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identifying network slowness

Posted on 2013-11-07
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Last Modified: 2016-10-28
Is there a tool (free) that can help identify causes of network slowness, where we can analyze traffic and see maybe if there are anything rouge on the network or certain user perhaps downloading too much etc?
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Question by:tolinrome
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6 Comments
 
LVL 15

Expert Comment

by:Skyler Kincaid
ID: 39632633
What kind of router/firewall do you have? This is going to be the best place to start depending on the model you have.

Most firewalls have ways that you can track the usage and check the logs.
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Author Comment

by:tolinrome
ID: 39632637
2900 series switches, asa 5505
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Assisted Solution

by:pgm554
pgm554 earned 167 total points
ID: 39632710
What's slow?
Internet?'
Apps?
File transfers?

Wireshark can help,but it's not all that easy to use.

The 2900's should have log files that you can look at for errors.
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Accepted Solution

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Fred Marshall earned 167 total points
ID: 39633983
Start with the free verson of Paessler's PRTG.
Set up SNMP on your workstation / PRTG.
Set up SNMP on those network switches and router.
Now you can see the traffic on all the ports and much more likely assess where the traffic may be high, if there are errors, where the traffic is coming from and going.
Also figure to use Wireshark on a mirrored port (which will require a cable at the port connecting to the monitoring workstation).  A laptop may be handy for this or a dedicated cable and NIC.  The workstation NIC connected to a mirror port doesn't have to have an IP address at all.  USB/Ethernet adapters are handy for adding NICs for this purpose.
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LVL 18

Assisted Solution

by:Akinsd
Akinsd earned 166 total points
ID: 39635042
PTRG and OPManager are free for up to 10 devices

Try the Dude by Mikrotik
www.mikrotik.com/thedude
100% free
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LVL 16

Expert Comment

by:Dirk Mare
ID: 39640163
+1 for the Dude
Very nice software once get passed the network mapping (graph)
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