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Old 04-16-2006, 11:40 PM   #1
RajRed
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shell command to find the number of collisions of NICs


which linux command gives the number of collisions of NICs? I tried 'netstat -i' in the Redhat and did not seem to have the collision info?
Thanks.
 
Old 04-17-2006, 02:26 AM   #2
acid_kewpie
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tis listed in the output of ifconfig i believe.
 
Old 04-17-2006, 04:33 AM   #3
coolb
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Quote:
Originally Posted by RajRed
which linux command gives the number of collisions of NICs? I tried 'netstat -i' in the Redhat and did not seem to have the collision info?
Thanks.
hardware is better for this kind of job :-)

eg. switch or router with leds...
 
Old 04-17-2006, 04:43 AM   #4
acid_kewpie
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yeah, i just love sitting in front of a switch and counting every time the collision light flicks on and off every 100th of a second!
 
Old 04-17-2006, 10:27 AM   #5
archtoad6
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Would any/all of the following do what you want?
Code:
ifconfig  | grep collisions:
ifconfig  | grep packets:
ifconfig  | grep 'collisions:\|packets:'
Or, if you are sure that the interface you are interested in (eth0?) is 1st:
Code:
ifconfig  | grep collisions:              | head -1
ifconfig  | grep packets:                 | head -2
ifconfig  | grep 'collisions:\|packets:'  | head -3
 
Old 04-17-2006, 10:32 AM   #6
acid_kewpie
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well seeing as "ifconfig eth0" shows eth0 only, a head on the output is not needed.
 
Old 04-17-2006, 08:04 PM   #7
RajRed
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But, I need to know the total number of collisions of all the NICs. Can it be done in the command line or it needs the script to do it?
 
Old 04-18-2006, 05:14 AM   #8
archtoad6
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Quote:
Originally Posted by acid_kewpie
well seeing as "ifconfig eth0" shows eth0 only, a head on the output is not needed.
Oops, my bad. thanks for the reminder, I get so used to using
ifconfig on the CLI w/ tab completion (ifc<tab>) that I forget that it takes arguments.
Code:
ifconfig eth0  | grep collisions:
ifconfig eth0  | grep packets:
ifconfig eth0  | grep 'collisions:\|packets:'
Much better.


Quote:
Originally Posted by RajRed
But, I need to know the total number of collisions of all the NICs. ...
How many NIC's do you have?

Quote:
Originally Posted by RajRed
... Can it be done in the command line or it needs the script to do it?
Do you have a preference? Theoretically, anything you can do in a script, can do on the CLI. It's just not convenient.

Are you looking for a command/script that will take a list interfaces (NIC's), find their collision counts, add up those counts, & output that sum? And do you want verbiage, like "Total collisions for interfaces eth0 & eth1 = nnn"?
 
Old 04-18-2006, 09:22 AM   #9
RajRed
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yes, I need to just print the total number of collision of all NICs. The number of NICs should be another variable too.

Thanks.
 
Old 04-18-2006, 01:42 PM   #10
archtoad6
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Good. Unless the NIC's are consecutively #'d, you will need to supply a list of their names rather than a count; the list could be permanent. Perhaps a little more background on what you will be doing, especially how it might change from 1 use to the next.

Now for the big Q: how good are you at bash scripting & how much help do need in writing it?
 
Old 04-18-2006, 03:08 PM   #11
marozsas
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You don't mention which RedHat are you using, but the code bellow is good for FC5. I think it will work in any kernel 2.6, because it depends on /sys interface only.

Code:
for device in $(\ls /sys/class/net); do 
   echo -n "${device}: "; 
   cat /sys/class/net/${device}/statistics/collisions; 
   echo; 
done

Last edited by marozsas; 04-18-2006 at 03:10 PM.
 
Old 04-18-2006, 04:39 PM   #12
RajRed
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I think I understand the logic here, it still list the collision for each nic, how do I get the sum of all the collisions?

Thanks.
 
Old 04-19-2006, 07:13 AM   #13
marozsas
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Just put the intermediate collision info in a variable and add it to a total count variable. At the end, print the total.

Take a look at this great bash tutorial. It has all stuff you need to learn to mastering shell script: http://www.tldp.org/LDP/abs/html/

enjoy,

Code:
for device in $(\ls /sys/class/net); do
     echo -n "${device}: ";  
     col=$(cat /sys/class/net/${device}/statistics/collisions); 
     sum=$(($sum+$col)); 
     echo $col;   
done
echo "sum: $sum"
 
Old 04-19-2006, 12:24 PM   #14
archtoad6
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Using /sys/class/net/${device}/statistics/collisions is a vast improvement over my technique. Tip of the hat to marozsas.

You can still change the source of the iterated values for ${device} from $(\ls /sys/class/net), which will list all interfaces, to a list of the NIC's only -- if you want to.

You could also pipe the output through awk to format it in columns. Depends on how pretty you want it.
 
Old 04-19-2006, 02:20 PM   #15
RajRed
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Thank you for your suggestions.
 
  


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