how does a server gets the IP address of a client

[chaitanya karthikk]

hi everybody, I have a requirement.
how does the server gets the IP address or modem address or the processor number of the client. which method in java is used to get the client's IP address.

my requirement is that, if more than 3 requests come from one client to the serevr, then the sever must not provide any services for that particular client for some time. I want to get rid of denial of service attack. how to do this.

my system configurations:

operating system: windows xp.
java: 1.4
serevr: websphere application server
tool: eclipse

[James Ward]

You can do it this way inside a JSP/Servlet:

request.getRemoteAddr();//this will return IP address

If you are talking of preventing DOS - Denial of Service Attack, there is a good write-up here:
http://qnatech.wordpress.com/2008/11/25/how-to-prevent-dos-denial-of-service-attack/

[chaitanya karthikk]

thank you very much sir. i will definitely try it.

[Cameron Wallace McKenzie]

DOS is a pretty significant topic. I'd suggest two things:

1. Look online for DOS attack solutions that have proven to work. You might save alot of time by leveraging code and techniques by some of the industry experts.

2. If you do invent a great DOS solution, patent it outside of your company and make millions for yourself.

Good luck!

-Cameron McKenzie