fd9\u4e2a\u80fd\u529b\u540e\uff0c\u4e0d\u540c\u79c1\u7f51\u7684\u8bbe\u5907\u53ef\u4ee5\u76f4\u63a5\u8fdb\u884c\u901a\u4fe1\u3002<\/p>\n

P2P\u901a\u4fe1\u6280\u672f
\n\u6839\u636e\u5ba2\u6237\u7aef\u7684\u4e0d\u540c\uff0c\u5ba2\u6237\u7aef\u4e4b\u95f4\u8fdb\u884cP2P\u4f20\u8f93\u7684\u65b9\u6cd5\u4e5f\u7565\u6709\u4e0d\u540c\uff0cP2P\u4e3b\u8981\u6709\u4e2d\u7ee7\u3001\u9006\u5411\u8fde\u63a5\u3001\u6253\u6d1e\uff08hole punching\uff09\u7b49\u6280\u672f\u3002<\/p>\n

P2P\u6253\u6d1e\u6280\u672f\u4f9d\u8d56\u4e8e\u901a\u5e38\u9632\u706b\u5899\u548c\u9525\u5f62NAT\uff08cone NAT\uff09\u5141\u8bb8\u6b63\u5f53\u7684P2P\u5e94\u7528\u7a0b\u5e8f\u5728\u4e2d\u95f4\u4ef6\u4e2d\u6253\u6d1e\u4e14\u4e0e\u5bf9\u65b9\u5efa\u7acb\u76f4\u63a5\u8fde\u63a5\u7684\u7279\u6027\u3002<\/p>\n

\u6839\u636e\u4f20\u8f93\u65b9\u5f0f\u7684\u4e0d\u540c\uff0cP2P\u6253\u6d1e\u6280\u672f\u5206\u4e3aTCP\u6253\u6d1e\u53caUDP\u6253\u6d1e\u6280\u672f\u3002<\/p>\n

\u5173\u4e8eNAT\u7684\u76f8\u5173\u77e5\u8bc6\u89c1\u6587\u7ae0\u300aNAT\uff0c\u79c1\u7f51\u8bbf\u95ee\u516c\u7f51\u7684\u5229\u5668\u300b<\/p>\n

 <\/p>\n

\u4e2d\u7ee7\uff08Relaying\uff09
\n\u4e2d\u7ee7\u6700\u53ef\u9760\u4f46\u4e5f\u662f\u6700\u4f4e\u6548\u7684\u4e00\u79cdP2P\u901a\u4fe1\u5b9e\u73b0\uff0c\u5176\u539f\u7406\u662f\u901a\u8fc7\u4e00\u4e2a\u6709\u516c\u7f51IP\u7684\u670d\u52a1\u5668\u4e2d\u95f4\u4eba\u5bf9\u4e24\u4e2a\u5185\u7f51\u5ba2\u6237\u7aef\u7684\u901a\u4fe1\u6570\u636e\u8fdb\u884c\u4e2d\u7ee7\u548c\u8f6c\u53d1\uff0c\u5982\u56fe 1\u6240\u793a\uff1a<\/p>\n

\u56fe 1 \u4e2d\u7ee7
\n\u5f53\u670d\u52a1\u7aef\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u6bd4\u8f83\u5c11\uff0c\u4e14\u7f51\u7edc\u6d41\u91cf\u4e0d\u5927\u65f6\uff0c\u6548\u679c\u8fd8\u4e0d\u9519\u3002\u4f46\u662f\u5982\u679c\u6709\u5f88\u591a\u5ba2\u6237\u7aef\u8fde\u63a5\u5e76\u4e14\u7f51\u7edc\u6d41\u91cf\u5f88\u591a\uff0c\u670d\u52a1\u7aef\u7684\u538b\u529b\u5c31\u4f1a\u5f88\u5927\u3002<\/p>\n

 <\/p>\n

\u9006\u5411\u8fde\u63a5\uff08Connection reversal\uff09
\n\u6b64\u79cd\u65b9\u6cd5\u5728\u4e24\u4e2a\u7aef\u70b9\u4e2d\u6709\u4e00\u4e2a\u4e0d\u5b58\u5728\u4e2d\u95f4\u4ef6\uff08\u5982NAT\uff09\u7684\u65f6\u5019\u6709\u6548\u3002\u4f8b\u5982\uff0cClient A\u5728NAT\u4e4b\u540e\u800cClient B\u62e5\u6709\u5168\u5c40IP\u5730\u5740\uff0c\u5982\u56fe 2\u6240\u793a\uff1a<\/p>\n

\u56fe 2 \u9006\u5411\u8fde\u63a5
\nClient A\u5185\u7f51\u5730\u5740\u4e3a10.0.0.1\uff0c\u4f7f\u7528TCP\uff0c\u7aef\u53e3\u4e3a1234\u3002A\u548cServer S\u5efa\u7acb\u4e86\u4e00\u4e2a\u8fde\u63a5\uff0cServer\u7684IP\u5730\u5740\u4e3a18.181.0.31\uff0c\u76d1\u542c1235\u7aef\u53e3\u3002NAT A\u7ed9Client A\u5206\u914d\u4e86TCP\u7aef\u53e362000\uff0c\u5730\u5740\u4e3aNAT\u7684\u516c\u7f51IP\u5730\u5740155.99.25.11\uff0c\u4f5c\u4e3aClient A\u5bf9\u5916\u5f53\u524d\u4f1a\u8bdd\u7684\u4e34\u65f6IP\u548c\u7aef\u53e3\u3002\u56e0\u6b64Server S\u8ba4\u4e3aClient A\u5c31\u662f155.99.25.11:62000\u3002\u800cClient B\u7531\u4e8e\u6709\u516c\u7f51\u5730\u5740\uff0c\u6240\u4ee5\u5bf9Server S\u6765\u8bf4Client B\u5c31\u662f138.76.29.7:1234\u3002<\/p>\n

\u5f53Client B\u60f3\u8981\u4e3b\u52a8\u53d1\u8d77\u5bf9Client A\u7684P2P\u8fde\u63a5\u65f6\uff0c\u9700\u8981\u6307\u5b9a\u76ee\u7684\u5730\u5740\u53ca\u7aef\u53e3\u4e3a155.99.25.11:62000\u3002\u7531\u4e8eNAT\u5de5\u4f5c\u7684\u539f\u7406\u95ee\u9898\uff0cNAT A\u4f1a\u62d2\u7edd\u5c06\u6536\u5230\u7684\u5bf9Client A\u7684\u8bf7\u6c42\u8f6c\u53d1\u7ed9Client A\u3002\u62d2\u7edd\u8be5\u8bf7\u6c42\u4e3b\u8981\u6709\u5982\u4e0b\u539f\u56e0\uff1a<\/p>\n

