Archive

Category Archives for "Networking"

Things that cannot go wrong

Found this Douglas Adams quote in The Signal and the Noise (a must-read book):

The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair

I’ll leave to your imagination how this relates to stretched VLANs, ACI, NSX, VSAN, SD-WAN and a few other technologies.

Weekend Reads 2017-05-11

We’re quietly replacing an open web that connects and empowers with one that restricts and commoditizes people. We need to stop it. I quit Facebook seven months ago. Despite its undeniable value, I think Facebook is at odds with the open web that I love and defend. This essay is my attempt to explain not only why I quit Facebook but why I believe we’re slowly replacing a web that empowers with one that restricts and commoditizes people. And why we should, at the very least, stop and think about the consequences of that shift. –Parimal Satyal @ Neustadt.fr

Two clocks are ticking for US tech companies in the power centers of the modern world. In Washington, lawmakers are working to reform FISA Section 702 before it expires on December 31st, 2017. Section 702 is the main legal basis for US mass surveillance, including the programs and techniques that scoop up the data transferred by non-US individuals to US servers. Upstream surveillance collects communications as they travel over the Internet backbone, and downstream surveillance (better known as PRISM) collects communications from companies like Google, Facebook, and Yahoo. –Danny O’Brien @ EFF

Arguably, a good deal of Americans are in Continue reading

Cloudflare Wants to Buy Your Meetup Group Pizza

Cloudflare Wants to Buy Your Meetup Group Pizza

Cloudflare Wants to Buy Your Meetup Group Pizza

If you’re a web dev / devops / etc. meetup group that also works toward building a faster, safer Internet, I want to support your awesome group by buying you pizza. If your group’s focus falls within one of the subject categories below and you’re willing to give us a 30 second shout out and tweet a photo of your group and @Cloudflare, your meetup’s pizza expense will be reimbursed.

Get Your Pizza $ Reimbursed »

Developer Relations at Cloudflare & why we’re doing this

I’m Andrew Fitch and I work on the Developer Relations team at Cloudflare. One of the things I like most about working in DevRel is empowering community members who are already doing great things out in the world. Whether they’re starting conferences, hosting local meetups, or writing educational content, I think it’s important to support them in their efforts and reward them for doing what they do. Community organizers are the glue that holds developers together socially. Let’s support them and make their lives easier by taking care of the pizza part of the equation.

Cloudflare Wants to Buy Your Meetup Group Pizza

What’s in it for Cloudflare?

  1. We want web developers to target the apps platform
  2. We want more people to Continue reading

An Opinion On Offense Against NAT

It’s been a long time since I’ve gotten to rant against Network Address Translation (NAT). At first, I had hoped that was because IPv6 transitions were happening and people were adopting it rapidly enough that NAT would eventually slide into the past of SAN and DOS. Alas, it appears that IPv6 adoption is getting better but still not great.

Geoff Huston, on the other hand, seems to think that NAT is a good thing. In a recent article, he took up the shield to defend NAT against those that believe it is an abomination. He rightfully pointed out that NAT has extended the life of the modern Internet and also correctly pointed out that the slow pace of IPv6 deployment was due in part to the lack of urgency of address depletion. Even with companies like Microsoft buying large sections of IP address space to fuel Azure, we’re still not quite at the point of the game when IP addresses are hard to come by.

So, with Mr. Huston taking up the shield, let me find my +5 Sword of NAT Slaying and try to point out a couple of issues in his defense.

Relationship Status: NAT’s…Complicated

The first Continue reading

Introduction to Network Time Protocol (NTP) and Basic Configurations

Today I am going to discuss about the NTP or so called Network Time Protocol. I knew many of you already aware about the use of NTP in our networks but as it was asked by some guys who follow our blogs, So I am happy to explain the NTP little bit with the configurations.

What is Network Time Protocol or NTP ?
So, NTP is Network Time Protocol which is generally used to synchronise of the devices to some specific time references. NTP uses UDP protocol to communicate with all the devices in the network and all NTP communications in the network will be synchronised with the defined universal time in the network.

