August 24, 2010 by LostRiver<\/p>\n
\u4f7f\u7528OpenVPN\u4e00\u6bb5\u65f6\u95f4\uff0c\u53d1\u73b0Windows\u5ba2\u6237\u7aef\u901f\u5ea6\u4e00\u76f4\u8fdc\u5c0f\u4e8eLinux\u5ba2\u6237\u7aef\u3002\u6211\u7684\u7f51\u7edc\u73af\u5883\u4e24\u8fb9\u90fd\u662f\u767e\u5146 IPv6\u5171\u4eab\u63a5\u5165\u670d\u52a1\u7aef\u662fOpenVZ VPS\u3002linux\u4e0b\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u5355\u4e2aTCP\u8fde\u63a5\u901f\u5ea6\u5728500KB\/s\u4e0a\u4e0b\u6ce2\u52a8\uff0c\u901a\u8fc7OpenVPN\u540e\u901f\u5ea6\u5dee\u522b\u4e0d\u5927\u3002\u672a\u4f18\u5316\u65f6\uff0cWindows\u4e0b\u901f\u5ea6\u660e\u663e\u964d\u4f4e\uff0c\u5168\u5c40\u4e0b\u8f7d\u5e26\u5bbd\u53ea\u80fd\u5230100KB\/s\u5de6\u53f3\u3002\u4f18\u5316\u540e\u90e8\u5206\u95ee\u9898\u80fd\u591f\u5f97\u5230\u660e\u663e\u6539\u5584\u3002<\/p>\n
OpenVPN\u6709TCP\u548cUDP\u4e24\u79cd\u8fde\u63a5\u65b9\u5f0f\uff0c\u867d\u7136OpenVPN over TCP\u4e0d\u88ab\u63a8\u8350\u3002
\u4f18\u5316Windows TCP\u63a5\u6536\u7a97\u53e3(RWIN)<\/p>\n
\u4f5c\u7528\u6709\u4e8c\uff0c\u4f18\u5316\u8fd0\u884c\u4e8eOpenVPN\u4e0a\u7684TCP\u8fde\u63a5\uff0c\u5728\u4f7f\u7528TCP\u6a21\u5f0f\u65f6\u4f18\u5316OpenVPN\u6240\u4f7f\u7528\u7684TCP\u8fde\u63a5\u3002\u8fd9\u91ccVista\/Win7\u65e0\u9700\u4f18\u5316\u3002<\/p>\n
Windows\u4e0b\u60c5\u51b5\u6709\u4e9b\u590d\u6742\uff0c\u5bf9\u4e8eIPv6 TCP\uff0cVista\/Win7\u6ca1\u6709\u95ee\u9898\u4f46\u4e4b\u524d\u7248\u672cWindows\u5904\u7406\u5f97\u5f88\u4e0d\u597d\u3002\u9996\u5148Windows Server 2003\u7cfb\u7edf\u4e0b\u6709\u4e2aBUG\uff0c\u89c1KB966321\uff0c\u7b80\u5355\u8bf4\u88ab\u52a8\u6253\u5f00\u7684TCP\u8fde\u63a5\u63a5\u6536\u7a97\u53e3\u5927\u5c0f\u56fa\u5b9a\u4e3a16384\u4e14\u4e0d\u968f\u6ce8\u518c\u8868\u9879\u76f8\u5e94\u7684\u8bbe\u5b9a\u503c\u5f71\u54cd\u3002\u6211\u53d1\u73b0XP\u60c5\u51b5\u66f4\u574f\uff0c\u6240\u6709IPv6 TCP\u8fde\u63a5\u7a97\u53e3\u5927\u5c0f\u90fd\u56fa\u5b9a\u4e3a\u6700\u592744800\uff0c\u5728\u6211\u8fd9\u91cc260ms\u7684RTT\u4e0b\uff0c\u5355IPv6 TCP\u8fde\u63a5\u7684\u5e26\u5bbd\u6700\u5927\u53ea\u6709\u7ea6160KB\/s\uff0c\u8be5\u95ee\u9898\u5c1a\u672a\u89e3\u51b3\u3002\u5fae\u8f6f\u5e76\u672a\u53d1\u5e03Win32 XP\u5e73\u53f0\u7684\u8865\u4e01\u3002<\/p>\n
