Several ways to eliminate unwanted traffic on your network:
If users are not on limited accounts already, put them there immediately.

1) Whilst logged in as admin, configure IPSec policies for each PC that
allow the user to communicate only within the network and/or specified
external mail servers, etc, if needed. Type "secpol.msc" (without quotes) in
the Run field to get started. There is a wealth of information on how to
configure IPSec effectively on the internet. Ironically, a lot of those
tutorials are on YouTube. :P
2) Also, you can take advantage of the seldom-used TCP/IP filtering
component of the PC's network adapter settings. TCP/IP filtering rules are
very effective at eliminating unwanted traffic because they work at the
kernel level. Use sparingly unless you are familiar with this security
feature. It's quite easy to hobble your network with generic filtering
rules.
3) Last, but not least, terminate anyone who repeatedly violates your
company's usage policies.


On 10/05/2011 12:51 AM, Tua Loh Au wrote:
Hello all !

There are around 30 PCs in the office connected by wired network, plus
untold number of notebooks or other portable devices connected via
WIFI.

The PCs are running XP and Win7.

The number 1 problem that I am facing is the udp traffics. They are
taking a big chunk out of the available bandwidth.




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