1. NAT A\u6ca1\u6709\u6620\u5c04\u8fc762000\u7aef\u53e3\uff0cNAT A\u4e0d\u77e5\u9053\u8be5\u8bf7\u6c42\u662f\u7ed9\u8c01\u7684<\/p>\n

2. NAT A\u6620\u5c04\u8fc762000\u7aef\u53e3\uff0c\u4f46\u662f\u9700\u8981\u9996\u5148\u4eceClient A\u53d1\u8d77\u8bf7\u6c42\uff0c\u7136\u540e\u624d\u80fd\u8f6c\u53d1\u5e94\u7b54<\/p>\n

\u5728\u76f4\u63a5\u8fde\u63a5Client A\u5931\u8d25\u4e4b\u540e\uff0cClient B\u53ef\u4ee5\u901a\u8fc7Server S\u5411Client A\u4e2d\u7ee7\u4e00\u4e2a\u8fde\u63a5\u8bf7\u6c42\uff0c\u4ece\u800c\u4eceClient A\u65b9\u5411\u201c\u9006\u5411\u201c\u5730\u5efa\u7acb\u8d77Client A- Client B\u4e4b\u95f4\u7684\u70b9\u5bf9\u70b9\u8fde\u63a5\uff08\u56e0\u4e3aClient A\u8fde\u63a5\u5230\u4e86Server S\uff09\u3002<\/p>\n

\u5f88\u591a\u5f53\u524d\u7684P2P\u7cfb\u7edf\u90fd\u5b9e\u73b0\u4e86\u8fd9\u79cd\u6280\u672f\uff0c\u4f46\u5176\u5c40\u9650\u6027\u4e5f\u662f\u5f88\u660e\u663e\u7684\uff0c\u53ea\u6709\u5f53\u5176\u4e2d\u4e00\u65b9\u6709\u516c\u7f51IP\u65f6\u8fde\u63a5\u624d\u80fd\u5efa\u7acb\u3002\u8d8a\u6765\u8d8a\u591a\u7684\u60c5\u51b5\u4e0b\uff0c\u901a\u4fe1\u7684\u53cc\u65b9\u90fd\u5728NAT\u4e4b\u540e\uff0c\u56e0\u6b64\u5c31\u8981\u7528\u5230\u6253\u6d1e\u6280\u672f\u4e86\u3002<\/p>\n

 <\/p>\n

UDP\u6253\u6d1e
\n\u5bf9\u4e8eUDP\u6253\u6d1e\uff0c\u8003\u8651\u5982\u4e0b\u7684\u4e24\u5f20\u573a\u666f:<\/p>\n

1. \u4e24\u4e2aClient \u5904\u5728\u4e24\u4e2a\u4e0d\u540c\u7684NAT<\/p>\n

2. \u4e24\u4e2aClient \u5728\u540c\u4e00\u4e2aNAT<\/p>\n

\u7aef\u70b9\u5904\u4e8e\u4e0d\u540cNAT
\nClient A\u548cClient B\u7684\u5730\u5740\u90fd\u662f\u5185\u7f51\u5730\u5740\uff0c\u4e14\u5728\u4e0d\u540c\u7684NAT\u540e\u9762\u3002Client A\u3001Client B\u4e0a\u8fd0\u884c\u7684P2P\u5e94\u7528\u7a0b\u5e8f\u548cServer S\u90fd\u4f7f\u7528\u4e86UDP\u7aef\u53e31234\uff0cClient A\u548cClient B\u5206\u522b\u521d\u59cb\u5316\u4e86\u4e0eServer S\u7684UDP\u901a\u4fe1\uff0c\u5730\u5740\u6620\u5c04\u5982\u56fe 3\u6240\u793a:<\/p>\n

\u56fe 3\u7aef\u70b9\u5728\u4e0d\u540c\u7684NAT\u4e4b\u4e0b
\n\u5047\u8bbeClient A\u6253\u7b97\u4e0eClient B\u76f4\u63a5\u5efa\u7acb\u4e00\u4e2aUDP\u901a\u4fe1\u4f1a\u8bdd\u3002\u5982\u679cClient A\u76f4\u63a5\u7ed9Client B\u7684\u516c\u7f51\u5730\u5740138.76.29.7:31000\u53d1\u9001UDP\u6570\u636e\uff0cNAT B\u5f88\u53ef\u80fd\u4f1a\u65e0\u89c6\u8fdb\u5165\u7684\u6570\u636e\uff08\u9664\u975e\u662fFull Cone NAT\uff09\uff0cClient B\u5f80Client A\u76f4\u63a5\u53d1\u4fe1\u606f\u4e5f\u7c7b\u4f3c\u3002<\/p>\n

\u4e3a\u4e86\u89e3\u51b3\u4e0a\u8ff0\u95ee\u9898\uff0c\u5728Client A\u5f00\u59cb\u7ed9Client B\u7684\u516c\u7f51\u5730\u5740\u53d1\u9001UDP\u6570\u636e\u7684\u540c\u65f6\uff0cClient A\u7ed9Server S\u53d1\u9001\u4e00\u4e2a\u4e2d\u7ee7\u8bf7\u6c42\uff0c\u8981\u6c42Client B\u5f00\u59cb\u7ed9Client A\u7684\u516c\u7f51\u5730\u5740\u53d1\u9001UDP\u4fe1\u606f\u3002Client A\u5f80Client B\u7684\u8f93\u51fa\u4fe1\u606f\u4f1a\u5bfc\u81f4NAT A\u6253\u5f00\u4e00\u4e2aClient A\u7684\u5185\u7f51\u5730\u5740\u4e0eClient B\u7684\u5916\u7f51\u5730\u5740\u4e4b\u95f4\u7684\u901a\u8baf\u4f1a\u8bdd\uff0cClient B\u5f80Client A\u4ea6\u7136\u3002\u5f53\u4e24\u4e2a\u65b9\u5411\u90fd\u6253\u5f00\u4f1a\u8bdd\u4e4b\u540e\uff0cClient A\u548cClient B\u5c31\u80fd\u76f4\u63a5\u901a\u8baf\uff0c\u800c\u65e0\u987b\u518d\u901a\u8fc7Server S\u4e86\u3002<\/p>\n

