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MTU (Maximum Transmission Unit): |
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This is the default packet size that Windows uses to negotiate with.
When a connection is opened between two computers, they must agree on an
MTU. It’s done by comparing MTU and selecting the smaller of the two. If the MTU is set too large for routers that are between the computers, these routers then fragment this information into a packet size that the router can handle. This fragmentation can double the amount of time it takes to send a single packet. |
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Windows has a built-in MTU Discovery that will adjust for this by sending out a packet that is marked as "Not Fragmental". Then the router sends back an error to the computer saying that the packet was too large, and Windows then lowers the MTU until there are no more errors. |
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If your 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 it time to negotiate an acceptable
MTU. By setting this value manually, you greatly reduce the amount of work that Windows must
do to negotiate. |
RWIN (Receive Window): |
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This is the default packet size that Windows uses to negotiate with.
When a connection is opened between two computers, they must agree on an
MTU. It’s done by comparing MTU and selecting the smaller of the two. If the MTU is set too large for routers that are between the computers, these routers then fragment this information into a packet size that the router can handle. 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 Fragmental". Then the router sends back an error to the computer saying that the packet was too large, and Windows then lowers the MTU until there are no more errors. |
 |
If your 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 it time to negotiate an acceptable
MTU.
By setting this value manually, you greatly reduce the amount of work that Windows must
do to negotiate. |
TTL (Time To Live): |
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TTL is a field in the IP header which indicates how long a packet should be allowed to survive before it is discarded. This value specifies the maximum number of routers that a packet may be forwarded through on to its destination. TTL essentially determines the maximum number of hops permitted. |
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Windows 95 default is 32, but with the Internet growing larger all the time, we recommend to set it to the larger setting of 128. |