\u5173\u4e8eRTT\u3001TCP\u7a97\u53e3\u548c\u6700\u5927\u5e26\u5bbd\u7684\u5173\u7cfb\uff0c\u5728IP\u6570\u636e\u5305\u6ca1\u6709\u53d1\u751f\u5931\u5e8f\u7684\u60c5\u51b5\u4e0b\uff0c\u6700\u5927\u5e26\u5bbd\u53d1\u751f\u5728RTT\u65f6\u95f4\u5185\u5bf9\u65b9\u53d1\u9001\u6570\u636e\u6d41\u586b\u6ee1\u6574\u4e2aTCP\u63a5\u6536\u7a97\u53e3\uff0c\u6bd4\u5982\u6211\u7684\u60c5\u51b5\uff0c<\/p>\n
\u6700\u5927\u5e26\u5bbd=RWIN\/RTT=44800Bytes\/260ms=168KB\/s\uff0c<\/p>\n
\u4e0e\u5b9e\u6d4b\u63a5\u8fd1\u3002<\/p>\n
Windows\u4e0bIPv4 TCP\u4e5f\u53ef\u80fd\u5b58\u5728\u95ee\u9898\uff0cXP\u9ed8\u8ba4\u6ca1\u6709\u5f00\u542fTCP\u7a97\u53e3\u6269\u5927\u9009\u9879\uff0c\u6700\u5927\u7a97\u53e3\u9650\u5236\u4e3a65535\uff0c\u5f80\u8fd4\u65f6\u95f4RTT=260ms\u65f6\uff0c<\/p>\n
\u5355TCP\u8fde\u63a5\u5e26\u5bbd=65536Bytes\/260ms=246KB\/s<\/p>\n
\u5982\u4f55\u8c03\u6574\u7a97\u53e3\u5927\u5c0f\u53ca\u5f00\u542f\u7a97\u53e3\u6269\u5927\u9009\u9879\u89c1KB224829\uff0c\u4e5f\u53ef\u7528TCP Optimizer\uff0c\u8c03\u6574\u540e\uff0c\u5355TCP\u8fde\u63a5\u901f\u5ea6\u4e0eLinux\u63a5\u8fd1\u3002\u5982\u4e0a\u6240\u8ff0\uff0c\u8be5\u65b9\u6cd5\u5bf9IPv6 TCP\u65e0\u6548\u3002Vista\/Win7\u7cfb\u5217\u65e0\u9700\u4fee\u6539\uff0c\u7a97\u53e3\u6269\u5927\u9009\u9879\u9ed8\u8ba4\u5df2\u7ecf\u6253\u5f00\u3002
\u4f18\u5316OpenVPN\u63a5\u6536\u7f13\u51b2\u533a\u5927\u5c0f<\/p>\n
\u8fd9\u4e2a\u4f18\u5316\u53ef\u4ee5\u907f\u514dWin32\u4e0bOpenVPN\u7684UDP\u63a5\u53e3\u9ed8\u8ba4\u7f13\u51b2\u592a\u5c0f\uff0c\u5bfc\u81f4\u4e22\u5305\u7684\u95ee\u9898\u3002\u65e0\u8bba\u662fXP\/Vista\/Win7\uff0c\u90fd\u5efa\u8bae\u8bbe\u7f6e\u3002<\/p>\n
\u4f7f\u7528IPv4 UDP\u6216IPv6 UDP\u6a21\u5f0f\u5e94\u8be5\u4fee\u6539rcvbuf\uff0c\u5728OpenVPN\u7684\u914d\u7f6e\u6587\u4ef6\u4e2d\u52a0\u5165<\/p>\n
rcvbuf 65536<\/p>\n
rcvbuf\u6700\u5927\u53ef\u53d6\u5230999999\uff0c\u8d85\u8fc7\u8fd9\u4e2a\u503c\u6216\u8005\u672a\u8bbe\u5b9a\uff0crcvbuf=8192\u3002<\/p>\n
rcvbuf\u9009\u9879\u6307Windows UDP\u5957\u63a5\u5b57\u7684\u63a5\u6536\u7f13\u51b2\u533a\u5927\u5c0f\u3002\u5bf9OpenVPN\u901f\u5ea6\u5f71\u54cd\u975e\u5e38\u660e\u663e\uff0c\u5c24\u5176\u5bf9\u4e8e\u5355\u6838\u5904\u7406\u5668\u3002\u6211\u7684PC\u662f2003\u5e74\u7684Pentium 