UDP\u6253\u6d1e\u6280\u672f\u6709\u8bb8\u591a\u6709\u7528\u7684\u6027\u8d28\u3002\u4e00\u65e6\u4e00\u4e2a\u7684P2P\u8fde\u63a5\u5efa\u7acb\uff0c\u8fde\u63a5\u7684\u53cc\u65b9\u90fd\u80fd\u53cd\u8fc7\u6765\u4f5c\u4e3a\u201c\u5f15\u5bfc\u670d\u52a1\u5668\u201d\u6765\u5e2e\u52a9\u5176\u4ed6\u4e2d\u95f4\u4ef6\u540e\u7684\u5ba2\u6237\u7aef\u8fdb\u884c\u6253\u6d1e\uff0c\u6781\u5927\u51cf\u5c11\u4e86\u670d\u52a1\u5668\u7684\u8d1f\u8f7d\u3002\u5e94\u7528\u7a0b\u5e8f\u4e0d\u9700\u8981\u77e5\u9053\u4e2d\u95f4\u4ef6\u662f\u4ec0\u4e48\uff08\u5982\u679c\u6709\u7684\u8bdd\uff09\uff0c\u56e0\u4e3a\u4ee5\u4e0a\u7684\u8fc7\u7a0b\u5728\u6ca1\u6709\u4e2d\u95f4\u4ef6\u6216\u8005\u6709\u591a\u4e2a\u4e2d\u95f4\u4ef6\u7684\u60c5\u51b5\u4e0b\u4e5f\u4e00\u6837\u80fd\u5efa\u7acb\u901a\u4fe1\u94fe\u8def\u3002<\/p>\n

\u7aef\u70b9\u5904\u4e8e\u76f8\u540c\u7684NAT
\n\u5982\u679cClient A\u548cClient B\u6b63\u597d\u5728\u540c\u4e00\u4e2aNAT\uff08\u800c\u4e14\u53ef\u80fd\u4ed6\u4eec\u81ea\u5df1\u5e76\u4e0d\u77e5\u9053\uff09\uff0cClient A\u548cServer S\u5efa\u7acb\u4e86\u4e00\u4e2aUDP\u4f1a\u8bdd\uff0cNAT\u4e3a\u6b64\u5206\u914d\u4e86\u516c\u7f51\u7aef\u53e362000\uff0cClient B\u540c\u6837\u548cServer S\u5efa\u7acb\u4f1a\u8bdd\uff0c\u5206\u914d\u5230\u4e86\u7aef\u53e362001\uff0c\u5982\u56fe 4\u6240\u793a\uff1a<\/p>\n

\u56fe 4\u7aef\u70b9\u5728\u76f8\u540c\u7684NAT\u4e4b\u4e0b
\n\u5047\u8bbeClient A\u548cClient B\u4f7f\u7528\u4e86\u4e0a\u8282\u4ecb\u7ecd\u7684UDP\u6253\u6d1e\u6280\u672f\u6765\u5efa\u7acbP2P\u901a\u8def\uff0c\u90a3\u4e48\u4ea4\u4e92\u6d41\u7a0b\u5c31\u662f\u8fd9\u6837\u4e86:<\/p>\n

1. Client A\u548cClient B\u5f97\u5230\u7531Server S\u89c2\u6d4b\u5230\u7684\u5bf9\u65b9\u7684\u516c\u7f51IP\u548c\u7aef\u53e3\u53f7\uff0c\u7136\u540e\u7ed9\u5bf9\u65b9\u7684\u5730\u5740\u53d1\u9001\u4fe1\u606f<\/p>\n

2. \u5f53Client A\u53d1\u9001\u4e00\u4e2aUDP\u6570\u636e\u5305\u7ed9Client B\u7684\u516c\u7f51\u5730\u5740\uff0c\u6570\u636e\u5305\u6700\u521d\u6709\u6e90IP\u5730\u5740\u548c\u7aef\u53e3\u5730\u574010.0.0.1:1234\u548c\u76ee\u7684\u5730\u5740155.99.25.11:62001<\/p>\n

3. NAT\u6536\u5230\u5305\u540e\uff0c\u5c06\u5176\u8f6c\u6362\u4e3a\u6e90155.99.25.11:62000\uff08Client A\u7684\u516c\u7f51\u5730\u5740\uff09\u548c\u76ee\u768410.1.1.3:1234\uff0cNAT\u53d1\u73b0\u76ee\u7684\u516c\u7f51\u5730\u5740\u548c\u5176\u672c\u8eab\u7684\u516c\u7f51\u5730\u5740\u76f8\u540c\uff0c\u6b64\u65f6\u6709\u4e24\u79cd\u505a\u6cd5\uff1a<\/p>\n

4. \u5982\u679cNAT\u652f\u6301\u56de\u73af\u4f20\u8f93\uff08NAT\u5141\u8bb8\u540c\u4e00\u4e2a\u5185\u7f51\u7684\u4e3b\u673a\u95f4\u76f8\u4e92\u901a\u4fe1\uff09\uff0c\u90a3\u4e48\u76f4\u63a5\u5c06\u6570\u636e\u53d1\u7ed9Client B<\/p>\n

5. \u5982\u679cNAT\u4e0d\u652f\u6301\u56de\u73af\u4f20\u8f93\uff0c\u6709\u53ef\u80fd\u5c06\u8be5\u6570\u636e\u4e22\u5f03<\/p>\n

\u56e0\u4e3a\u4ece\u5185\u90e8\u5230\u8fbeNAT\u7684\u6570\u636e\u4f1a\u88ab\u201c\u56de\u9001\u201d\u5230\u5185\u7f51\u4e2d\u800c\u4e0d\u662f\u8f6c\u53d1\u5230\u5916\u7f51\u3002\u5373\u4fbfNAT\u652f\u6301\u56de\u73af\u4f20\u8f93\uff0c\u8fd9\u79cd\u8f6c\u6362\u548c\u8f6c\u53d1\u5728\u6b64\u60c5\u51b5\u4e0b\u4e5f\u662f\u6ca1\u5fc5\u8981\u7684\uff0c\u4e14\u6709\u53ef\u80fd\u4f1a\u589e\u52a0A\u4e0eB\u7684\u5bf9\u8bdd\u5ef6\u65f6\u548c\u52a0\u91cdNAT\u7684\u8d1f\u62c5\u3002<\/p>\n

