Question : Please Help me out.

Hi, thank you for looking my post, my english is not that good, but i will try to explain my question clear. I have a Linksys Etherfast Cable/DSL firewall Router(Model: BEFSX41), and I'm connecting internet through that router.  My local ip is 192.168.1.100, and my actual is 68.XX.XX.XX. I did port forwarding to 7000, and my friend can use telnet 68.XX.XX.XX 7000, and it shows my 7000 is actual open, also i can use telnet 192.168.1.100 7000 to access that port, but why i cannot use telnet 68.XX.XX.XX 7000?  how i can use my actual ip to access that port ? I hope you can understand my question. Thanks again.

Answer : Please Help me out.

There is nothing wrong with you or your setup.  However, you will not be able to access your machine from another machine on the same LAN using the public IP.  Here's a basic reason why:  your ISP will not send packets coming into a router out the same interface (back to you).  Instead, it will be dropped.  Therefore, without your ISP sending those packets back,  you can't reach "yourself" using the public IP from inside the LAN.