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General

NANOG Tutorials: A great resource with a long list of tutorials on many aspects of networking by leading experts.

2009 Internet Observatory Report - NANOG 47 Presentation by Craig Labovitz A very interesting and thought-provoking presentation on the evolution of the Internet and its implications.
Addressing the Future Internet. An article by Geoff Huston,a distinguished routing engineer with extensive experience and insight into the Internet, its technology and more importantly its operation. This article together with other documents from the workshop for which it was produced are a nice complement to the article by Mark Handley on why the Internet just works.
Why the Internet Only Just Works. A good, even if a bit simplified, summary of the good and the bad about the Internet, and the implications this may have for its future.
Classes IP address subnetting and supernetting A primer on IP subnetting and supernetting. ** NEW **
A NAT Primer A primer on static and dynamic NAT. ** NEW **

Understanding BGP convergence ** NEW **
OSPF Tutorial.
IS-IS Presentation: Abe Martey (Cisco) NANOG presentation on IS-IS
OSPF vs. IS-IS: Dave Katz (Juniper) OSPF vs IS-IS NANOG Presentation
IS-IS Deployments and New Features: Shankar Vemulapalli (Cisco) NANOG Presentation on IS-IS.
Introduction to IP Multicast Practice: Bill Nickless NANOG Tutorial.
Introduction to EIGRP. Cisco's basic introduction to the EIGRP protocol.
EIGRP Specification. Cisco's detailed specification and configuration of EIGRP.
Tim Griffin ICNP 2002 BGP Tutorial.
Another BGP Tutorial. Tutorial on "BGP for Internet Service Providers" by Philip Smith, presented at RIPE'40.

MPLS Tutorial: Joe Soricelli (Juniper) Introduction to MPLS NANOG Presentation
Juniper software guide on traffic engineering and MPLS. JUNOS Internet Software Configuration Guide: MPLS Applications.
BGP/MPLS Layer 3 VPNs: Ira Minei NANOG Presentation
Juniper's VPN Guide.
MPLS Deployment Survey: A survey from Cariden on who is using MPLS and how (presented at MPLS 2011).

A Primer on IP Addresses by Chris Lewis.
Tutorial on High-Speed Lookups.
Data Structures and Algorithms. An on-line book with useful material on search trees, including AVL trees.
NIST Link to Trie and Tree Structures.
Tutorial on IP Lookup and packet classification. A set of slides that review current approaches to both standard IP address lookup (in forwarding tables) and more complex flow-level packet classification techniques.

Resource Reservation (RSVP) Tutorial: From Cisco's web site.
Network Calculus. Jean-Yves Le Boudec (EPFL) Web Page on Network Calculus.
OpenNetworking Lab (ONL) Tutorial. A tutorial on the ONL resources, including a chapter on "Filters, Queues, and Bandwidth" that includes a section on the token bucket (under Link Rates).
Matthew Roughan page on traffic matrices: A page with a wealth of information, including papers and presentations, on how to obtain traffic matrices and the various solutions that have been proposed for that purpose.
Best Practices for Determining the Traffic Matrix in IP Networks: APRICOT 2005 presentation by T. Telkamp discussing various tools and approaches, in particular based on NetFlow, for constructing traffic matrices.
Best Practices in Network Planning and Traffic Engineering: Presentation at RIPE 61, Rome, Italy, November 2010.

Active IETF Working Groups.
RFC 1918: Address Allocation for Private Internets
RFC 1631: NATs
RFC 3056: 6to4
RFC 3068: 6to4 anycast
RFC 4271: BGP-4
RFC 4456: Route Reflectors
RFC 1195: IS-IS
RFC 2328: OSPFv2
RFC 2740: OSPFv3 (for IPv6)
RFC 3101: OSPF NSSA Option
RFC 2453: RIPv2
RFC 1075: DVMRP
RFC 1584: MOSPF
RFC 2189: CBTv2
RFC 2201: CBT Architecture
RFC 2362: PIM
RFC 4601: PIM Sparse Mode
RFC 3973: PIM Dense Mode
RFC 5015: Bidirectional PIM
RFC 5059: Bootstrap Router (BSR) Mechanism for PIM
RFC 4610: Anycast RP Using PIM
RFC 3618: Multicast Source Discovery Protocol
RFC 3810: Multicast Listener Discovery Protocol
RFC 3569: Source-Specific Multicast (SSM) Overview
RFC 4607: SSM Specifications
RFC 2205: Resource Reservation Protocol (RSVP)
RFC 2210: RSVP and Int-Serv
RFC 3209: REVP Traffic Engineering Extensions
RFC 2211: Controlled Load Service
RFC 2212: Guaranteed Service
RFC 2475: Diff-Derv Architecture
RFC 2474: DS Field Definition
RFC 2597: Assured Forwarding Per Hop Behavior (PHB) Group
RFC 3246: Expedited Forwarding PHB
RFC 3031: MPLS Architecture
RFC 3063: Label Distribution Protocol (LDP)
RFC 3036: MPLS Loop Prevention
RFC 2702: MPLS Traffic Engineering Requirements
RFC 3272: Traffic Engineering Principles
RFC 4364: BGP/MPLS VPNs
RFC 4577: OPSF as the PE/CE Protocol in BGP/MPLS VPNs
RFC 5101: Specification of the IP Flow Information Export (IPFIX) Protocol for the Exchange of IP Traffic Flow Information
RFC 5102: Information Model for IP Flow Information Export