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-   -   how big is my NIC? (https://www.linuxquestions.org/questions/linux-networking-3/how-big-is-my-nic-932303/)

bigearsbilly 03-02-2012 03:42 AM
how big is my NIC?
 
I am no sysadmin but have inherited a back end.

Is there a way from the command line to figure out
what spec NIC I have, like is it 10Mb 100Mb etc?

acid_kewpie 03-02-2012 04:00 AM
ethtool would be my first port of call. ifconfig should show you this too in less detail

zhjim 03-02-2012 04:04 AM
Code:
dmesg | grep eth
Code:
lspci | grep Ether

bigearsbilly 03-02-2012 04:18 AM
Quote:
Originally Posted by acid_kewpie (Post 4616683)
ethtool would be my first port of call. ifconfig should show you this too in less detail
well, these are knackered old servers with 2.4 kernels!
installing stuff is a headache.

---------- Post added 03-02-12 at 10:18 AM ----------

Quote:
Originally Posted by zhjim (Post 4616688)
Code:
dmesg | grep eth
Code:
lspci | grep Ether
cheers, that'll do!

acid_kewpie 03-02-2012 04:24 AM
Remember not to mix what the nic reports as vs what it's actually running as.

bigearsbilly 03-02-2012 09:49 AM
Quote:
Originally Posted by acid_kewpie (Post 4616695)
Remember not to mix what the nic reports as vs what it's actually running as.
oh that's right confuse me why don't ya!

zhjim 03-05-2012 03:03 AM
Especially without giving ways to see the used speed.

acid_kewpie 03-05-2012 03:23 AM
Quote:
Originally Posted by zhjim (Post 4618706)
Especially without giving ways to see the used speed.
Hang on... let me just get my handbag...


I already advised using ethtool in my first reply.

zhjim 03-05-2012 04:51 AM
Just poking you... some more

As the op said that he does not have ethool I looked for the infos that ethtool prints out under /proc but could not find a file that holds the information and so was hopping that you'll might know.

bigearsbilly 03-05-2012 09:34 AM
hey guys, I found this great app called ethtool

;-)

As an explanation, I'm trying to find why a machine is slow.
I know collisions are "normal" in ethernet, but I have none logged at all:

Code:
$ ethtool -S eth0
    tx_collisions: 0
    tx_single_collisions: 0
    tx_mult_collisions: 0
    tx_excessive_collisions: 0
    tx_late_collisions: 0
So I take it to mean that the network is not under any strain at all.
Which probably means the bottleneck is not in the network or NIC.
Which is what I suspect anyway.

acid_kewpie 03-05-2012 09:37 AM
Well in terms of network hardware, the biggest reason for things being slow is duplex mismatch on a given connection, so make sure they are the same at both ends.

bigearsbilly 03-05-2012 05:17 PM
Quote:
Originally Posted by acid_kewpie (Post 4618965)
Well in terms of network hardware, the biggest reason for things being slow is duplex mismatch on a given connection, so make sure they are the same at both ends.
oh crikey!

I never wanted to be a sysadmin.
(well I did but I've changed my mind now)


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