# File lib/fog/compute/openstack/requests/create_security_group_rule.rb, line 5
        def create_security_group_rule(parent_group_id, ip_protocol, from_port, to_port, cidr, group_id = nil)
          data = {
            'security_group_rule' => {
              'parent_group_id' => parent_group_id,
              'ip_protocol'     => ip_protocol,
              'from_port'       => from_port,
              'to_port'         => to_port,
              'cidr'            => cidr,
              'group_id'        => group_id
            }
          }

          request(
            :expects => 200,
            :method  => 'POST',
            :body    => Fog::JSON.encode(data),
            :path    => 'os-security-group-rules'
          )
        end