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Thread: MTU Ñòîéíîñò
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9th February 2009 16:54 #1
MTU Ñòîéíîñò
Çäðàâåéòå! Íå ñúì ìíîãî íà ÿñíî è çà òîâà ìå èçâèíåòå, àêî ïèøà ãëóïîñòè.
Èíòåðåñóâà ìå, êàê ìîãà äà ñè íàìàëÿ (ôèêñèðàì) ðàçìåð íà ïàêåòèòå. Äî êîëêîòî çíàì, àêî íå ñå çàáëîæäàâàì, òîé ìîæå äà ñå íàìàëè äî 576 áàéòà.
Íàìåðèõ íåùî ïî òåìàòà íî íå ìè å ÿñíî âñè÷êî:
http://support.microsoft.com/kb/314053/MTU
Key: Tcpip\Parameters\Interfaces\ID for Adapter
Value Type: REG_DWORD Number
Valid Range: 68 - the MTU of the underlying network
Default: 0xFFFFFFFF
Description: This parameter overrides the default Maximum Transmission Unit (MTU) for a network interface. The MTU is the maximum packet size in bytes that the transport transmits over the underlying network. The size includes the transport header. An IP datagram can span multiple packets. Values larger than the default value for the underlying network cause the transport to use the network default MTU. Values smaller than 68 cause the transport to use an MTU of 68.
Êîå ìè å MTU ñòîéíîñòòà ïî ïîäðàçáèðàíå è êàêâî äà ðàçáèðàì ïîä 68???
Àêî å îò çíà÷åíèå, ñúì ñ Windows XP SP3, íå ïîëçâàì ðóòåð è èíòåðíåòà ìè å îò ãðàäñêè äîñòàâ÷èê.
Íàäÿâàì ñå, ÷å ëþáîïèòñòâîòî (âúïðîñà) ìè íÿìà äà ñå âúçïðèåìå êàòî ñïàì.
Áëàãîäàðÿ ïðåäâàðèòåëíî.
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10th February 2009 23:58 #2
Åòî òàêà:
HKLM\SYSTEM\CurrentControlSet\Services\T cpip\Parameters\Interfaces\<interface>
MTU="1500" (DWORD, valid range is from 68 to <MTU of network>).
Åòî òè è ëèòåðàòóðà ïî âúïðîñà: http://support.microsoft.com/kb/Q900926
Òîâà å íàé-áúðçèÿ íà÷èí. Îò ÷èñòî ëþáîïèòñòâî, êàêâà å öåëòà íà çàíÿòèåòî ?MCSA, MCSE, MCIPT: Enterprise Admin
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12th February 2009 09:56 #3
68 å àáñîëþòíèÿ ìèíèìóì çà äúëæèíà íà IP ïàêåò, îïðåäåëåí îò ïðîòîêîëà. 576 áàéòà å ìèíèìóìúò, êîéòî å îïðåäåëåí â èçèñêâàíèÿòà êúì èíòåðíåò óñòðîéñòâàòà, ÷å òðÿáâà äà áúäå ïðåäàâàí áåç ôðàãìåíòàöèÿ. Ðàçáèðà ñå òè ìîæåø äà ïðåäàâàø è ïî-ìàëêè ïàêåòè îò òîâà, ò.å. ìîæåø äà íàñòðîèø âñÿêàêâà ñòîéíîñò îò 68 äî ìàêñèìàëíîòî, êîåòî ïîääúðæà èíòåðôåéñà (çà Ethernet - 1500).
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13th February 2009 20:56 #4
Áëàãîäàðÿ çà îòãîâîðèòå!
Windows ïîçâîëÿâà ëè äà ñå óâåëè÷è Receive Window? Àç ãî óâåëè÷èõ íà 131070 áàéòà, âìåñòî äà ñå ðîâè÷êàòå â ðåãèñòðèòå, ìîæå äà ñå ïðîìåíè ñ DR.TCP è TCPOptimizer, íî íà ñíèìêàòà ñå âèæäà, ÷å â ïàêåòèòå çà ïîòâúðæäåíèå å çàäàäåíî 65535 çà Receive Window
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14th February 2009 14:40 #5Çà äà ïîçâîëèø ïî-ãîëÿì ïðîçîðåö îò 64Ê òðÿáâà äà èçïîëçâàø îïöèÿòà Window Scale, îïèñàíà â RFC 1323. Òîâà ïîä Windows ñå ðàçðåøàâà ñ êëþ÷à â registry Tcp1323Opts=1.The TCP/IP standard allows for a receive window up to 65,535 octets in size, which is the maximum value that can be specified in the 16-bit TCP window size field.
Ïîäðîáíîñòè òóê.
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14th February 2009 23:35 #6
delian, æèâ è çäðàâ.
http://www.prikachi.com/images.php?files/601350n.jpg




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