Beta 1

Title Design of a Hardware Network Address Translation Unit for a Single Chip High-Speed Ethernet Router
Author Jensen, Martin Rolsted
Supervisor Sparsø, Jens (System-on-Chip Hardware, Department of Informatics and Mathematical Modeling, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2009
Abstract The general objective of this thesis work is to design and evaluate a Network and Address & Port Translation (NAPT) core, which is typically found in and as a part of a Small- Office or Small-Home (SOHO) Ethernet router. The NAPT core makes it possible for e.g. a wireless router to share only one public IP address, provided by an Internet Service Provider (ISP), with several internal hosts on a private Local Area Network (LAN), even though the internal hosts are connecting simultaneously. The main functionality of the NAPT core is to modify the header information of both in- and outbound IP packets transversing the NAPT. This process of manipulating, also called translation, involves time-critical lookups in various tables. To comply with the expected operation these tables are typically realized by ordinary memory blocks and incorporates some algorithm to make the lookup fast. In this work a table structure is realized with the use of Content Addressable Memory (CAM) modules for the lookup process and will be evaluated, first of all to find out if a CAM actually can be used for the purpose and secondly to find out, if it can support a network bandwidth of 2 Gbps. At first the reader will be introduced to the fundamentals of the NAPT in Chapter 2, whereafter the actual analysis and design of a NAPT core is carried out. The analysis and design Chapter 3 is structured in an itemized way, where the different demands are treated. Typically the structure is equal for each item, starting with an introduction to the problem followed up by one or more design solutions and finally the subject of the item is discussed with pro and cons and relevant security considerations. The implemented parts of the project are presented in Chapter 4 and a functional test of the implemented part is carried out in Chapter 5. Finally the achived results are presented in Chapter 6 and a discussion of potential future work is made in Chapter 7. In the last chapter 8 ii a conclusion is given.
Imprint Technical University of Denmark (DTU) : Kgs. Lyngby, Denmark
Series IMM-M.Sc.-2009-27
Original PDF ep09_27.pdf (4.28 MB)
Admin Creation date: 2009-06-10    Update date: 2010-08-25    Source: dtu    ID: 244423    Original MXD