 <\/p>\n

\u89e3\u51b3\u4e0a\u8ff0\u95ee\u9898\u4e5f\u5f88\u7b80\u5355\uff1a<\/p>\n

1. \u5f53Client A\u548cClient B\u6700\u521d\u901a\u8fc7Server S\u4ea4\u6362\u5730\u5740\u4fe1\u606f\u65f6\uff0c\u5b83\u4eec\u5305\u542b\u81ea\u8eab\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7\uff08\u4ece\u81ea\u5df1\u770b\uff09\uff0c\u540c\u65f6\u4e5f\u5305\u542b\u4ece\u670d\u52a1\u5668\u770b\u7684\u81ea\u5df1\u7684\u5730\u5740\u548c\u7aef\u53e3\u53f7<\/p>\n

2. Client \u5411\u5bf9\u65b9\u7684\u516c\u7f51\u5730\u5740\u53ca\u5185\u7f51\u5730\u5740\u540c\u65f6\u53d1\u751f\u6570\u636e\uff0c\u5e76\u4f7f\u7528\u7b2c\u4e00\u4e2a\u6210\u529f\u901a\u4fe1\u7684\u5730\u5740\u4f5c\u4e3a\u5bf9\u65b9\u5730\u5740\u3002\u5982\u679c\u4e24\u4e2aClient \u5728\u540c\u4e00\u4e2aNAT\u540e\uff0c\u53d1\u9001\u5230\u5bf9\u65b9\u5185\u7f51\u5730\u5740\u7684\u6570\u636e\u6700\u6709\u53ef\u80fd\u5148\u5230\u8fbe\uff0c\u4ece\u800c\u53ef\u4ee5\u5efa\u7acb\u4e00\u6761\u4e0d\u7ecf\u8fc7NAT\u7684\u901a\u4fe1\u94fe\u8def<\/p>\n

3. \u5982\u679c\u4e24\u4e2aClient \u5728\u4e0d\u540c\u7684NAT\u4e4b\u540e\uff0c\u53d1\u9001\u7ed9\u5bf9\u65b9\u5185\u7f51\u5730\u5740\u7684\u6570\u636e\u5305\u6839\u672c\u5c31\u5230\u8fbe\u4e0d\u4e86\u5bf9\u65b9\uff0c\u4f46\u4ecd\u7136\u53ef\u4ee5\u901a\u8fc7\u516c\u7f51\u5730\u5740\u6765\u5efa\u7acb\u901a\u8def\u3002<\/p>\n

\u503c\u5f97\u4e00\u63d0\u7684\u662f\uff0c\u867d\u7136\u8fd9\u4e9b\u6570\u636e\u5305\u901a\u8fc7\u67d0\u79cd\u65b9\u5f0f\u9a8c\u8bc1\uff0c\u4f46\u662f\u5728\u4e0d\u540cNAT\u7684\u60c5\u51b5\u4e0b\u5b8c\u5168\u6709\u53ef\u80fd\u4f1a\u5bfc\u81f4Client A\u5f80Client B\u53d1\u9001\u7684\u4fe1\u606f\u53d1\u9001\u5230\u5176\u4ed6Client A\u5185\u7f51\u7f51\u6bb5\u4e2d\u65e0\u5173\u7684\u7ed3\u70b9\u4e0a\u53bb\u7684\u3002<\/p>\n

\u56fa\u5b9a\u7aef\u53e3\u7ed1\u5b9a
\nUDP\u6253\u6d1e\u6280\u672f\u6709\u4e00\u4e2a\u4e3b\u8981\u7684\u6761\u4ef6\uff1a\u53ea\u6709\u5f53\u4e24\u4e2aNAT\u90fd\u662fCone NAT\uff08\u6216\u8005\u975eNAT\u7684\u9632\u706b\u5899\uff09\u65f6\u624d\u80fd\u5de5\u4f5c\u3002\u56e0\u4e3a\u5176\u7ef4\u6301\u4e86\u4e00\u4e2a\u7ed9\u5b9a\u7684\uff08\u5185\u7f51IP\uff0c\u5185\u7f51UDP\uff09\u4e8c\u5143\u7ec4\u548c\uff08\u516c\u7f51IP\uff0c \u516c\u7f51UDP\uff09\u4e8c\u5143\u7ec4\u56fa\u5b9a\u7684\u7aef\u53e3\u7ed1\u5b9a\uff0c\u53ea\u8981\u8be5UDP\u7aef\u53e3\u8fd8\u5728\u4f7f\u7528\u4e2d\uff0c\u5c31\u4e0d\u4f1a\u53d8\u5316\u3002\u5982\u679c\u50cf\u5bf9\u79f0NAT\u4e00\u6837\uff0c\u7ed9\u6bcf\u4e2a\u65b0\u4f1a\u8bdd\u5206\u914d\u4e00\u4e2a\u65b0\u7684\u516c\u7f51\u7aef\u53e3\uff0c\u5c31\u4f1a\u5bfc\u81f4UDP\u5e94\u7528\u7a0b\u5e8f\u65e0\u6cd5\u4f7f\u7528\u8ddf\u5916\u90e8\u7aef\u70b9\u5df2\u7ecf\u6253\u901a\u4e86\u7684\u901a\u4fe1\u94fe\u8def\u3002\u7531\u4e8eCone NAT\u662f\u5f53\u4eca\u6700\u5e7f\u6cdb\u4f7f\u7528\u7684\uff0c\u5c3d\u7ba1\u6709\u4e00\u5c0f\u90e8\u5206\u7684\u5bf9\u79f0NAT\u662f\u4e0d\u652f\u6301\u6253\u6d1e\u7684\uff0cUDP\u6253\u6d1e\u6280\u672f\u4e5f\u8fd8\u662f\u88ab\u5e7f\u6cdb\u91c7\u7eb3\u5e94\u7528\u3002<\/p>\n