4-M\uff0c\u5728\u4f18\u5316\u524d\u6574\u4f53\u901f\u5ea6\u5f88\u96be\u8d85\u8fc7100KB\/s\uff0c\u800c\u6b64\u65f6\u52a0\u4e0a\u5176\u4ed6\u5e94\u7528\uff0cCPU\u4f7f\u7528\u7387\u8fd8\u4e0d\u523030%\u3002\u4f18\u5316\u540e\u4e0elinux\u4e0b\u63a5\u8fd1(~500KB\/s)\u3002\u8bbe\u7f6e\u8fc7\u5c0f\u5f71\u54cd\u901f\u5ea6\u7684\u539f\u56e0\u53ef\u80fd\u662f\u5185\u6838\u63a5\u6536UDP\u6570\u636e\u5305\u8fc7\u5feb\u586b\u6ee1\u7f13\u51b2\u533a\u800cOpenVPN\u5c1a\u672a\u53bb\u8bfb\u53d6\u9020\u6210\u4e22\u5305\u3002
\u8bbe\u7f6eOpenVPN\u7684mssfix\u9009\u9879<\/p>\n
\u5efa\u8bae\u8bbe\u7f6eOpenVPN\u7684mssfix\u9009\u9879\uff0c\u8fd9\u4e2a\u9009\u9879\u9650\u5236VPN\u96a7\u9053\u4e0a\u7684TCP\u8fde\u63a5\u7684MSS(Maximum Segment Size)(OpenVPN\u7684mssfix\u4e0eTCP\u7684mssfix\u4f3c\u4e4e\u5e76\u4e0d\u7b49\u540c\uff0c\u5177\u4f53\u8fd8\u662f\u53c2\u8003OpenVPN\u5b98\u65b9\u6587\u6863)\u3002\u4ee5\u6211\u7684\u60c5\u51b5\u4e3a\u4f8b\uff0c\u670d\u52a1\u5668\u7aef\u7f51\u5361 venet0\u7684MTU\u4e3a1500\uff0cIPv6\u7531TunnelBroker\u63a5\u5165\uff0c\u6545IPv6\u6700\u5927\u5305\u957f\u7b49\u4e8e1500\u51cf\u53bb\u5c01\u88c5\u5176\u768420\u5b57\u8282IP\u9996\u90e8\u7b49\u4e8e1480\uff0c\u518d\u51cf\u53bbIPv6\u768440\u5b57\u8282\u9996\u90e8\u7b49\u4e8e1440\uff0c\u7136\u540e\u5219\u51cf\u53bb8\u5b57\u8282UDP\u9996\u90e8\u7b49\u4e8e1432\u3002\u82e5\u4e3aIPv4 UDP\uff0cmssfix\u7b49\u4e8e1500\u51cf\u53bb20\u5b57\u8282IP\u9996\u90e8\u518d\u51cf\u53bb8\u5b57\u8282UDP\u9996\u90e8\u7b49\u4e8e1472\u3002<\/p>\n
#for UDP6
mssfix 1432<\/p>\n
#for UDP
mssfix 1472<\/p>\n
\u8bbe\u7f6e\u540e\u53ef\u9632\u6b62\u5355\u4e2aIP\u7247\u7ecf\u8fc7OpenVPN\u65f6\u88ab\u518d\u6b21\u5206\u4e24\u4e2a\u6570\u636e\u5305\u53d1\u9001\u3002\u4f46\u5bf9\u4e8e\u4e22\u5305\u7387\u6781\u4f4e\u7684\u94fe\u8def\uff0c\u4f18\u5316mssfix\u4f5c\u7528\u4e0d\u5927\u3002
\u4f7f\u7528\u8def\u7531\u8868<\/p>\n
\u914d\u5408\u8def\u7531\u8868\uff0c\u5c06\u9700\u8981\u7684\u6d41\u91cf\u5bfc\u5165VPN\u3002\u4ee5\u524d\u63d0\u8fc7\u52a8\u6001\u8def\u7531RIP over OpenVPN\u5076\u5c14\u4f1a\u4e0d\u7a33\u5b9a\uff0c\u5efa\u8bae\u8fd8\u662f\u4f7f\u7528\u9759\u6001\u8def\u7531\uff1a<\/p>\n
route.exe -p ADD 8.0.0.0 MASK 252.0.0.0 10.8.0.5 METRIC 40<\/p>\n
\u8981\u6c42\u670d\u52a1\u7aef\u914d\u7f6e\u6587\u4ef6\u4f7f\u7528ccd\u56fa\u5b9a\u6bcf\u4e2a\u5ba2\u6237\u7684IP\u5730\u5740\u4e0e\u7f51\u5173\u5730\u5740\uff0c<\/p>\n
