If you you receive the following with a Ruby on Rails site: Ruby On Rails Error: Only specific requests are allowed. code ActionController::MethodNotAllowed Only get, head, post, put, and delete requests are allowed. The solution is to kill existing web/app server processes and restart the web/app server. Then, reload the page.
Netmask is another simple tool which does one thing and that is, makes a ICMP netmask request. By determining the netmasks of various computers on a network, you can better map your subnet structure and infer trust relationships.