Listen 192.168.20.243:80 
<VirtualHost 192.168.20.243:80> 
        ServerName localhost 
        # ServerAlias 
        # ServerAdmin  
 
        ErrorLog /var/log/apache2/trac_error.log 
        DocumentRoot /var/www/localhost/htdocs/trac 
        ScriptAlias / /var/www/localhost/cgi-bin/trac.cgi 
 
#        <Location "/cgi-bin/trac.cgi"> 
#               SetEnv TRAC_ENV "/var/www/localhost/cgi-bin/trac.cgi" 
#               Order allow,deny 
#               Allow from 192.168.20.251 
#        </Location> 
 
        <Directory "/cgi-bin/trac.cgi"> 
                SetHandler mod_python 
                PythonHandler mod_python.testhandler 
#               PythonHandler trac.web.modpython_frontend  
                PythonOption TracEnv /var/lib/trac/collaboration 
                PythonOption TracUriRoot collaboration 
                Order allow,deny 
                Allow from 192.168.20.253 
        </Directory> 
 
        <Directory "/cgi-bin/trac.cgi/login"> 
                AuthType Basic 
                AuthName "trac" 
                AuthUserFile /etc/apache2/trac.htpasswd 
                Require valid-user 
                Order allow,deny 
                Allow from 192.168.20.253 
 
        </Directory> 
 
</VirtualHost>