client-config-dir ccd<\/p>\n
\u670d\u52a1\u5668ccd\u6587\u4ef6\u5939\u4e0b\u5efa\u7acbclinet1\uff0c\u5185\u5bb9\uff1a<\/p>\n
ifconfig-push 10.8.0.6 10.8.0.5<\/p>\n
\u5f53VPN\u8fde\u63a5\u65f6\uff0c\u9759\u6001\u8def\u7531\u7531\u4e8eTAP-Win32\u8bbe\u5907\u7684\u6253\u5f00\u800c\u81ea\u52a8\u751f\u6548\uff0c\u5173\u95ed\u65f6\u76f8\u5e94\u9759\u6001\u8def\u7531\u4e0d\u8d77\u4f5c\u7528\uff0c\u4ecd\u4f7f\u7528\u539f\u8def\u7531\/\u9ed8\u8ba4\u7f51\u5173\u3002\u9759\u6001\u8def\u7531\u4fdd\u5b58\u4e8e\u6ce8\u518c\u8868<\/p>\n
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\PersistentRoutes<\/p>\n
\u4e0d\u968f\u63a5\u53e3\u542f\u52a8\/\u65ad\u5f00\u6216\u5173\u673a\u800c\u6d88\u5931\u3002
\u51e0\u4e2a\u7ec6\u8282<\/p>\n
\u65e0\u8bba\u662f\u670d\u52a1\u7aef\u8fd8\u662f\u5ba2\u6237\u7aef\uff0cOpenVPN\u7684verb\u9009\u9879\u90fd\u4e0d\u5e94\u8fc7\u5927\uff0cverb\u63d0\u4f9bDebug\u4fe1\u606f\uff0c\u8fc7\u5927\u53ef\u80fd\u5bfc\u81f4Debug\u4fe1\u606f\u7684\u5199\u5165\u5360\u7528\u8fc7\u591a\u78c1\u76d8IO\u6216\u8005CPU\u8d44\u6e90\u3002<\/p>\n
\u5f00\u542fcomp-lzo\uff0c\u672c\u8eab\u9488\u5bf9\u6570\u636e\u5305\u7684lzo\u7684\u538b\u7f29\u7387\u5e76\u4e0d\u597d\uff0c\u4f46\u662f\u5982\u679c\u5927\u91cf\u7a7a\u767d\u6570\u636e\u5728\u4f20\u8f93\u7684\u8bdd\uff0c\u4f5c\u7528\u8fd8\u662f\u975e\u5e38\u660e\u663e\u7684\u3002
\u610f\u4e49<\/p>\n
\u4e0d\u4f7f\u7528OpenVPN\u65f6\uff0c\u4e0b\u8f7d\u6709\u591a\u7ebf\u7a0b\u5de5\u5177\uff0c\u89c6\u9891\u7f51\u7ad9\u6709CDN\u52a0\u901f\uff0cRWIN\u548cRTT\u7684\u9650\u5236\u90fd\u88ab\u5f88\u597d\u5730\u907f\u514d\u4e86\u3002\u7136\u800cOpenVPN\u9700\u8981\u5c06\u6240\u6709\u6d41\u91cf\u5168\u90e8\u7ecf\u7531\u5355\u4e2aUDP\/TCP\u8fde\u63a5\u4f20\u8f93\uff0c\u4fdd\u8bc1\u5355\u4e2a\u63a5\u53e3\/\u8fde\u63a5\u7684\u541e\u5410\u7387\u5c31\u975e\u5e38\u91cd\u8981\u4e86\u3002<\/p>\n
===================
jaleo says:
September 23, 2010 at 11:08 pm<\/p>\n
\u591a\u8c22\uff0c\u6309\u4f60\u63d0\u4f9b\u7684\u94fe\u63a5\uff0c\u5f97\u5230\u4fe1\u606f\u662f\uff1a
MTU = 1452
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput. If you are using a router, it could be limiting your MTU regardless of Registry settings.
