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Vint Cerf: SDN Is a Model For a Better Internet

Steve Blake Re:Please stop trying to make the Internet better (69 comments)

An insightful rant.

We have only been building multitasking OSes for what, 50+ years, and yet people feel the need to instantiate a full VM just to run an additional instance of an application. Of course, the fact that many apps run on well known TCP ports (instead of using DNS service names) makes it difficult to demultiplex to multiple instances of the same app, unless each instance is running in a VM with a virtualized NIC address. IPv6 could fix this problem without the overhead of virtualization (give each app instance it's own IPv6 address).

Mobile IP and LISP are just bandaids trying to stem the bleeding from the poor design of TCP/IPv4, which ties application instance naming to a small port number plus a topology locator. ILNPv6 (RFC6740) or HIP (RFC 5201) fix the same problems in much more elegant ways.

SDN, properly conceived, has some valid technical use cases. Centralized, reactive, per-flow switching is not one of them (wait and see how the network behaves on a node-down). A lot of what has driven SDN to-date is not technical, but political: break the Cisco strangle-hold and provide something shiny for the VCs to pour money into.

about a year ago
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Broadcom To Buy NetLogic For $3.7 Billion

Steve Blake Re:Why would they do that !?! (35 comments)

NetLogic owns the TCAM market. You can't build high-end router without TCAMs.

more than 2 years ago
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A Deep-Dive Look At Samsung's Galaxy Tab 10.1

Steve Blake Re:What about the Eee Pad? (264 comments)

I don't believe the Galaxy 10.1 has a memory slot (at least, I have not found any spec sheet online that mentions it). Major FAIL if true.

more than 3 years ago
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Osama Bin Laden Reported Dead, Body In US Hands

Steve Blake Re:Mission Accomplished (1855 comments)

Personally, I would like to see his head on a pike outside the Pentagon.

more than 3 years ago
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String Theory Tested, Fails Black Hole Predictions

Steve Blake Re:I think it's good either way (307 comments)

Laffer never claimed that the curve (tax rate vs. collected revenue) was a smooth parabola.

more than 3 years ago
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ARM-Based Servers Coming In 2011

Steve Blake Re:Whatever happened to MIPS? (253 comments)

Look at Cavium Octeon or Netlogic (was RMI) XLR/XLS/XLP. All of these are multicore MIPS. They are frequently used in security appliances, but occassionally also in storage boxes.

more than 4 years ago
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Senators Blast NASA For Lacking Vision

Steve Blake Re:Mars (319 comments)

There is absolutely no catastrophy that could happen to Earth that would make it less habitable than Mars.

more than 4 years ago
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New Router Manages Flows, Not Packets

Steve Blake Re:Little help? (122 comments)

IntServ assumed that flows are signalled (with RSVP). The Anagram box (and the Caspian box before it) detects the first packet in a flow (by a miss in the flow cache), and then creates a flow cache entry.

The utility of this feature is very questionable, especially since routers have been able to IP forward and apply ACLs at line rate for years.

more than 5 years ago
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Cox Communications and "Congestion Management"

Steve Blake Re:umm.. Not Throttleing (282 comments)

And they are free to ignore the QoS flags (i.e., DSCP field) that you set, or even rewrite it. That's part of the Diffserv architecture.

"Throttling" is blocking transmission even when there is available link capacity. Hopefully they will instead use some form of priority scheduling, so that delay insensitive traffic is only affected whenever a link is congested (that is basically what they say they are going to do).

more than 5 years ago
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Urine Passes NASA Taste Test

Steve Blake Re:disgusting? (404 comments)

Water in, water out. Water back in.

more than 5 years ago

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