Unexpected background data traffic?

Hi,
Just successfully connected and started using BT Broadband today via a Dell Studio 1749 and BT Home Hub3A.
However, when I connect a Dell Dimension 2400 desktop via an ethernet cable, after an expected initial burst of internet traffic, it settles down to a steady 10 KiB/s (approx.) of internet traffic both in the upload and download directions! I use a simple monitor utility of internet traffic called 'Netmeter' to view the activity.
The O/S on the Dimension is 'XP' with SP3 and has the latest Windows updates loaded. There are many applications loaded on the p.c., but using 'Task Manager' I cannot find any obvious rogue programmes or processes running that are the likely cause of the traffic! 'Norton Internet Security V18.6.0.29' is the anti-virus programme. My previous 'ISP' was 'O2' with a Thomson router, and there was no such activity when using that!
With 'BT Broadband Option 1' I'm obviously concerned that my 10GB download limit is being eaten into at a startling rate if I leave my 'Local Area Connection' enabled.
Not a lot to go on I appreciate, but does anyone have any ideas as to what might be causing the traffic, or how I can drill down deeper to find where the traffic is originating? Bit strange with similar levels of traffic being generated in both directions, almost as if some kind of 'loopback' on the network card is in operation.
I would add that when I use a 'dongle' from Orange, there is no such problem! I have an old Netgear wireless adapter which I've yet to plug into a USB port and see if that behaves in the same manner.
Thanks

Ectophile wrote:
It's not easy to see what programs are transmitting data. It could be almost anything trying to do an auto-update.
If all else fails, then there are tools such as Wireshark (http://www.wireshark.org/) which will look at the individual packets going back and forth. But unless you're conversant with the details of Internet protocol, that can be a bit daunting.
Agreed. Ah..Wireshark, that brings back memories....I remember using that in the dim and distant past. Thanks for the reminder. Know what you mean about Internet protocols, but I should really have a good idea as for my sins I was in the Datacomms business up until I retired a few years back....but I'm a little rusty these days
I know I've made no changes to the desktop since having changed ISPs, the only difference is connecting to a different router, so it leads me to thinking it's more to do with interaction with the Home Hub compared with the Thomson router!
I don't believe it's an application running an auto update as the traffic flow is almost equal in both directions and not at a high rate. Were it an update, I'd expect high data rate in the receive direction and the occasional ack/nak in the transmit path!
When I get some time, think I'll dig out Wireshark and see what it comes up with...thanks.

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