Celebrating ECMP in Linux — part two

In part one of our series on ECMP, we discussed the basics of ECMP, the recent changes that have been made and Cumulus’ part in moving the ball forward for Linux networking. Now, it’s time to get a little more technical and review how advancements in ECMP development for IPv4 and IPv6 have made ECMP what it is today — and what it can be in the near future.

Setting the stage: defining our terminologies

Hashing algorithms

Hashing algorithms are the biggest component of ECMP behavior, so it makes sense for us to talk for a moment about what we specifically mean when we refer to each one.

1.) Per-packet hash
This hash was the original hashing algorithm used in the kernel’s ECMP behavior. It is trivially simple to understand as it basically uses a pseudo random number in the kernel at the time packet is being processed (jiffies) to determine which link in an ECMP bundle the traffic will use for egress. With this algorithm in place, each packet for a single flow could use a different link to get to the destination. This leads to all kinds of bad behaviors in TCP and higher level applications/protocols Continue reading

Show 387: AWS Networking – A View From The Inside

In this episode of Packet Pushers, it’s AWS networking. You use AWS and think you know what you need to know? Maybe, but our guest today can probably share a thing or two you didn t even know were things when it comes to networking in the Amazon public cloud.

Our guest is Nick Matthews, Principal Solutions Architect at Amazon Web Services. Nick focuses on networking and security.

Nick pinged us, hoping to share  his perspective on cloud networking from the inside. Come and have a look.

We talk about how networking basics do–and don’t–map to the cloud, and how the architecture of cloud applications influence network design and operations.

We also explore AWS networking elements under the hood, such as Hyperplane, and how trends such as SD-WAN and SDN influence Amazon networking.

Show Links:

AWS re:Invent 2015 | (NET403) Another Day, Another Billion Packets – Amazon (via YouTube): Eric Brandwine talks about how Amazon’s overlay network works in detail.

AWS re:Invent 2017: Another Day, Another Billion Flows (NET405) – Amazon (via YouTube): Colm MacCarthaigh talks about how AWS Hyperplane works.

Introducing the AWS Networking Competency – AWS

AWS Networking Competency Technology Partner Validation Checklist – AWS (PDF)

Firewall Deployment Continue reading

Sluggish Moore’s Law Doesn’t Impede Intel One Bit

The demand for compute is so strong among the hyperscalers and cloud builders that nothing seems to be slowing down Intel’s datacenter business. Not delays in processor rollouts due to the difficulties in ramping 14 nanometer and 10 nanometer processes as the pace of Moore’s Law increases in transistor density and the lowering of the cost of chips slows. Not what is a pretty substantial price increase that accompanies the core scale out and feature expansion in the “Skylake” Xeon SP processors. Not the credible competition from IBM, AMD, Cavium, and Qualcomm.

The sun is shining on the datacenter, and …

Sluggish Moore’s Law Doesn’t Impede Intel One Bit was written by Timothy Prickett Morgan at The Next Platform.

Stuff The Internet Says On Scalability For April 27th, 2018

Hey, it's HighScalability time:

 

Did ancient Egyptians invent Wi-Fi? @sherifhanna

Do you like this sort of Stuff? Please lend me your support on Patreon. It would mean a great deal to me. And if you know anyone looking for a simple book that uses lots of pictures and lots of examples to explain the cloud, then please recommend my new book: Explain the Cloud Like I'm 10. They'll love you even more.

  • $17,500: price to give up Google search; 51.8,31.2,18.79: % using AWS, Azure, Google for IoT; 400: items per second shipped by peak Amazon; 43%: music revenues came from streaming; 800%: boost in downloads from apps featured by the Apple App Store; 45: average age of startup founder; 

  • Quotable Quotes:
    • Broad Band: By the mid-twentieth century, computing was so much considered a woman’s job that when computing machines came along, evolving alongside and largely independently from their human counterparts, mathematicians would guesstimate their horsepower by invoking “girl-years,” and describe units of machine labor as equivalent to one “kilogirl.”
    • thegayngler: Most engineers would not hire themselves. That has been apparent to me for awhile now. Continue reading

