Simple registry optimization method greatly improves ADSL work efficiency

When we use a product, we always hope to maximize the effectiveness of the product. We are also mentally surfing the Internet through broadband. How can we make ADSL the fastest and best effect? Under the existing hardware conditions, we can only try our best to optimize! When installing the Windows series, the default setting is for Ethernet. During the TCP/IP packet transmission process, some useless work will be subcontracted and combined to adapt to the ISP. Although ADSL uses PPPoE protocol and has the characteristics of a local area network, it is not completely equal to the local area network protocol, so there is still room for optimization. We can modify the relevant parameters in the registry to make the system optimize for ADSL. Specific parameters include MaxMTU, DefaultRcvWin, etc. This optimization can adapt ADSL to ISP network parameters and maximize ADSL work efficiency.   Open the registry   Registration form MaxMTU is the largest TCP/IP transmission unit. In the TCP/IP protocol, the data to be transmitted is divided into smaller groups for transmission, with the size of each group being 576 bytes. The default bytes for Windows is 1500, which is the Ethernet packet standard. The PPPoE used by ADSL is slightly smaller than this value, and there are slight differences depending on the ISP. Using the default value will reduce the transmission efficiency. The location of MaxMTU in the registry: HKEY_LOCAL_MACHINESystemCurrentControlSetServicesClassNetTrans0yy, Key name: MaxMTU Among them, yy is the entrance to TCP/IP, which varies depending on the settings, generally between 00 and 30. How to determine the MTU value of the ISP and match it to achieve optimization purpose is actually very simple. You can get this value by yourself using the Ping command. ping -f -l 1500 will send data to group by 1500 (-l 1500) (preferably your ISP's website), and check whether the data fragments generated by different packets are found (-f) if they exist, reduce the packet value and finally find a matching MaxMTU. This value is the most critical part of ADSL optimization. DefaultRcvWindow is the default transmission unit buffer size. If the buffer is too small, it will cause packet blocking and reduce transmission efficiency. The buffer is too large, and if an error occurs in a packet, it will cause all partitions in the buffer to be discarded and resented, which will also reduce efficiency. The size of this value is related to the speed of MODEM, preferably an integer multiple of MSS (Maximum Segment Size, maximum number of packets, equal to MxaMTU minus 40 bytes of address information), the location of DefaultRcvWindow in the registry: HKEY_LOCAL_MACHINESystemCurrentControlSetServicesVxDMSTCP Key name: DefaultRcvWindow DefaultTTL is the lifespan of a TCP/IP packet. If the packet is transmitted in INTERNET for more than the lifespan of the packet, the packet will be discarded. Changing DefaultTTL to a larger scale will help the information spread further in INTERNET. DefaultTTL's location in the registry: HKEY_LOCAL_MACHINESystemCurrentControlSetServicesVxDMSTCP, Key name: DefaultTTL The above will introduce these main parameters that need to be optimized, and some other parameters will not be introduced one by one due to limited information.

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