network monitoring

i have a small 4-computer LAN with a DSL router.

i'd like to know which computers are using how much traffic, so i can make sure that no one's being excessive and chewing up all of the traffic allocation for the month.

anyone know of any free software to use? linux preferably, but windows would be ok too.

I'm also interested thanks.

Windows based prefereably. Windows XP.

Need it to monitor the access point.

Try wingate (win32) or squid (linux or win32)

then give each user a u&p (or assign the computers a fix ip either on the computer or in the settings on the router by thier mac address) then change the dhcp settings to not be the router - set them to the proxy host computer.

its not really perfect unless you have a configurable firewall/ /proxy between the comps and the adsl router as people can work thier way around it if they try. But that involves a new comp altho it can be very low spec.

nah i don't want to add the extra complexity of a proxy server to things.

can't i do something with SNMP?

Im sure you could but its beyond my experience.

1. Id be surprised if your DSL router has SNMP at all.
2. That it could do per IP/user accounting

In fact i'd put $10 on it not having it...

If it does... http://www.paessler.com/index_eng.html

There's a free one for single snmp feed

My old RTA020 had SNMP so don't be too surprised if it does have it, even if it's not in the specifications or the manual