Archive

Category Archives for "Networking"

DNS over TLS: experience from the Go6lab

After the experiment with DPRIVE at IETF99, we thought we’d try to implement it in the Go6lab and see how this actually works in day-to-day reality.

The first step was to take a look at https://dnsprivacy.org/wiki/ as we had a feeling this might be the best source for information around this topic. There’s a ton of info about DNS over TLS, but what we were really looking for was simple instructions on how to setup a recursive DNS server to serve DNS responses over TLS (port 853), as well as how to setup a local client on our device that could talk to the server and accept local DNS queries over TLS, thereby protecting our DNS communications over the Internet.

We decided that running a  TLS proxy was not the way to do it, so we used CentOS 7 VPS with Unbound installed. After some time and with extensive help from Willem Toorop from NLnet Labs (thanks Willem!!!) we managed to navigate the setup process for server and client.

Firstly, we installed the default Unbound from the CentOS7 default yum repositories, which turned out not to be a very good idea, as this version is 1.4.20 Continue reading

Worth Reading: Malware in your screen

Phone touchscreens, and other similar hardware components such as orientation sensors, wireless charging controllers, and NFC readers, are often produced by thirdparty manufacturers and not by the phone vendors themselves. Third-party driver source code to support these components is integrated into the vendor’s source code. In contrast to “pluggable” drivers, such as USB or network drivers, the component driver’s source code implicitly assumes that the component hardware is authentic and trustworthy. As a result of this trust, very few integrity checks are performed on the communications between the component and the device’s main processor. —Shattered Trust (PDF)

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Hey Alexa, Turn my lab on!

TL/DR Put together a custom Alexa Skill so I can turn switches and routers off in my lab as shown in the video here. Feels pretty great.

 

As most of my twitter followers have noticed, I’ve been doing a lot of Home Automation, mostly with Apple #homeKit. But I also picked up an Amazon Dot because… well why not?

One of the great things abut the digital voice assistance from Amazon, is that they have created an extensible framework that enables those with a little bit of coding skills to add to Mrs. A’s already already impressive impressive array of abilities.

The Amazon Alexa developer page is pretty impressive. There’s a ton of information and tutorials there, as well as an SDK and code examples in Node.js. I’m almost exclusively a python coder at this point, so I decided to look for something a little more familiar and came upon this.

Flask-Ask

Flask-Ask is a Flask extension that makes building Alexa skills for the Amazon Echo easier and much more fun.

Essentially, John Wheeler took the flask WSGI ( web) framework and made it super easy to be able to create Amazon Alexa skills using this familiar library. Continue reading

Worth Reading: It’s okay to forget what you read

Many of us feel this near-existential fear that we might “lose” what wisdom we extract from the books we read.Such fears are unfounded. First of all, if you love books, memory is never a problem. If I read for pure pleasure, what harm is there is forgetting? I get to enjoy the same wonderful book over and over again — for the book-lover, what better gift is there than forgetfulness? But many of us read books for reasons other than pleasure. We want to get something from the books we read. There is much written on retaining what you read (note it, connect it, summarize it, teach it, yawn…), but Paul Graham, I think, has something new and interesting to say. —Charles Chu on Medium

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Upcoming Events and Webinars

You might have noticed the “upcoming webinars” blog widget is gone and I’ll write a blog post every two weeks or so to keep you updated on upcoming webinars and other events.

Here’s what’s coming in September and October 2017:

Istanbul/Turkey Onsite CCDE Training – 50% OFF until Sep-15, 2017

Istanbul/Turkey Onsite CCDE Training will be held between October 30 – November 4.   Course will be in English as usual, everyday will be between 9am – 6pm, 9 hours.   I am going to extend my CCDE Materials for this course as there was new scenarios and the technologies after August 29, 2017 CCDE […]

The post Istanbul/Turkey Onsite CCDE Training – 50% OFF until Sep-15, 2017 appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

Docker Networking Tip – Load balancing options in Docker

I had promised earlier that I will continue my Docker Networking Tip series. This is second in that series. The first one on Macvlan driver can be found here. In this presentation, I have covered different load balance options with Docker. Following topics are covered in this presentation: Overview of Service Discovery and Load balancing … Continue reading Docker Networking Tip – Load balancing options in Docker →

Change VM Hardware Version

The VM hardware version designates the virtual hardware functions supported by a virtual machine, which relates to the hardware on the host server. A VMware product will not be able to power on a VM with a hardware version higher than what it supports.

SIDH in Go for quantum-resistant TLS 1.3

The Quantum Threat

SIDH in Go for quantum-resistant TLS 1.3

Most of today's cryptography is designed to be secure against an adversary with enormous amounts of computational power. This means estimating how much work certain computations (such as factoring a number, or finding a discrete logarithm) require, and choosing cryptographic parameters based on our best estimate of how much work would be required to break the system.

If it were possible to build a large-scale quantum computer, many of the problems whose difficulty we rely on for security would no longer be difficult to solve. While it remains unknown whether large-scale quantum computers are possible (see this article for a good overview), it's a sufficient risk that there's wide interest in developing quantum-resistant (or post-quantum) cryptography: cryptography that works on ordinary computers we have today, but which is secure against a possible quantum computer.

At Cloudflare, our biggest use of cryptography is TLS, which we use both for serving our customers' websites (all Cloudflare sites get free HTTPS), as well as for internal inter-datacenter communication on our backend.

In the TLS context, we want to create a secure connection between a client and a server. There are basically three cryptographic problems here:

  1. Authenticity: the server Continue reading

New Study: Understanding MANRS’ Potential for Enterprises and Service Providers

Mutually Agreed Norms for Routing Security, or MANRS, was founded with the ambitious goal of improving the security and reliability of the global Internet routing system, based on collaboration among participants and shared responsibility for Internet infrastructure. These are undoubtedly essential pillars supporting the Internet’s tremendous growth and success, but we must better articulate the incentives of contributing to global security and resilience to grow MANRS participation and reach our goals.

To do so, we engaged 451 Research to understand the attitudes and perceptions of Internet service providers and the broader enterprise community around MANRS and how it relates to their organizations. The results of the study are documented in the report: https://www.routingmanifesto.org/resources/research/.

The study results demonstrate considerable unrealized potential for MANRS, showing that enterprises are interested in security and their interest should be a strong incentive for more service providers to participate. Market education could be particularly effective in overcoming the operational inertia that many providers face.

The key points from the study are:

  • While MANRS itself is not well known by enterprises, its attributes are highly valued.
  • Enterprises have high expectations for MANRS efforts.
  • Enterprise perceptions of MANRS can translate into increased revenue for service Continue reading

Time Synchronization, Security, and Trust

Time is something that is often overlooked or taken for granted, but the accuracy and reliability of time is critical to our lives and must be protected. Time is a core concept underlying nearly all physical and virtual systems. Distributed computer systems, key to many functions inherent in our daily lives, rely on accurate and reliable time, yet we rarely stop and think about how that time is constructed and represented. Accurate and reliable time is needed to determine when an event occurs, in what order a particular sequence of events occurs, or when to schedule an event that is to occur at a particular time in the future. Finally, and of particular interest to our trust agenda here at the Internet Society, quality reliable time is required for many of the security technologies that help provide trust for the Internet. It is a vital and often overlooked part of the Internet infrastructure.

Some specific examples where accurate reliable secure time information is vital include:

  • The finance sector where there are high demands on the time synchronization of business clocks in trading systems. This is especially true in the high frequency trading where a new EU legislation called Markets Continue reading
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