\u7a7a\u95f2\u72b6\u6001\u4e0b\u7684\u8d85\u65f6\u95ee\u9898
\n\u7531\u4e8eUDP\u8f6c\u6362\u534f\u8bae\u63d0\u4f9b\u7684\u201c\u6d1e\u201d\u4e0d\u662f\u7edd\u5bf9\u53ef\u9760\u7684\uff0c\u591a\u6570NAT\u8bbe\u5907\u5185 \u90e8\u90fd\u6709\u4e00\u4e2aUDP\u8f6c\u6362\u7684\u7a7a\u95f2\u72b6\u6001\u8ba1\u65f6\u5668\uff0c\u5982\u679c\u5728\u4e00\u6bb5\u65f6\u95f4\u5185\u6ca1\u6709 UDP\u6570\u636e\u901a\u4fe1\uff0cNAT\u8bbe\u5907\u4f1a\u5173\u6389\u7531\u201c\u6253\u6d1e\u201d\u64cd\u4f5c\u6253\u51fa\u6765\u7684\u201c\u6d1e\u201d\u4f5c\u4e3a\u5e94\u7528\u7a0b\u5e8f\u6765\u8bb2\u5982\u679c\u60f3\u8981\u505a\u5230\u4e0e\u8bbe\u5907\u65e0\u5173\uff0c\u5c31\u6700\u597d\u5728\u7a7f\u8d8aNAT\u540e \u8bbe\u5b9a\u4e00\u4e2a\u7a7f\u8d8a\u7684\u6709\u6548\u671f\u3002\u8fd9\u4e2a\u6709\u6548\u671f\u4e0eNAT\u8bbe\u5907\u5185\u90e8\u7684\u914d\u7f6e\u6709\u5173\uff0c\u76ee\u524d\u6ca1\u6709\u6807\u51c6\u6709\u6548\u671f\uff0c\u6700\u77ed\u7684\u53ea\u670920\u79d2\u5de6\u53f3\u3002\u5728\u8fd9\u4e2a\u6709\u6548\u671f\u5185\uff0c \u5373\u4f7f\u6ca1\u6709P2P\u6570\u636e\u62a5\u6587\u9700\u8981\u4f20\u8f93\uff0c\u5e94\u7528\u7a0b\u5e8f\u4e3a\u4e86\u7ef4\u6301\u8be5\u201c\u6d1e\u201d\u53ef\u4ee5 \u6b63\u5e38\u5de5\u4f5c\uff0c\u4e5f\u5fc5\u987b\u5411\u5bf9\u65b9\u53d1\u9001\u201c\u6253\u6d1e\u201d\u7ef4\u6301\u62a5\u6587\u3002\u8fd9\u4e2a\u7ef4\u6301\u62a5\u6587 \u662f\u9700\u8981\u53cc\u65b9\u5e94\u7528\u90fd\u53d1\u9001\u7684\uff0c\u53ea\u6709\u4e00\u65b9\u53d1\u9001\u4e0d\u4f1a\u7ef4\u6301\u53e6\u4e00\u65b9\u7684\u6620\u5c04 \u5173\u7cfb\u6b63\u5e38\u5de5\u4f5c\u3002\u9664\u4e86\u9891\u7e41\u53d1\u9001\u201c\u6253\u6d1e\u201d\u7ef4\u6301\u62a5\u6587\u4ee5\u5916\uff0c\u8fd8\u6709\u4e00\u4e2a \u65b9\u6cd5\u5c31\u662f\u5728\u5f53\u524d\u7684\u201c\u6d1e\u201d\u6709\u6548\u671f\u8fc7\u671f\u4e4b\u524d\uff0cP2P\u5ba2\u6237\u7aef\u53cc\u65b9\u91cd\u65b0 \u201c\u6253\u6d1e\u201d\uff0c\u4e22\u5f03\u539f\u6709\u7684\u201c\u6d1e\u201d\uff0c\u8fd9\u4e5f\u4e0d\u5931\u4e3a\u4e00\u4e2a\u6709\u6548\u7684\u65b9\u6cd5\u3002<\/p>\n

 <\/p>\n

TCP\u6253\u6d1e
\n\u5efa\u7acb\u7a7f\u8d8aNAT\u8bbe\u5907\u7684P2P\u7684TCP\u8fde\u63a5\u53ea\u6bd4UDP\u590d\u6742\u4e00\u70b9\u70b9\uff0cTCP\u534f\u8bae\u7684 \u201c\u6253\u6d1e\u201d\u4ece\u534f\u8bae\u5c42\u6765\u770b\u662f\u4e0eUDP\u7684\u201c\u6253\u6d1e\u201d\u8fc7\u7a0b\u975e\u5e38\u76f8\u4f3c\u7684\u3002\u5c3d\u7ba1\u5982\u6b64\uff0c\u57fa\u4e8eTCP\u534f\u8bae\u7684\u6253\u6d1e\u81f3\u4eca\u4e3a\u6b62\u8fd8\u6ca1\u6709\u88ab\u5f88\u597d\u7684\u7406\u89e3\uff0c\u8fd9\u4e5f\u9020\u6210\u4e86\u7684\u5bf9\u5176\u63d0\u4f9b\u652f\u6301\u7684NAT\u8bbe\u5907\u4e0d\u662f\u5f88\u591a\u3002\u5728NAT\u8bbe\u5907\u652f\u6301\u7684\u524d\u63d0\u4e0b\uff0c\u57fa\u4e8eTCP\u7684\u201c\u6253\u6d1e\u201d\u6280\u672f\u5b9e\u9645\u4e0a\u4e0e\u57fa\u4e8eUDP\u7684\u201c\u6253\u6d1e\u201d\u6280\u672f\u4e00\u6837\u5feb\u6377\u3001\u53ef\u9760\u3002\u5b9e\u9645\u4e0a\uff0c\u53ea\u8981NAT\u8bbe\u5907\u652f\u6301\u7684\u8bdd\uff0c\u57fa\u4e8eTCP\u7684P2P\u6280\u672f\u7684\u5065\u58ee\u6027\u5c06\u6bd4\u57fa\u4e8eUDP\u6280\u672f\u7684\u66f4\u5f3a\u4e00\u4e9b\uff0c\u56e0\u4e3aTCP\u534f\u8bae\u7684\u72b6\u6001\u673a\u7ed9\u51fa\u4e86\u4e00\u79cd\u6807\u51c6\u7684\u65b9\u6cd5\u6765\u7cbe\u786e\u7684\u83b7\u53d6\u67d0\u4e2aTCP session\u7684\u751f\u547d\u671f\uff0c\u800cUDP\u534f\u8bae\u5219\u65e0\u6cd5\u505a\u5230\u8fd9\u4e00\u70b9\u3002<\/p>\n

