How to tweak your MTU
and double your connection throughput?
How to double or triple
Maximum Transmission Unit MTU is the default packet Windows uses to negotiate when a connection is opened
between two computers, they must agree on an MTU by comparing MTU and selecting the smaller of the two.
How does it work?
This fragmentation can double the amount of time it takes to send a single packet. Windows has a built-in MTU Discovery that will adjust for this by sending out a packet that is marked as "Not Fragment".
Then the router sends back an error to the computer saying that the packet was too large, then Windows lowers the MTU until there are no more errors.
Most ISP uses an MTU of 576, then every time you start a connection, Windows must adjust down to this value. Even though Windows automatically adjusts the packet size, it still takes time to negotiate an acceptable MTU.
By setting this value manually, (see below MaxMTU setting) you greatly reduce the amount of work that Windows must do to negotiate with the ISP
Data shoots across the Internet and into your computer in "packets"--see bits.bytes for more info. These packets are sized for optimal transfer speed over the Internet back bone, routers and ethernet networks etc.
If you are connected
through a modem and an ISP (Internet Service Provider), the default packet
size is could be less than optimal. The result is a substantial performance
degradation because the packets are fragmented and need to be re-assembled.
How to tweak your MTU
1. Click START
3. Type this in the run box REGEDIT
5. Click and highlight HKEY_LOCAL_MACHINE
7. Click on MaxMTU to highlight it and right click to MODIFY, change data to 576 and close the registry, reboot the system and get ready to surf.
Other connection device that may require different MTU value? See bottom of page: Setting info for various connection device
How to double or triple your Internet throughput? Dial-up modem, Network, Cable, DSL, ISDN, whatever...
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If you are confused or can't find MaxMTU
1. PPP-Boost MTU freeware--(for Win
2. TweakDUN shareware www.pattersondesigns.com/tweakdun
3. MTU setting shareware
TTL (Time To Live)
RWIN (TCP Receive Window)
MSS (Maximum Segment Size) is the largest segment of TCP data that Winsock is prepared to receive on a particular connection. When the TCP connection is initially established, both uses the minimum of each other's MSS value.
If the MSS is too low, the data/header ratio will be low. If the MSS is too high, will lead to large IP datagram and the packets will tend to fragment in transit where other networks may be having smaller MTU. Hence, performance can be increase by reducing MSS value.
Since packet headers are normally 40 bytes in length, your MSS value should always be set to MTUvalue minus 40 (i.e. if your MTU is 1500 the set MSS to 1460) at least 40 less than the value of the MTU.
Setting info for using various connection device
Using General Connection
Using Dial-up Modem Connections
Using Cable Modem or LAN Connections
Windows 95/98/ME, using Cable Modem or DSL/ADSL
Windows 2000 using Cable Modem or DSL/ADSL
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