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  1. #1
    Registered User nikikom's Avatar
    Join Date: Jan:2009
    Location: Áúëãàðèÿ
    Posts: 31

    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:
    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.
    http://support.microsoft.com/kb/314053/
    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.

  2. #2
    Developer IceLed's Avatar
    Join Date: May:2005
    Location: Sofia
    Posts: 163
    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

  3. #3
    Wall-e delian's Avatar
    Join Date: May:2003
    Location: ::1
    Posts: 4,723
    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).

  4. #4
    Registered User nikikom's Avatar
    Join Date: Jan:2009
    Location: Áúëãàðèÿ
    Posts: 31
    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 .


  5. #5
    Wall-e delian's Avatar
    Join Date: May:2003
    Location: ::1
    Posts: 4,723
    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.
    Çà 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.

    Ïîäðîáíîñòè òóê.

  6. #6
    Registered User nikikom's Avatar
    Join Date: Jan:2009
    Location: Áúëãàðèÿ
    Posts: 31

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