\u5957\u63a5\u5b57\u548cTCP\u7aef\u53e3\u7684\u91cd\u7528
\n\u5b9e\u73b0\u57fa\u4e8eTCP\u534f\u8bae\u7684P2P\u6253\u6d1e\u8fc7\u7a0b\u4e2d\uff0c\u6700\u4e3b\u8981\u7684\u95ee\u9898\u4e0d\u662f\u6765\u81ea\u4e8eTCP\u534f\u8bae\uff0c\u800c\u662f\u6765\u81ea\u4e8e\u5e94\u7528\u7a0b\u5e8f\u7684API\u63a5\u53e3\u3002\u8fd9\u662f\u7531\u4e8e\u6807\u51c6\u7684\u4f2f\u514b\u5229(Berkeley)\u5957\u63a5\u5b57\u7684API\u662f\u56f4\u7ed5\u7740\u6784\u5efaClient \/\u670d\u52a1\u5668\u7a0b\u5e8f\u800c\u8bbe\u8ba1\u7684\uff0cAPI\u5141\u8bb8TCP\u5957\u63a5\u5b57\u901a\u8fc7\u8c03\u7528connect()\u51fd\u6570\u6765\u5efa\u7acb\u5411\u5916\u7684\u8fde\u63a5\uff0c\u6216\u8005\u901a\u8fc7listen()\u548caccept\u51fd\u6570\u63a5\u53d7\u6765\u81ea\u5916\u90e8\u7684\u8fde\u63a5\uff0c\u4f46\u662f\uff0cAPI\u4e0d\u63d0\u4f9b\u7c7b\u4f3cUDP\u90a3\u6837\u7684\uff0c\u540c\u4e00\u4e2a\u7aef\u53e3\u65e2\u53ef\u4ee5\u5411\u5916\u8fde\u63a5\uff0c\u53c8\u80fd\u591f\u63a5\u53d7\u6765\u81ea\u5916\u90e8\u7684\u8fde\u63a5\u3002\u800c\u4e14\u66f4\u7cdf\u7684\u662f\uff0cTCP\u7684\u5957\u63a5\u5b57\u901a\u5e38\u4ec5\u5141\u8bb8\u5efa\u7acb1\u5bf91\u7684\u54cd\u5e94\uff0c\u5373\u5e94\u7528\u7a0b\u5e8f\u5728\u5c06\u4e00\u4e2a\u5957\u63a5\u5b57\u7ed1\u5b9a\u5230\u672c\u5730\u7684\u4e00\u4e2a\u7aef\u53e3\u4ee5\u540e\uff0c\u4efb\u4f55\u8bd5\u56fe\u5c06\u7b2c\u4e8c\u4e2a\u5957\u63a5\u5b57\u7ed1\u5b9a\u5230\u8be5\u7aef\u53e3\u7684\u64cd\u4f5c\u90fd\u4f1a\u5931\u8d25\u3002<\/p>\n

\u4e3a\u4e86\u8ba9TCP\u6253\u6d1e\u80fd\u591f\u987a\u5229\u5de5\u4f5c\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528\u4e00\u4e2a\u672c\u5730\u7684TCP\u7aef\u53e3\u6765\u76d1\u542c\u6765\u81ea\u5916\u90e8\u7684TCP\u8fde\u63a5\uff0c\u540c\u65f6\u5efa\u7acb\u591a\u4e2a\u5411\u5916\u7684TCP\u8fde\u63a5\uff08\u901a\u8fc7SO_REUSEADDR\u3001SO_REUSEADDR\uff09\u3002<\/p>\n

\u6253\u5f00P2P\u7684TCP\u6d41
\n\u5047\u5b9aClient A\u5e0c\u671b\u5efa\u7acb\u4e0eClient B\u7684TCP\u8fde\u63a5\uff08Client A\u548cClient B\u5df2\u7ecf\u4e0e\u516c\u7f51\u4e0a\u7684\u670d\u52a1\u5668\u5efa\u7acb\u4e86TCP\u8fde\u63a5\uff09\uff0c\u6b65\u9aa4\u4e3a\uff1a<\/p>\n

1. Client A\u4f7f\u7528\u5176\u4e0e\u670d\u52a1\u5668\u7684\u8fde\u63a5\u5411\u670d\u52a1\u5668\u53d1\u9001\u8bf7\u6c42\uff0c\u8981\u6c42\u670d\u52a1\u5668\u534f\u52a9\u5176\u8fde\u63a5Client B\uff1b<\/p>\n

2. \u670d\u52a1\u5668\u5c06Client B\u7684\u516c\u7f51\u548c\u5185\u7f51\u7684TCP\u5730\u5740\u7684\u4e8c\u5143\u7ec4\u4fe1\u606f\u8fd4\u56de\u7ed9A\uff0c\u540c\u65f6\uff0c\u670d\u52a1\u5668\u5c06Client A\u7684\u516c\u7f51\u548c\u5185\u7f51\u7684\u5730\u5740\u4e8c\u5143\u7ec4\u4e5f\u53d1\u9001\u7ed9Client B\uff1b<\/p>\n

3. Client A\u548cClient B\u4f7f\u7528\u8fde\u63a5\u670d\u52a1\u5668\u7684\u7aef\u53e3\u5f02\u6b65\u5730\u53d1\u8d77\u5411\u5bf9\u65b9\u7684\u516c\u7f51\u3001\u5185\u7f51\u5730\u5740\u4e8c\u5143\u7ec4\u7684TCP\u8fde\u63a5\uff0c\u540c\u65f6\u76d1\u542c\u5404\u81ea\u7684\u672c\u5730TCP\u7aef\u53e3\u662f\u5426\u6709\u5916\u90e8\u7684\u8fde\u63a5\u8054\u5165\uff1b<\/p>\n

