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identifying network slowness

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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tolinrome
Asked:
tolinrome
3 Solutions
 
Skyler KincaidNetwork/Systems EngineerCommented:
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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tolinromeAuthor Commented:
2900 series switches, asa 5505
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pgm554Commented:
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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Fred MarshallPrincipalCommented:
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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AkinsdNetwork AdministratorCommented:
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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Dirk MareSystems Engineer (Acting IT Manager)Commented:
+1 for the Dude
Very nice software once get passed the network mapping (graph)
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