ComNets Tutorial: Future Internet with Information Centric Networks Asanga Udugama (1), Carmelita Goerg (1) and Andreas Timm-Giel (2) (1) Communications Networks, TZI, University of Bremen (2) Institute of Communication Networks, Hamburg University of Technology International Conference on Information and Automation for Sustainability (ICIAfS) 2010 December, Colombo, Sri Lanka

ComNets 2 Contents  Motivation  Requirements  Known Architectures  CCN Described in detail  Mechanisms Adopted  Future Direction

ComNets 3 Motivation

ComNets 4 Motivation  Commercial computing came into being during the late 60s and early 70s  Networking was introduced for resource sharing  Named hosts  Model is point-to-point Source: Van Jacobsen, PARC

ComNets 5 Motivation  Movement of content  Predicted global IP traffic in 2014: 64 exabytes/month (4 fold from 2009) (1)  180 exabytes of content created in 2006 (2)  Global mobile traffic will double every year (mostly streaming content) (2)  Current solutions: P2P and CDNs  Location orientation of content  Content associated with named hosts  Sender orientation  Sender can send anywhere  Securing content  Point-to-point model  TLS and SSL secures endpoints (1) IDC (March, 2008). "An Updated Forecast of Worldwide Information Growth Through 2011 (2) P. Jokela, et al, “LIPSIN: Line Speed Publish/Subscribe Inter-networking”, SIGCOMM 2009

ComNets 6 Motivation  Mobility and multi-homing  Device mobility is the norm  Multiple attachments  Mobility currently based on routing or indirection  Adaptation to disruptions  Challenged networks – sparse connectivity, high-speed mobility, disruptions  Problems with network based caching  DRM issues  Security

ComNets 7 Requirements (Expectations)

ComNets 8 Requirements  Information as the first class citizen  Named content not named hosts  Security from inception  Trusted  Prevent attacks  Protection from spam  Flexible and reliable routing  Should include multi-path content delivery  Built-in mobility support  Addressing

ComNets 9 Known Architectures

ComNets 10 Known Architectures  Architectures  Sienna (Publish/Subscribe)  Data Oriented Networking Architecture (DONA)  Publish Subscribe Internet Routing Paradigm (PSIRP)  Network of Information (NetInf)  Content Centric Networking (CCN)  Operation Differentiation  Naming  Security  Routing  Caching  Content existence knowledge  Producer-consumer meeting

ComNets 11 Content Centric Networks – Operation Interest Data Check Content Store Check Pending Interests Table Check Forwarding Information Base Check Pending Interests Table

ComNets 12 Content Centric Networks – Stack  Change of network abstraction from “named hosts” to “named content”  Security built-in: secures content and not the hosts  Mobility is present by design  Can handle static as well as dynamic content  Use of 2 messages: Interest and Data Object (1) (1) Van Jacobson, et al, Networking Named Content, CoNEXT 2009

ComNets 13 Content Centric Networks – Architecture  Each CCN entity has 3 main data structures  Content Store, Pending Interest Table, Forwarding Information Base  Uses multicast/broadcast  Uses “longest prefix matching” lookup for content names

ComNets 14 Content Centric Networks – Messages  Purpose of messages  Interests request for content  Data serves these requests  No fixed length fields and uses an XML encoding format

ComNets 15 Content Centric Networks – Names  Core of CCN uses content names for forwarding  Applications can interpret names the way they want

ComNets 16 Content Centric Networks - CS  Uses “longest prefix matching”  Implements policies such as LRU or LFU for content replacement  Content do not necessarily have to be persistent (only cached)

ComNets 17 Content Centric Networks – PIT  Uses “longest prefix matching”  An entry may point to multiple faces  Must time out and not held permanently

ComNets 18 Content Centric Networks – FIB  Uses “longest prefix matching”  Similar to IP FIB  Destination may have number of faces

ComNets 19 Content Centric Networks – Interest

ComNets 20 Content Centric Networks – Data

ComNets 21 Mechanisms Adopted

ComNets 22  Content Centric Networks  Naming: Hierarchical naming, single address  Security: Signed content  Routing: Longest prefix matching  Caching: Local or network based  Content existence knowledge: Not part of the CCN core  Producer-consumer meeting: Propagation of interests  Network of Information  Naming: Flat naming  Security: Signed content  Routing: (1) Name resolution (2) Information transfer  Caching: Network based  Content existence knowledge: Through name resolution service  Producer-consumer meeting: Name resolution service provide locations Mechanisms Adopted – Summary I

ComNets 23 Mechanisms Adopted – Summary II  Publish Subscribe Internet Routing Paradigm  Naming: Multi-level identifiers  Security: Signed content  Routing: (1) Name resolution (2) Information transfer  Caching: Network based  Content existence knowledge: Registrations in Rendezvous system  Producer-consumer meeting: Rendezvous system provides location  Data Oriented Networking Architecture  Naming: Flat naming  Security: Signed content  Routing: Queries are resolved to locations  Caching: Network based  Content existence knowledge: Through resolution infrastructure  Producer-consumer meeting: Resolution infrastructure provides location

ComNets 24 Future Direction

ComNets 25 Future Direction  Projects (past and present)  FP7 – 4WARD, SAIL  FP7 – PSIRP, PERSUIT  FIA – NDN  Areas to consider  Naming (flat, hierarchical, mixed)  Architecture (Publish-subscribe or request-response)  Security (hacked algorithms)  Coexistence (different architectures)  Migration (legacy networks)  Scalability  Privacy  Deployment (users, access network operators, connectivity network operators content providers, application developers)

ComNets 26 Thank you. Questions?