Current Network Interface Speed

[Michael42]

Hello,

I am trying to determine the current network interface speed (10 or 100 mhz etc.) of a system.

In researching this before posting it seems I should use ifconfig -a to get the the interface name (eri) then ndd /dev/eri \? to determine the speed.

I did this but am not sure how to interpret the ndd output (below).
transceiver_inuse (read only)
link_status (read only)
link_speed (read only)
link_mode (read only)
ipg1 (read and write)
ipg2 (read and write)
use_int_xcvr (read and write)
pace_size (read and write)
adv_autoneg_cap (read and write)
adv_100T4_cap (read and write)
adv_100fdx_cap (read and write)
adv_100hdx_cap (read and write)
adv_10fdx_cap (read and write)
adv_10hdx_cap (read and write)
autoneg_cap (read only)
100T4_cap (read only)
100fdx_cap (read only)
100hdx_cap (read only)
10fdx_cap (read only)
10hdx_cap (read only)
lp_autoneg_cap (read only)
lp_100T4_cap (read only)
lp_100fdx_cap (read only)
lp_100hdx_cap (read only)
lp_10fdx_cap (read only)
lp_10hdx_cap (read only)
instance (read and write)
lance_mode (read and write)
ipg0 (read and write)
intr_blank_time (read and write)
intr_blank_packets (read and write)


What can you advise?



Thanks,

Michael42

 

[Annihilannic]

Michael42,

That output gives you a list of the readable parameters from that particular driver.

Now type ndd -get /dev/eri link_speed for example.

I use this script to get all parameters and their values:

[tt]#!/bin/ksh
if [ $# -lt 1 ]
then
echo "usage: nddgetall device [instance]"
else
if [ -c $1 ]
then
if [ $# -eq 2 ]
then
echo "Setting instance to $2"
ndd -set $1 instance $2
fi
for p in `ndd -get $1 \? | awk 'BEGIN {getline}{print $1}'`
do
echo "$p: \c"
ndd -get $1 $p
done
else
echo $1 is not a character special device.
fi
fi[/tt]

Annihilannic.

 

[Annihilannic]

While I'm on the subject. You meant Mbits/s didn't you, not MHz. ;-)

There is another way, because even when you get the results from ndd they are a little cryptic. If you use the undocumented -k switch to netstat and redirect it to a file, then dig through that file until you find the interface you are interested in, it actually lists the interface speed in bits/s.


Annihilannic.

 

[Michael42]

Annihilannic,

>> You meant Mbits/s didn't you, not MHz.
Yes!


Thanks for the detailed and useful reply.



Thanks,

Michael42

 

[mikeclark]

Don't forget to check link_mode as well as the link_speed.
Make sure everything is running at Full Duplex.

 

[tuka]

netstat -k eri0 (this will give you a complete report on this interface)