Excessive system usage problem -

[Sam Varshavchik]

Bob Goodwin writes:

>
>         I have a home LAN and limited internet access. If I exceed the
>         usage specified in my subscription my data rates are slowed.
>
>         There are a dozen devices that can connect to the internet and
>         five or six people using them. yesterday someone left something
>         running and by the time I realized the problem we had used more
>         than a gigabyte which doesn't sound like much if you have
>         unlimited usage but we only get 17 gigs per month.
>
>         I shut down the other computers but never identified which one
>         had been causing the problem.
>
>         Can someone suggest a way of measuring usage per device,
>         identifying them by address, MAC, or uuid? I really need to know
>         which one is the offender to control the problem.

Running "ifconfig" shows the number of packets sent and received by each  
network interface. That's a rough metric, and, of course, as soon as the  
network interface goes down, the counters get cleared. But if all your  
machines are directly connected and have their own public IPs, that's the  
only metric you have, unless they're connected through a router and the  
router has an admin interface that keeps track of traffic by IP address.

If you have a single machine with a public IP, and all the other devices are  
NATed through, I believe that iptables can keep track of IP traffic, time to  
RTFM.


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