Patent ID: 8391293

Claim:
A method comprising: receiving an X.25 packet at a Local Area Network (LAN) interface of a network device; identifying if a local Closed User Group (CUG) value is associated with the X.25 packet, the local CUG value identifying a device associated with a device group from which the X.25 packet was received; if a local CUG value is not associated with the X.25 packet, processing the X.25 packet with a hash mechanism to generate the local CUG value and associating the generated local CUG value with the X.25 packet; replacing the local CUG value associated with the X.25 packet with a network CUG value associated with the X.25 packet, the network CUG value being used to identify the X.25 packet as associated with a domain and to control access of the X.25 packet to an X.25 network associated with the domain; and formatting the X.25 packet and the associated network CUG value to generate an IP packet, the IP packet including a plurality of TCP/IP header values generated based on the associated network CUG value.