MSS = 1412
MSS is not optimized for broadband. Consider increasing your MTU value.<\/p>\n
\u8fd9\u91cc\u6211\u6709\u7591\u95ee\uff0c\u6211\u7528\u8fd9\u4e2a\u7f51\u7ad9\u63d0\u4f9b\u7684TCPOptimizer\u5de5\u5177\u6d4b\u5f97MTU\u662f1492\uff0c\u4e3a\u4f55\u548c\u9875\u9762\u68c0\u6d4b\u7684\u4e0d\u4e00\u6837\uff1f\u4f1a\u4e0d\u4f1a\u662f\u6211\u7528\u4e86\u65e0\u7ebf\u8def\u7531\u5668\u7684\u5173\u7cfb\uff0cMTU\u7531\u8def\u7531\u5668\u51b3\u5b9a\uff0c\u4e0d\u7ba1OS\u4e0b\u8bbe\u7f6e\u5982\u4f55\uff1f
Reply<\/p>\n
*
LostRiver says:
September 24, 2010 at 2:24 am<\/p>\n
@jaleo ,
\u8f6f\u4ef6\u53d1\u9001\u591a\u4e2aping\u5305\u6d4b\u5f97\u7684MTU\u662f\u771f\u5b9eMTU\uff0c\u7f51\u7ad9\u6d4b\u8bd5MTU\u5229\u7528\u4e86TCP\u534f\u8bae\u7684MTU\u53d1\u73b0\u673a\u5236\uff0c\u770b\u8d77\u6765speedguide\u7f51\u7ad9\u786e\u5b9aMTU\u662f\u8bbe\u7f6e DF\u6bd4\u7279\uff0c\u4e09\u6b21\u63e1\u624b\u65f6\u89c2\u5bdfTCP\u7684MSS\uff0c\u7136\u540e\u6d4f\u89c8\u5668\u53d1\u9001\u4e00\u4e2a\u8db3\u4ee5\u5bfc\u81f4\u5206\u5f00\u4f20\u9001\u7684\u6570\u636e\u6bb5\uff0c\u786e\u5b9aMTU\u3002\u8fd9\u4e2aMTU\u867d\u7136\u53ef\u80fd\u8f83\u5c0f\u4f46\u662f\u786e\u662fTCP\u534f\u8bae\u771f\u6b63\u5229\u7528\u7684MTU\u3002
1492\u5df2\u7ecf\u662fPPPoE\u534f\u8bae\u53ef\u80fd\u8fbe\u5230\u7684MTU\u7684\u6700\u5927\u503c\u3002MTU\u5f53\u7136\u7531\u94fe\u8def\u4e2d\u6700\u5c0f\u7684\u4e00\u4e2a\u51b3\u5b9a\u3002
speedguide\u7f51\u7ad9\u7ed9\u51fa\u7684MSS\u662f\u5ba2\u6237\u7aef\u53d1\u7ed9\u7f51\u7ad9\u7684TCP\u9996\u90e8\u4e2d\u58f0\u660e\u7684TCP MSS\uff0c\u4e00\u822c\u662f\u7cfb\u7edf\u628a\u63a5\u53e3MTU\u51cf\u53bb20\u5b57\u8282IP\u9996\u90e8\u548c20\u5b57\u8282TCP\u9996\u90e8\u4f5c\u4e3aMSS\u503c\u3002\u4e0eOpenVPN\u7684mssfix max\u542b\u4e49\u4e0d\u4e00\u6837\u3002OpenVPN\u201cAnnounce to TCP sessions running over the tunnel that they should limit their send packet sizes such that after OpenVPN has encapsulated them, the resulting UDP packet size that OpenVPN sends to its peer will not exceed max bytes. \u201d
\u6211\u611f\u89c9\u5728\u4e22\u5305\u7387\u4e0d\u9ad8\u7684\u7ebf\u8def\u4e0aMSS\u3001MTU\u7684\u95ee\u9898\u53ea\u8981\u4e0d\u53d1\u751f\u4e25\u91cd\u4e22\u5305\u65e0\u9700\u6df1\u7a76(ADSL\u7684\u9971\u548c\u901f\u5ea6\u662f\u5df2\u7ecf\u786e\u5b9a\u7684\u5427)\u3002\u5982\u679c\u5bf9\u6027\u80fd\u4f18\u5316\u6bd4\u8f83\u9ad8\uff0c\u4e00\u5b9a\u8981\u6293\u5305\u9a8c\u8bc1\uff0c\u89c2\u5bdfTCP\u6279\u91cf\u4f20\u8f93\u65f6VPN\u662f\u5426\u5bf9\u4e0a\u5c42\u6570\u636e\u5305\u5206\u7247\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"