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network tunnin with NT4.0

Posted on 1997-05-15
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I search how a can modify network's performance with NT 4.0
I'd like to change the TCP-IP MTU and some others parameters. Is there a tool available for that?

The best for me, is the equivalente of Unix's tools like
nettune, landiag, ...
Thanks for response
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Question by:bibi051597
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by:bibi051597
ID: 1560256
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Read:

http://www.microsoft.com/syspro/technet/boes/bo/winntas/technote/nt301a.htm

To alter values you must use REGEDT32

Registry path:

HKEY_LOCAL_MACHINE\System
      \CurrentControlSet
            \Services
                  \adapter name#
                        \Parameters
                              \Tcpip

MaxForwardPending     REG_DWORD

Range: Packets (1 – 0xFFFFFFFF)

Default: 20

Establishes the maximum number of packets that the IP forwarding engine will submit for transmission to a specific network interface at one time. Additional packets are queued in IP until outstanding transmissions on the interface are complete. The default value for this entry is usually sufficient because most network adapters transmit packets very quickly. However, a single RAS interface might multiplex many slow serial lines. Entering a larger value might improve the performance of the RAS interface. The optimal value depends on the number and characteristics of outgoing lines.

MTU     REG_DWORD

Range: 68 – MTU of the underlying network bytes

Default: 0xFFFFFFFF

Establishes the 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 packet size includes the size of the transport header. An IP datagram can span multiple packets.)
Each interface used by TCP/IP can have a different MTU value. The MTU is usually determined through negotiation with the lower driver, using that lower driver's value. The value of this entry overrides the default MTU for the network interface. If the value of this entry is greater than the default value of the underlying network, the transport will use the network default MTU. If the value of this entry is less than 68, a value of 68 will be used as the MTU.

Ideally, the MTU should be large enough to hold any datagram in one frame. The limiting factor is usually the technology making the transfer. Some technologies limit the maximum size to as little as 128; Ethernet limits transfers to 1500; and proNet-10 allows as many as 2044 octets per frame.
Datagrams larger than the MTU value are automatically divided into smaller pieces called fragments; size is a multiple of eight octets. Fragmentation usually occurs somewhere through which the traffic must pass whose MTU is smaller than the encapsulated datagram. If fragmentation occurs, the fragments travel separately to the destination computer, where they are automatically reassembled before the datagram is processed.

Note: By default, Windows NT TCP/IP uses PMTU detection, that is, it requests the locally supported MTU from the NIC driver. Therefore, it is generally not necessary to change this value, and changing it might degrade performance.



Best is to look in the server resourcekit. There is a help file explaining all registry entries. A lot is also under:

HKEY_LOCAL_MACHINE\System
      \CurrentControlSet
            \Services
                  \Tcpip
                        \Parameters

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