US 11,949,593 B2
Stateless address translation at an autonomous system (AS) boundary for host privacy
Pradeep Kumar Kathail, Los Altos, CA (US); Eric Voit, Bethesda, MD (US); and David A. Maluf, Mountain View, CA (US)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on May 10, 2022, as Appl. No. 17/740,903.
Prior Publication US 2023/0370373 A1, Nov. 16, 2023
Int. Cl. G06F 15/173 (2006.01); G06F 15/16 (2006.01); H04L 45/42 (2022.01); H04L 45/741 (2022.01); H04L 45/748 (2022.01); H04L 61/251 (2022.01)
CPC H04L 45/741 (2013.01) [H04L 45/42 (2013.01); H04L 45/748 (2013.01); H04L 61/251 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
receiving an address associated with a host device in an Autonomous System (AS), the address comprising a network prefix and an interface identifier (ID);
assigning a cypher value to a cypher bit range in the network prefix, wherein the cypher value is associated with a first cypher algorithm of a plurality of cypher algorithms;
encoding the address, wherein encoding the address comprises applying the first cypher algorithm to encode a coding bit range in the address that is less significant than the cypher bit range; and
using the encoded address for flows from the host device that egress the AS.