Tools to monitor a small network

Hi there,
We have a small network,  the Internet speed changing over the time and It get very slow sometimes. When it gets very slow I basically need to know whose problem is it; is it the ISP problem or something locally generate too much of traffic and slow done the Internet,
The network is include 10 windows/Linux computers and a Cisco ASA 5505 firewall, and I prefer a free, simple program that run on windows,
Thank you in advanced -  
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glenthorneConnect With a Mentor Commented:
Have you looked at MRTG? 

If will give you a simple way to monitor traffic on the interface cards on your router.  You can also have it monitor traffic on any SNMP capable machine (like your windows and linux machines).
KETTANEHConnect With a Mentor Commented:
one of the best monitoring tools and it's suitable for you

just try and i guarantee you will like ^_^ (open source)
esasanAuthor Commented:
I used WFilter Enterprise, the problem is, all these monitoring programs just monitor you unless the network traffic comming through the computer that the software is installed. so I ended up configuring a port mirror on my firewall and connect my computer to mirrored port then I could check the network trafic. another thing to remember that WFilter Enterprise is not free, I guess after setting up the port mirror I can find other free software that do the job.  
OSSIM tool has a sniffer called SNORT .. it's open source and really good for following the traffic in ur network
i will try to check ur tool "WFilter Enterprise"

For all round solution use CACTI. open source lots of Fun

Monitoring bandwidth, interfaces Ethernet,V.35 and System ports

Routers health and all round monitoring

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