4. Client A\u548cClient B\u5f00\u59cb\u7b49\u5f85\u5411\u5916\u7684\u8fde\u63a5\u662f\u5426\u6210\u529f\uff0c\u68c0\u67e5\u662f\u5426\u6709\u65b0\u8fde\u63a5\u8054\u5165\u3002\u5982\u679c\u5411\u5916\u7684\u8fde\u63a5\u7531\u4e8e\u67d0\u79cd\u7f51\u7edc\u9519\u8bef\u800c\u5931\u8d25\uff0c\u5982\uff1a\u201c\u8fde\u63a5\u88ab\u91cd\u7f6e\u201d\u6216\u8005\u201c\u8282\u70b9\u65e0\u6cd5\u8bbf\u95ee\u201d\uff0cClient \u53ea\u9700\u8981\u5ef6\u8fdf\u4e00\u6bb5\u65f6\u95f4\uff08\u4f8b\u5982\u5ef6\u8fdf\u4e00\u79d2\u949f\uff09\uff0c\u7136\u540e\u91cd\u65b0\u53d1\u8d77\u8fde\u63a5\u5373\u53ef\uff0c\u5ef6\u8fdf\u7684\u65f6\u95f4\u548c\u91cd\u590d\u8fde\u63a5\u7684\u6b21\u6570\u53ef\u4ee5\u7531\u5e94\u7528\u7a0b\u5e8f\u7f16\u5199\u8005\u6765\u786e\u5b9a\uff1b<\/p>\n

5. TCP\u8fde\u63a5\u5efa\u7acb\u8d77\u6765\u4ee5\u540e\uff0cClient \u4e4b\u95f4\u5e94\u8be5\u5f00\u59cb\u9274\u6743\u64cd\u4f5c\uff0c\u786e\u4fdd\u76ee\u524d\u8054\u5165\u7684\u8fde\u63a5\u5c31\u662f\u6240\u5e0c\u671b\u7684\u8fde\u63a5\u3002\u5982\u679c\u9274\u6743\u5931\u8d25\uff0cClient \u5c06\u5173\u95ed\u8fde\u63a5\uff0c\u5e76\u4e14\u7ee7\u7eed\u7b49\u5f85\u65b0\u7684\u8fde\u63a5\u8054\u5165\u3002Client \u901a\u5e38\u91c7\u7528\u201c\u5148\u5165\u4e3a\u4e3b\u201d\u7684\u7b56\u7565\uff0c\u53ea\u63a5\u53d7\u7b2c\u4e00\u4e2a\u901a\u8fc7\u9274\u6743\u64cd\u4f5c\u7684Client \uff0c\u7136\u540e\u5c06\u8fdb\u5165P2P\u901a\u4fe1\u8fc7\u7a0b\u4e0d\u518d\u7ee7\u7eed\u7b49\u5f85\u662f\u5426\u6709\u65b0\u7684\u8fde\u63a5\u8054\u5165\u3002<\/p>\n

\u56fe 5 TCP\u6253\u6d1e\u6d41\u7a0b\u56fe
\n\u4e0eUDP\u4e0d\u540c\u7684\u662f\uff0c\u56e0\u4e3a\u4f7f\u7528UDP\u534f\u8bae\u7684\u6bcf\u4e2aClient \u53ea\u9700\u8981\u4e00\u4e2a\u5957\u63a5\u5b57\u5373\u53ef\u5b8c\u6210\u4e0e\u670d\u52a1\u5668\u7684\u901a\u4fe1\uff0c\u800cTCP Client \u5fc5\u987b\u5904\u7406\u591a\u4e2a\u5957\u63a5\u5b57\u7ed1\u5b9a\u5230\u540c\u4e00\u4e2a\u672c\u5730TCP\u7aef\u53e3\u7684\u95ee\u9898\u3002\u73b0\u5728\u6765\u770b\u5b9e\u9645\u4e2d\u5e38\u89c1\u7684\u4e00\u79cd\u60c5\u666f\uff0cA\u4e0eB\u5206\u522b\u4f4d\u4e8e\u4e0d\u540c\u7684NAT\u8bbe\u5907\u540e\u9762\uff0c\u5982\u56fe 3\u6240\u793a\uff0c\u5e76\u4e14\u5047\u5b9a\u56fe\u4e2d\u7684\u7aef\u53e3\u53f7\u662fTCP\u534f\u8bae\u7684\u7aef\u53e3\u53f7\uff0c\u800c\u4e0d\u662fUDP\u7684\u7aef\u53e3\u53f7\u3002\u56fe\u4e2d\u5411\u5916\u7684\u8fde\u63a5\u4ee3\u8868Client A\u548cClient B\u5411\u5bf9\u65b9\u7684\u5185\u7f51\u5730\u5740\u4e8c\u5143\u7ec4\u53d1\u8d77\u7684\u8fde\u63a5\uff0c\u8fd9\u4e9b\u8fde\u63a5\u6216\u8bb8\u4f1a\u5931\u8d25\u6216\u8005\u65e0\u6cd5\u8fde\u63a5\u5230\u5bf9\u65b9\u3002\u5982\u540c\u4f7f\u7528UDP\u534f\u8bae\u8fdb\u884c\u201c\u6253\u6d1e\u201d\u64cd\u4f5c\u9047\u5230\u7684\u95ee\u9898\u4e00\u6837\uff0cTCP\u7684\u201c\u6253\u6d1e\u201d\u64cd\u4f5c\u4e5f\u4f1a\u9047\u5230\u5185\u7f51\u7684IP\u4e0e\u201c\u4f2a\u201d\u516c\u7f51IP\u91cd\u590d\u9020\u6210\u8fde\u63a5\u5931\u8d25\u6216\u8005\u9519\u8bef\u8fde\u63a5\u4e4b\u7c7b\u7684\u95ee\u9898\u3002<\/p>\n

