code: func (r Hardware_SecurityModule) GetPrivateVlanByIpAddress(ipAddress *string) (resp datatypes.Network_Vlan, err error) {
  	params := []interface{}{
  		ipAddress,
  	}
  	err = r.Session.DoRequest("SoftLayer_Hardware_SecurityModule", "getPrivateVlanByIpAddress", params, &r.Options, &resp)
  	return
  }
docs: // Retrieve a backend network VLAN by searching for an IP address