How they synchronise with the time source ?
NTP server usually receives its time from a trustworthy time source, such as a radio clock attached to a time server, and then distributes this time across the network. NTP is extremely efficient and there is no more than one packet per minute is necessary to synchronize two machines to within a millisecond of each other

An Network Time Protocol actually uses a layer to describe the distance between a network device and an authoritative time source

IDG Contributor Network: Thoughts & prayers don’t stop mass shooters. Technology might.

It’s heartbreaking. Gun violence kills 93 Americans every day while politicians send their thoughts and prayers. 2017 has seen two of the deadliest mass shootings in American history.How can technology help reduce mass shootings? How can shooters be authenticated before they can fire? How can the police be alerted when a large number of firearms are present at an unusual location? Can an excessive number of shots fired be prevented?Background Americans make up about 4.4 percent of the global population but own 42 percent of the world’s guns. And approximately one in three gunmen is American according to a study by Adam Lankford, a professor at the University of Alabama. Firearms are an $11 billion per year industry with over 300 million existing guns in circulation. About 40% of Americans say they own a gun or live in a household with one. A recent survey reports that the US has the highest rate of murder by firearms in the developed world. Mass shootings cost Americans over $229 billion per year.To read this article in full, please click here

On the dangers of Intel’s frequency scaling

While I was writing the post comparing the new Qualcomm server chip, Centriq, to our current stock of Intel Skylake-based Xeons, I noticed a disturbing phenomena.

When benchmarking OpenSSL 1.1.1dev, I discovered that the performance of the cipher ChaCha20-Poly1305 does not scale very well. On a single thread, it performed at the speed of approximately 2.89GB/s, whereas on 24 cores, and 48 threads it performed at just over 35 GB/s.

CC BY-SA 2.0 image by blumblaum

Now this is a very high number, but I would like to see something closer to 69GB/s. 35GB/s is just 1.46GB/s/core, or roughly 50% of the single core performance. AES-GCM scales much better, to 80% of single core performance, which is understandable, because the CPU can sustain higher frequency turbo on a single core, but not all cores.

alt

Why is the scaling of ChaCha20-Poly1305 so poor? Meet AVX-512. AVX-512 is a new Intel instruction set that adds many new 512-bit wide SIMD instructions and promotes most of the existing ones to 512-bit. The problem with such wide instructions is that they consume power. A lot of power. Imagine a single instruction that does the work of 64 regular Continue reading

Rough Guide to IETF 100: Identity, Privacy, and Encryption

Identity, privacy, and encryption continue to be active topics for the Internet Society and the IETF community impacting a broad range of applications. In this Rough Guide to IETF 100 post, I highlight a few of the many relevant activities happening next week in Singapore, but there is much more going on so be sure to check out the full agenda online.

Encryption

Encryption continues to be a priority of the IETF as well as the security community at large. Related to encryption, there is the TLS working group developing the core specifications, several working groups addressing how to apply the work of the TLS working group to various applications, and the Crypto-Forum Research Group focusing on the details of the underlying cryptographic algorithms.

The Transport Layer Security (TLS) working group is a key IETF effort developing core security protocols for the Internet. This week’s agenda includes both TLS 1.3 and Datagram Transport Layer Security. Additionally, the TLS working group will be discussing connection ID, exported authenticators, protecting against denial of service attacks, and application layer TLS. The TLS working group is very active and, as with all things that are really important, there are many Continue reading

Deploy360’s Hot Topics at IETF 100

Next week is IETF 100 in Singapore which will be the first time the IETF has been held in the country. The Deploy360 team will be represented by Megan Kruse and Dan York, along with ISOC’s Chief Internet Technology Officer Olaf Kolkman. We’re again highlighting the latest IPv6, DNSSEC, Securing BGP, TLS and IoT related developments.

Below are the sessions that we’ll be following. Note this post was written in advance so please check the official IETF 100 agenda for any updates, room changes, or final details.

Monday, 13 November 2017

Tuesday, 14 November 2017

1 … 1,569 1,570 1,571 1,572 1,573 … 3,455