Client \u5411\u5f7c\u6b64\u516c\u7f51\u5730\u5740\u4e8c\u5143\u7ec4\u53d1\u8d77\u8fde\u63a5\u7684\u64cd\u4f5c\uff0c\u4f1a\u4f7f\u5f97\u5404\u81ea\u7684NAT\u8bbe\u5907\u6253\u5f00\u65b0\u7684\u201c\u6d1e\u201d\u5141\u8bb8Client A\u4e0eClient B\u7684TCP\u6570\u636e\u901a\u8fc7\u3002\u5982\u679cNAT\u8bbe\u5907\u652f\u6301TCP\u201c\u6253\u6d1e\u201d\u64cd\u4f5c\u7684\u8bdd\uff0c\u4e00\u4e2a\u5728Client \u4e4b\u95f4\u7684\u57fa\u4e8eTCP\u534f\u8bae\u7684\u6d41\u901a\u9053\u5c31\u4f1a\u81ea\u52a8\u5efa\u7acb\u8d77\u6765\u3002\u5982\u679cClient A\u5411Client B\u53d1\u9001\u7684\u7b2c\u4e00\u4e2aSYN\u5305\u53d1\u5230\u4e86Client B\u7684NAT\u8bbe\u5907\uff0c\u800cClient B\u5728\u6b64\u524d\u6ca1\u6709\u5411Client A\u53d1\u9001SYN\u5305\uff0cClient B\u7684NAT\u8bbe\u5907\u4f1a\u4e22\u5f03\u8fd9\u4e2a\u5305\uff0c\u8fd9\u4f1a\u5f15\u8d77A\u7684\u201c\u8fde\u63a5\u5931\u8d25\u201d\u6216\u201c\u65e0\u6cd5\u8fde\u63a5\u201d\u95ee\u9898\u3002\u800c\u6b64\u65f6\uff0c\u7531\u4e8eClient A\u5df2\u7ecf\u5411Client B\u53d1\u9001\u8fc7SYN\u5305\uff0cClient B\u53d1\u5f80Client A\u7684SYN\u5305\u5c06\u88ab\u770b\u4f5c\u662f\u7531Client A\u53d1\u5f80Client B\u7684\u5305\u7684\u56de\u5e94\u7684\u4e00\u90e8\u5206\uff0c\u6240\u4ee5Client B\u53d1\u5f80Client A\u7684SYN\u5305\u4f1a\u987a\u5229\u5730\u901a\u8fc7Client A\u7684NAT\u8bbe\u5907\uff0c\u5230\u8fbeClient A\uff0c\u4ece\u800c\u5efa\u7acb\u8d77Client A\u4e0eClient B\u7684P2P\u8fde\u63a5\u3002<\/p>\n

TCP\u540c\u65f6\u6253\u5f00
\n\u6709\u4e00\u79cd\u7279\u6b8a\u7684TCP P2P\u6253\u6d1e\u573a\u666f\uff1a\u5047\u5b9a\u5404\u7ec8\u7aef\u7684TCP\u8fde\u63a5\u542f\u52a8\u65f6\u95f4\u6bd4\u8f83\u5de7\u5408\uff0c\u4f7f\u5f97\u4ed6\u4eec\u5404\u81ea\u53d1\u9001\u7684 SYN\u62a5\u6587\uff0c\u5728\u5230\u8fbe\u5bf9\u65b9\u7684NAT\u8bbe\u5907\u4e4b\u524d\uff0c\u5bf9\u65b9\u7684SYN\u62a5\u6587\u90fd\u5df2\u7ecf \u7a7f\u8d8aNAT\u8bbe\u5907\uff0c\u5e76\u5728NAT\u8bbe\u5907\u4e0a\u751f\u6210TCP\u6620\u5c04\u5173\u7cfb\u3002\u5728\u8fd9\u79cd\u201c\u5e78 \u8fd0\u201d\u7684\u60c5\u51b5\u4e0b\uff0cNAT\u8bbe\u5907\u4e0d\u4f1a\u62d2\u7eddSYN\u62a5\u6587\uff0c\u53cc\u65b9\u7684SYN\u62a5\u6587\u90fd \u80fd\u901a\u8fc7\u7ec8\u7aef\u95f4\u7684NAT\u8bbe\u5907\uff0c\u5230\u8fbe\u5bf9\u65b9\u3002\u6b64\u65f6\uff0c\u7ec8\u7aef\u4f1a\u53d1\u73b0TCP\u8fde \u63a5\u540c\u65f6\u6253\u5f00\uff0c\u6bcf\u4e2a\u7ec8\u7aef\u7684TCP\u8fd4\u56deSYN-ACK\u62a5\u6587\uff0c\u62a5\u6587\u7684SYN \u90e8\u5206\u5fc5\u987b\u4e0e\u4e4b\u524d\u53d1\u9001\u7684SYN\u62a5\u6587\u4e00\u6837\uff0c\u800cACK\u90e8\u5206\u544a\u77e5\u5bf9\u65b9\u5230\u8fbe\u7684SYN\u4fe1\u606f\u3002<\/p>\n

\u4e3a\u4ec0\u4e48\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u5efa\u7acbTCP\u8fde\u63a5\u5462\uff1f\u8fd9\u662f\u56e0\u4e3aTCP\u4e09\u6b21\u63e1\u624b\u4e2d\u6709\u4e00\u79cd\u7279\u6b8a\u7684\u573a\u666f\uff1a\u901a\u4fe1\u53cc\u65b9\u540c\u65f6\u5728\u76f8\u540c\u7aef\u53e3\u6253\u5f00\u8fde\u63a5\u7684\u573a\u666f\uff0c\u5982\u56fe 6\u6240\u793a\uff1a<\/p>\n

\u56fe 6 TCP\u540c\u65f6\u6253\u5f00\u8fde\u63a5
\n\u53c2\u8003\u8d44\u6599
\nhttp:\/\/www.h3c.com\/cn\/MiniSite\/Technology_Circle\/Net_Reptile\/ \u7b2c\u4e94\u671f\uff08NAT\u4e13\u9898\uff09<\/p>\n

p2p\u901a\u4fe1\u539f\u7406\u53ca\u5b9e\u73b0<\/p>\n

P2P\u7684\u539f\u7406\u548c\u5e38\u89c1\u7684\u5b9e\u73b0\u65b9\u5f0f(\u4e3alibjingle\u5f00\u8def)
\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014
\n\u7248\u6743\u58f0\u660e\uff1a\u672c\u6587\u4e3aCSDN\u535a\u4e3b\u300cCoderAndClimber\u300d\u7684\u539f\u521b\u6587\u7ae0\uff0c\u9075\u5faaCC 4.0 BY-SA\u7248\u6743\u534f\u8bae\uff0c\u8f6c\u8f7d\u8bf7\u9644\u4e0a\u539f\u6587\u51fa\u5904\u94fe\u63a5\u53ca\u672c\u58f0\u660e\u3002
\n\u539f\u6587\u94fe\u63a5\uff1ahttps:\/\/blog.csdn.net\/u014023993\/article\/details\/86563976<\/p>\n","protected":false},"excerpt":{"rendered":"

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