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| Content Provider | ACM Digital Library |
|---|---|
| Author | Sommers, Joel |
| Abstract | Developing systems-level networking software to implement switches, routers, and middleboxes is challenging, rewarding, and arguably an essential component for developing a deep understanding of modern computer networks. Unfortunately, existing techniques for building networked system software use low-level and error-prone tools and languages, making this task inaccessible for many undergraduates. Moreover, working at such a low-level of abstraction complicates debugging and testing and can make assessment difficult for instructors and TAs. We describe a Python-based environment called Switchyard that is designed to facilitate student projects for building and testing software-based network devices like switches, routers, and middleboxes. Switchyard exposes a networking abstraction similar to a \textit{raw socket}, which allows a developer to receive and send Ethernet frames on specific network ports, and provides a set of classes to simplify parsing and construction of packets and packet headers. Systems-level software created using Switchyard can be deployed on a standard Linux host or in an emulated environment like Mininet. Perhaps most importantly, Switchyard provides facilities for test-driven development by transparently allowing the underlying network to be replaced with a test harness that is specifically designed to help students through the development and debugging process. We describe experiences with using Switchyard in an undergraduate networking course in which students created an Ethernet learning switch, a fully functional IPv4 router, a firewall with rate limiter, and a deep-packet inspection middlebox device. |
| Starting Page | 651 |
| Ending Page | 656 |
| Page Count | 6 |
| File Format | |
| ISBN | 9781450329668 |
| DOI | 10.1145/2676723.2677211 |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2015-02-24 |
| Publisher Place | New York |
| Access Restriction | Subscribed |
| Subject Keyword | Test-driven development Middleboxes Routing Switching |
| Content Type | Text |
| Resource Type | Article |
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