How to monitor clients IP in network

Hi,
Can you help me please is it possible in java to monitor the client's ip Address in local network? example in local network
i have 20 pcs connected if ever one of this is disconnected from the network this will display to the server that i.p address 192.168.15.15 is disconnected...i have already made the program that will add,update,delete and i am using MSAccess only...the only problem i get is i don't know how to monitor the ip address.can you help me please,...i will be thankful if you will help me..
Best Regards,
Jemz

Have a look at this:
http://download.oracle.com/javase/7/docs/api/java/net/InetAddress.html#isReachable(int)
bye
TPD

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