piranha
10-03-01, 10:02 AM
I try to help somebody to tweak 56K connection but tcp/ip always reports 1500 mtu (instead of 576).
Is it true that W2K adjust itself to the good mtu ? In this case why tcp/ip test always reported 1500 !!!
In Lobo help page, I found a link for W2000 registry. If we set the mtu at 576 in the key below will it be ok ?
MTU
Key: Adapter Name \Parameters\Tcpip
NOTE : In Windows 2000 this value is under the following key:
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 will transmit over the underlying network. The size includes the transport header. Note that an IP datagram may span multiple packets. Values larger than the default for the underlying network will result in the transport using the network default MTU. Values smaller than 68 will result in the tranport using an MTU of 68.
Is it true that W2K adjust itself to the good mtu ? In this case why tcp/ip test always reported 1500 !!!
In Lobo help page, I found a link for W2000 registry. If we set the mtu at 576 in the key below will it be ok ?
MTU
Key: Adapter Name \Parameters\Tcpip
NOTE : In Windows 2000 this value is under the following key:
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 will transmit over the underlying network. The size includes the transport header. Note that an IP datagram may span multiple packets. Values larger than the default for the underlying network will result in the transport using the network default MTU. Values smaller than 68 will result in the tranport using an MTU of 68.