TITLE    : How do I change the speed of a network adapter?
OS LEVEL : Solaris
DATE     : 13/02/01
VERSION  : 1.0
AUTHOR   : Hubertus A. Haniel (hubba@unixcook.com)

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There are two ways:

add the following entries to /etc/system:

* Set all hme interfaces to 100MB full duplex
set hme:hme_adv_autoneg_cap=0
set hme:hme_adv_100T4_cap=0
set hme:hme_adv_100fdx_cap=1
set hme:hme_adv_100hdx_cap=0
set hme:hme_adv_10fdx_cap=0
set hme:hme_adv_10hdx_cap=0
* End hme interfaces

The above example will force all adapters on to 100mb full duplex

The other way is as follows:

Use the ndd command:

ndd /dev/hme instance
	Returns the currently selected adapter 0=hme0 1=hme1 2=hme2 etc
ndd /dev/hme link_mode
	Returns the duplex 1=full 0=half
ndd /dev/hme link_speed
	Returns the speed 1=100 0=half
ndd /dev/hme link_status
	Returns the status of the link 1=up 0=down

To set the options you will use the -set option

The following script is an example of setting one adapter to 100mb and the 
other one to 10mb:

ndd -set /dev/hme instance 0
ndd -set /dev/hme adv_100T4_cap 0
ndd -set /dev/hme adv_100fdx_cap 1
ndd -set /dev/hme adv_100hdx_cap 0
ndd -set /dev/hme adv_10fdx_cap 0
ndd -set /dev/hme adv_10hdx_cap 0
ndd -set /dev/hme adv_autoneg_cap 0

ndd -set /dev/hme instance 2
ndd -set /dev/hme adv_100T4_cap 0
ndd -set /dev/hme adv_100fdx_cap 0
ndd -set /dev/hme adv_100hdx_cap 0
ndd -set /dev/hme adv_10fdx_cap 0
ndd -set /dev/hme adv_10hdx_cap 1

The above will set /dev/hme0 to 100mb and /dev/hme2 to 10mb half duplex
for more information try "man ndd"