When the size of the site reaches a certain level, the business will often split, deployed to different sites ,, one server and a domain name (top level domain) can only bind a site (central station), this time through to the top create a domain subdomain way (in theory, a top-level domain can bind 50 sub-domain), the sub-domain binding to related business sites. by modifying the host file in a way that will resolve all of the domain name to the current server IP, re-analyzing the traffic to the site through the IIS host header (subdomain), the procedure as shown below:
1) site configuration, when the bound set
2) hosts file as follows: Note: hosts file in C: \ Windows \ System32 \ drivers \ etc under
Establishing correspondence between the sub-domain and ip (same ip, different sub-domain) in the hosts file
192.168.0.121 child1.a.com 192.168.0.121 child2.a.com