System and method of protection against denial of service in a telecommunications system.

A method for an access router for protecting a telecommunication network against a flooding attack from a network node multiple interfaces, providing communication router access between the network node multiple interfaces and a network node acting as NC node corresponding to the network node multiple interfaces, the method comprising the steps of: transferring (300) data between the network node multiple interfaces and CN; determining (302) if the network node multiple interfaces remain affordable; if the network node multiple interfaces remains affordable, continue transferring data between the NC and the network node multiple interfaces; and after determining that the network node multiple interfaces is no longer reachable, to the NC instructions to clean the information stored in buffer associated with the network node multiple interfaces.