I'd recommend you use DNS to provide the mapping of host name to IP address (you could use WINS, host or lmhost files but the latter are hard to manage, and the former is going obsolete and is really a Windows only solution). If this is a Linux system it may well already have a DNS host record mapping and therefore already have a DNS address. If this is not 'helpdesk', you will have to create a new A host record that maps helpdesk to 192.168.2.11 in the DNS system.
With DNS, the name will not just be the host name, but rather the fully qualified domain name. So if your internal domain is company.local, you would access the server via
http://helpdesk.company.local
That will get you to the server. The next step is to ensure that requests to the root get forwarded to the glpi location. Two ways to do that. Either within the web server software (if apache you can use forwarding directives to do this), or via a dummy redirect html page. That is simply a page called index.html that sits in the web root and uses a redirect meta tag to forward users to the correct location:
http://www.google.com/search?q=meta+tag+redirect
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