Why intent-based networking is important to the Internet of Things

Last week, Cisco made a number of product announcements that deliver the benefits of its intent-based networking (IBN) solution to Internet of Things (IoT) deployments.  Network World's Michael Cooney did a great job summarizing all the product announcements, so I won’t rehash that information, but I did want to discuss the importance of IBN to IoT.The importance of IBN to IoT IBN is something that has been theorized for almost a decade, but solutions only became available recently. The reason why there has been a lag between vision and product is that network engineers didn’t really need IBN to run their networks until recently. Environments were closed, applications were on premises, and everything was under the tight control of the IT organization.To read this article in full, please click here

Why intent-based networking is important to the Internet of Things

Last week, Cisco made a number of product announcements that deliver the benefits of its intent-based networking (IBN) solution to Internet of Things (IoT) deployments.  Network World's Michael Cooney did a great job summarizing all the product announcements, so I won’t rehash that information, but I did want to discuss the importance of IBN to IoT.The importance of IBN to IoT IBN is something that has been theorized for almost a decade, but solutions only became available recently. The reason why there has been a lag between vision and product is that network engineers didn’t really need IBN to run their networks until recently. Environments were closed, applications were on premises, and everything was under the tight control of the IT organization.To read this article in full, please click here

What Happened? The Amazon Route 53 BGP Hijack to Take Over Ethereum Cryptocurrency Wallets

Yesterday, we published a blog post sharing the news and some initial details about Amazon’s DNS route hijack event to steal Ethereum cryptocurrency from myetherwallet.com. In this post, we’ll explore more details about the incident from the BGP hijack’s perspective.

As noted by Dyn, CloudFlare, and various other entities who monitor Internet routing and health, Amazon’s Route 53 (the DNS service offered by AWS) prefixes were hijacked. A BGP update taken from Isolario suggests that on 24 April, its BGP feeders were correctly receiving 205.251.192.0/23, 205.251.194.0/23, 205.251.196.0/23, 205.251.198.0/23, originated from Amazon (AS16509), until 11:04:00 (UTC). But, at 11:05:41 (UTC), Isolario recorded the first more specific /24 malicious announcements via BGP feeder and the announcements originated from eNET (AS10297) to its peer 1&1 Internet SE (AS8560). Click to enlarge image.

RIPE Stats collected the first more specific malicious advertisement at 11:05:42 (UTC) originating from eNET (AS10297), but this time through peer Hurricane Electric (AS6939).

Exactly at the same time, 11:05:42 (UTC), the Isolario BGP feeder received another update originating from eNET (AS10297) and it was also coming via Hurricane Electric (AS6939). Click to enlarge image.

Hurricane Electric has a worldwide Continue reading

CiscoLive 2018: ‘Summer Camp for Geeks’

Are you ready for CiscoLive US 2018?  Ready for Summer Camp for Geeks?!    I think it is hard to truly be completely ready for the experience nowadays.  Why?  Because CiscoLive US is just huge with so many options of things to experience as an attendee…. more options than you have time for.  If you have been to CiscoLive US before… you KNOW this is true. And every year more and more …. and more and more … get added.  For 2018 my favorite CiscoLive add is the new ‘Content Cafe’ session type (30 minutes).  Other favorites of mine are the ‘Flip Sessions’ and the “Beers with Engineers”.  ?

Deciding where to spend your time and energy during #CLUS can be overwhelming and daunting.

What is my absolute #1 suggestion to anyone going to a CiscoLive event?  Easy – “Begin with the End in Mind“.  Know what your priorities are and then schedule your week accordingly.

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STEP #1: Create Your Cisco Live 2018 Priority List

Take your goals and translate them into a priority list.

STEP #2: Learn from the Past

If you have been to CiscoLive before… Continue reading

Schneider Electric announces Edge Module for IoT processing

Schneider Electric is the latest player to jump into the edge computing game for Internet of Things (IoT) devices with the announcement of its Edge Module for mobile and IoT applications. It follows the trend of processing IoT data where it is generated rather than sending it to a remote data center.Schneider Electric is a European giant that mostly specializes in energy management and power systems. So, it’s no surprise that the Edge Module comes with integrated power and cooling systems. That includes single- or three-phase power with a flexible power train in multiple ranges, N+1 standard cooling, and package cooling units mounted on the outside of the module to eliminate the need for external condensers or piping.To read this article in full, please click here

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