Why has my Broadband usage gone so high.

Hi Folks

Since rebuilding our SBS 2000 server a couple of weeks ago our Internet usage has more than doubled.  This is freaking me out as I have tried everything I can over the last 3 days now I'm in to the weekend and still no further clues!

Are there any tools I can use to see what is responsible for this traffic / usage?

In a nutshell: -

Netgear FVS328 Firewall/VPN Router
Windows SBS 2000 server
Windows XP Pro PC's

There are no P2P file sharing apps running
Have scanned for all viruses (such as Sober.I mass mailer)
Have turned of Automatic Updates
Have changed password on ISP account to ensure no one has cracked the original
Have enabled logging on firewall but cant seen anything obvious

ALL comments warmly welcomed, I am already bald but I am starting to feel like I may loose my hair again... if that is spossible.


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Hi vicktheviking,
I suggest you get a PC and install Ethereal on it (http://www.ethereal.com). Also get a hub and connect the pc, the Netgear and the link to your internal network to it. That way all traffic to and from the Linksys goes to the hub and gets seen by Ethereal aswell.
Ethereal is a network analyser and will show you what type of traffic is the most popular and which machines are sending it.
For a complete look at what is going on the server, network and such, try AATools


Ethereal is great to see what is on the network via packet sniffer, but you need to see what process, .dll, .exe and ports are being used on your server as well.

If you want a more GUI based system other than Ethereal, try www.colasoft.com


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vickthevikingAuthor Commented:
Okay thanks guys.  I will try your suggestions on Monday as soon as I can get access to the LAN and let you know.

vickthevikingAuthor Commented:
I found the GUI tool from Colasoft easy to use and the demo version gave me just about enough time and info to see that my server was sending out loads of SMTP packet to our ISP's mail server.

Now all I gotta do I work out why the SMTP traffic...... but that's another storey.

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