[Rails] how to create virtual domain name for RoR application?

Hi,

I have a application for our internal office use. Platform is Ubuntu
9.04 sever edition. with Ruby version 1.8.7 (i486-linux)
RubyGems version 1.3.7
Rack version 1.0
Rails version 2.3.5
Active Record version 2.3.5
Active Resource version 2.3.5
Action Mailer version 2.3.5
Active Support version 2.3.5
Application root /home/infinity1/OBS
Environment development
Database adapter mysql
Database schema version 0

Now suppose my IP(local) number is 192.168.0.3. how can I create a
virtual name for the application ? so that I can use www.example.com
rather http://192.168.03:3000/login_c.

Please help me regarding this. Thanks in advance.

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