to effect access to an enforcement point of said access network said method comprising informing an authentication client of said mobile node that an authentication agent has completed an installation process with the enforcement point application_number US 62458607 A description while the present invention may be embodied in many different forms a number of illustrative embodiments are described with the understanding that the present disclosure is to be considered as providing examples of the principles of the various inventions described herein and that such examples are not intended to limit the invention to preferred embodiments described herein and or illustrated herein in existing methods and systems there are some cases in pana in which a notification of authentication and authorization result from the paa pana authentication agent to the pac pana client is made before the paa completes installation of authorization parameters such as e g ciphering keys for the pac to the eps enforcement points as a result it is possible that a pac that has received a notification of the authentication and authorization result is not able to gain the network access desired for example consider the following circumstances a paa and a pac are in different subnets and a link layer address is used as the device identifier of the pac in this case the pam does not know the device identifier of the pac until it receives a pba pana bind answer message from the pac in addition authorization parameters are not installed to the eps before the paa receives the pba message however the pac may start sending data packets immediately after sending the pba message accordingly data packets can be lost until the paa receives.