CLI Reference Guide

2-35
NET.CFG Options Reference
Link Driver Option
If you are running MS Windows in enhanced mode, the VIPX.386 device
driver requires the maximum frame size to be less than 8000 bytes. If the
frame size exceeds 8000 bytes, network communication fails.
MEM [#1 | #2] hex_starting_address [hex_length]
Specifies a memory range to be used by the network board.
Syntax max frame size number
If the line speed is 16 Mbps, the value for number
must be between 638 and 17,954. If the line speed is 4
Mbps, the value must be between 638 and 4464.
The value must include the number of bytes for the
data packet (usually 1, 2, 4, or 8KB), and for the
largest possible header (currently, 52 bytes LAN
header + 74 bytes protocol header = 126 bytes).
For example, to use 2KB data packets, you would
calculate the value for number as
2048 + 52 + 74 = 2174
Default The NTR2000.COM driver’s default size is 4222 bytes. But if
your network board has 8 KB of shared RAM available, the
default size is 2174 bytes.
The LANSUP.COM driver’s default is 1150 bytes. But
if you’re using the IBM LAN Support Program with
an Ethernet network board driver, the maximum size
is 1496 bytes.
Example To specify the maximum frame size of an NTR2000 LAN
driver, you would place the following line in your NET.CFG
file:
link driver ntr2000
max frame size 2174
Syntax
mem [#1 | #2] hex_starting_address [hex_length]