filtering of data packets at a network gateway, a policy enforcement point for dienstbasierte directives (sblp) works

摘要

The invention concerning a method of filtering data packets being transmitted from a source code node to a destination node via a network gateway during a packet data communication session. Filtering is carried out at said network gateway (GGSN). The data packets having a header including a destination address and an extension header which is used for transmitting further address information during said second period, the method comprising selectively blocking ones of the data packets where the destination address does not meet a destination address criterion or a forwarding agent criterion which defines an address of a least one forwarding agent which forwards packets addressed to the forwarding agent to a destination node at a network address specified in the payload of the packet.