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Podcast: Packet Pushers - Weekly Show
Episode:

Show 286: Busting Anycast TCP Myths
Category: Technology
Duration: 00:00:00
Publish Date: 2016-04-29 11:03:47
Description:

Here on the Packet Pushers podcast, we alternate between prognostication and practicality when it comes to networking. Today, we ve got a thought-provoking design show about anycast TCP, a trip on the practical side of the galaxy.

Now, you might thinking, Anycasting IP addresses that are used for TCP applications? Say it isn t so. It simply can t be done. All that statefulness! What if the network changes in-flight? Oh, the humanity!

Indeed. I feel a great disruption in the network, as if millions of sessions timed out in terror and were suddenly terminated. Or was that merely a trip on the Hyperbole Falcon?

To help us sort out the realities of anycast TCP, we’ve got Zaid Ali Kahn, Director of Global Infrastructure Architecture and Strategy at LinkedIn, joining us.

We start with the basics of anycast, explore use cases, and then dig into the technical issues of anycast use in production.

Sponsor: Talari

Talari creates a THINKING SD-WAN that makes the network smart and responsive, adapting in real time to changing conditions. With Talari, mission critical apps like VoIP and VDI take priority and always deliver while less time-sensitive traffic your file backup, for example fall in line. Talari s the proven, leading SD-WAN solution that started in the SD-WAN space before it was labeled as such. Check them out at Talari.com and listen to the Packet Pushers podcast with Talari co-founder and CTO John Dickey.

Sponsor: ITProTV

This episode of the Weekly Show is brought to you by ITProTV. Enhance your technology aptitude. ITProTV is the resource to keep your I.T. skills up to date, with engaging and informative video tutorials. For a free 7­-day trial and 30% off the life of your account, go to itpro.tv/weeklyshow and use the code WEEKLYSHOW30.

Show Notes:

Section 1: The Basics: What Is Anycast?

  1. Defining anycast
  2. How do service providers use anycast?
  3. What are some anycast use cases for enterprises?

Section 2: Understand The Problem Of Anycast With TCP

Section 3: Anycast In Real Life

  1. How stable is a network, really?
  2. Even if the network changes, how often does the nearest anycast IP actually change?
  3. The problem as described is only an issue for long-lived TCP sessions, right?
  4. If a server dies, how quickly can I withdraw my anycast announcement?
  5. BGP only deals in /24 blocks or larger. Is this an issue with anycast, where we might be thinking in terms of a single IP?
  6. Latency vs. hop-count. A lower hop-count does not necessarily equal better performance
  7. Regional vs. global anycast

Section 4: Other Questions

  1. Can applications be engineered to better cope with an anycast environment?
  2. Does IPv6 introduce any new complications into anycast?

Links:

TCP Anycast: Don’t believe the FUD – NANOG presentation (PDF)

TCP over IP Anycast – Pipe dream or Reality? – LinkedIn Engineering blog

The post Show 286: Busting Anycast TCP Myths appeared first on Packet Pushers.
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