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| Content Provider | ACM Digital Library |
|---|---|
| Author | Morimoto, Masaharu Zave, Pamela Rexford, Jennifer Zou, Xuan Kelvin Ferreira, Ronaldo A. |
| Abstract | Middleboxes are crucial for improving network security and performance, but only if the right traffic goes through the right middleboxes at the right time. Existing traffic-steering techniques rely on a central controller to install fine-grained forwarding rules in network elements---at the expense of a large number of rules, a central point of failure, challenges in ensuring all packets of a session traverse the same middleboxes, and difficulties with middleboxes that modify the "five tuple." We argue that a session-level protocol is a fundamentally better approach to traffic steering, while naturally supporting host mobility and multihoming in an integrated fashion. In addition, a session-level protocol can enable new capabilities like dynamic service chaining, where the sequence of middleboxes can change during the life of a session, e.g., to remove a load-balancer that is no longer needed, replace a middlebox undergoing maintenance, or add a packet scrubber when traffic looks suspicious. Our Dysco protocol steers the packets of a TCP session through a service chain, and can dynamically reconfigure the chain for an ongoing session. Dysco requires no changes to end-host and middlebox applications, host TCP stacks, or IP routing. Dysco's distributed reconfiguration protocol handles the removal of proxies that terminate TCP connections, middleboxes that change the size of a byte stream, and concurrent requests to reconfigure different parts of a chain. Through formal verification using Spin and experiments with our Linux-based prototype, we show that Dysco is provably correct, highly scalable, and able to reconfigure service chains across a range of middleboxes. |
| Starting Page | 57 |
| Ending Page | 70 |
| Page Count | 14 |
| File Format | |
| ISBN | 9781450346535 |
| DOI | 10.1145/3098822.3098827 |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2017-08-07 |
| Publisher Place | New York |
| Access Restriction | Subscribed |
| Subject Keyword | Session protocol Spin Verification Nfv |
| Content Type | Text |
| Resource Type | Article |
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