maybe snort can help u.
www.snort.org
u can get rpms from
http://dag.wieers.com/packages/snort/
snort creates logs but i dont know how to see that logs from xp workstation. u can ssh to linux and check it yourself. or u can write a simple shell script to send the logs to your email account. maybe it is possible to configure snort to alert u.
if u search about snort at
www.sourceforge.net u will probably find lots of monitoring tools for snort.
i dont know enough about snort, so i cant help u much.
good luck.