When using sniffer, I found most of our IP traffic are
32bytes. Sime of the packet are 64 bytes. It is said that
larger packet will increase transmit performance. How can
I change the packet size?

Hello,

Some NIC cards will allow you to do this via the NIC card properties. If
not then you can change this by the registry. Adding an entry called "MTU"

MTU is the name
Under HKLM\SYSTEM\CCS\Services\TCPIP\Parameters\Interfaces\GUID for
interface\
Value Type: REG_DWORD"number of bytes"

Common sizes include:
Network MTU (bytes)
-----------------------------------
16 Mbps Token Ring 17914
4 Mbps Token Ring 4464
FDDI 4352
Ethernet 1500
IEEE 802.3/802.2 1492
PPPoE (WAN Miniport) 1480
X.25 576

I would first perform a ping with the -f and -l switch to test the maximum
allowed non fragmented packet size and set that value to be the MTU.

ping <computer_name or IP_address> -f -l 1472


Shane Brasher
MCSE (2000,NT),MCSA, A+
Microsoft Platforms Support
Windows NT/2000 Networking