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I believe you are looking for dynamic DNS (DDNS):<br />
<a href="http://en.wikipedia.org/wiki/Dynamic_DNS" rel="ugc">http://en.wikipedia.org/wiki/Dynamic_DNS</a><br />
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One manual for instalation on linux:<br />
<a href="http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch19_:_Dynamic_DNS" rel="ugc">http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch19_:_Dynamic_DNS</a>
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I believe you are looking for dynamic DNS (DDNS):
http://en.wikipedia.org/wiki/Dynamic_DNS [http://en.wikipedia.org/wiki/Dynamic_DNS]

One manual for instalation on linux:
http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch19_:_Dynamic_DNS [http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch19_:_Dynamic_DNS]

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my homepc is a dialup connection with fedora 8.<br />
with dialup connection ip address is changing dynamically , i need to communicate with the <br />
hostname to my homepc even if the ip address is changed dynamically, i need to contact from some other geographic location to my home pc. &nbsp; 
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my homepc is a dialup connection with fedora 8.
with dialup connection ip address is changing dynamically , i need to communicate with the 
hostname to my homepc even if the ip address is changed dynamically, i need to contact from some other geographic location to my home pc.   

DNS Server for PPP Dialup connections

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

The variety of Linux distributions creates myriad issues relating to configuration and operations when computers are networked, not the least of which is the use of various network management applications, some of which are included with specific distributions, while others are standalone applications.