Tale From The Trenches: The Debug Of Damocles
My good friend and colleague Rich Stroffolino (@MrAnthropology) is collecting Tales from the Trenches about times when we did things that we didn’t expect to cause problems. I wanted to share one of my own here about the time I knocked a school offline with a debug command.
I Got Your Number
The setup for this is pretty simple. I was deploying a CallManager setup for a multi-site school system deployment. I was using local gateways at every site to hook up fax lines and fire alarms with FXS/FXO ports for those systems to dial out. Everything else got backhauled to a voice gateway at the high school with a PRI running MGCP.
I was trying to figure out why the station IDs that were being send by the sites weren’t going out over caller ID. Everything was showing up as the high school number. I needed to figure out what was being sent. I was at the middle school location across town and trying to debug via telnet. I logged into the router and figured I would make a change, dial my cell phone from the VoIP phone next to me, and see what happened. Simple troubleshooting, Continue reading
Announcing the Internet Society’s New President and Chief Executive Officer
Today is an exciting day for the Internet Society. It gives me great pleasure to announce, on behalf of the Internet Society’s Board of Trustees, that Andrew Sullivan has been selected as the Internet Society’s new President and Chief Executive Officer (CEO). He will formally take up his position on September 1, 2018.
This selection now successfully concludes the CEO search process we began last November.
The CEO selection process involved extensive work on the part of the Board but gave us much food for thought. We received a wealth of extremely impressive applications from more than a hundred internal and external candidates covering a huge range of talent and experience. We had some thought-provoking conversations as part of the process and I would like to express my sincere appreciation to everybody who applied for the position.
I believe Andrew’s success in being selected for this crucial role represents an enormous opportunity for the Internet Society and the global Internet.
Andrew brings a wealth of Internet industry and technology experience with him. He has served in a number of past roles, including time at Dyn, now a Global Business Unit of the Oracle Corporation, managing Domain Name System (DNS) development Continue reading
SD-WAN is Happening in India, Fast
Following the precedent set by other modern technologies in India, SD-WAN will render MPLS obsolete before it even gets a foothold.
Short Take – Culture and Technology
In today’s Network Collective Short Take, Russ White discusses his take on the intersection of culture and technology.
Russ White
The post Short Take – Culture and Technology appeared first on Network Collective.
Cryptocurrency API Gateway using Typescript+Workers
If you followed part one, I have an environment setup where I can write Typescript with tests and deploy to the Cloudflare Edge with npm run upload. For this post, I want to take one of the Worker Recipes further.
I'm going to build a mini HTTP request routing and handling framework, then use it to build a gateway to multiple cryptocurrency API providers. My point here is that in a single file, with no dependencies, you can quickly build pretty sophisticated logic and deploy fast and easily to the Edge. Furthermore, using modern Typescript with async/await and the rich type structure, you also write clean, async code.
OK, here we go...
My API will look like this:
| Verb | Path | Description |
|---|---|---|
| GET | /api/ping |
Check the Worker is up |
| GET | /api/all/spot/:symbol |
Aggregate the responses from all our configured gateways |
| GET | /api/race/spot/:symbol |
Return the response of the provider who responds fastest |
| GET | /api/direct/:exchange/spot/:symbol |
Pass through the request to the gateway. E.g. gdax or bitfinex |
The Framework
OK, this is Typescript, I get interfaces and I'm going to use them. Here's my ultra-mini-http-routing framework definition:
export interface IRouter {
route(req: RequestContextBase): IRouteHandler;
}
/**
* A route
*/
export interface IRoute Continue readingList of EVPN and DC-related IETF drafts (as of 1H 2018)
Ethernet Virtual Private Network (EVPN) solution is becoming pervasive for Network Virtualization Overlay (NVO) services in data center (DC) networks and as the next generation VPN services in service provider (SP) networks. As a result of this popularity a lot of work is going on in IETF in this area. In this post I collect links to some of the interesting IETF drafts in this area.
All this information is relevant for 1H 2018 timeframe. Keep in mind to pay attention to which version of draft you’re reading – this drafts are frequently updated.
Service Chaining using Virtual Networks with BGP VPNs
This document describes how service function chains (SFC) can be applied to traffic flows using routing in a virtual (overlay) network to steer traffic between service nodes. Chains can include services running in routers, on physical appliances or in virtual machines. Two techniques are described: in one the service chain is implemented as a sequence of distinct VPNs between sets of service nodes that apply each service function; in the other, the routes within a VPN are modified through the use of special route targets and modified next-hop resolution to achieve the desired result.
Telecom Policy: What the US Can Learn from the EU
As telecom operators roll out 5G, the US should steer clear of the heavy-handed regulation like that of the EU in order to ensure all citizens gain access to the speedier mobile technology.
MTU and TCP MSS
The largest chunk of bytes that a transport protocol can forward across specific medium is called MTU – Maximum Transmission Unit. If we speak about Ethernet, which is today the most common, he has by default 1522 bytes MTU. The story about MTU is that the MTU of specific protocol basically defines how much payload (or highest protocols headers + their payload) it can carry in its biggest packet, not counting his own headers. Putting more payload into single packet than the MTU allows will result in fragmentation, the process of slicing the frame into more smaller frames so that
The post MTU and TCP MSS appeared first on How Does Internet Work.
Viptela SDWAN Overview
High level overview of the Viptela SDWAN solution.Viptela SDWAN Overview
Viptela is an SDWAN company that was recently purchased by Cisco. In this post I will go over the components that make up the Viptela secure extensible network (SEN) solution. By the end of this post you will have a good idea of the pieces that make up the Viptela puzzle. Network...Bharti Airtel’s Chairman Sees 5G Slicing as a Solution to Net Neutrality Debate
He promised on behalf of the “mobile operator fraternity” that they will never throttle speeds.
OpenStack Summit Vancouver recap: What we did and what’s next
A few weeks ago, I set out to the beautiful city of Vancouver’s convention center, along with a boatload of rocket turtles and a stellar team. It was a great time with a wonderful scenic view of the ocean. I’ve been at Cumulus a few months now, but I can’t help but enjoy looking around, seeing the friends I’ve made in the industry, and the friends and companies Cumulus has worked with over the years. It is exciting to have thousands of people coming together at OpenStack Summit Vancouver to work on a shared goal.
This year, we were lucky enough to have our very own Pete Lumbis take the stage with David Iles of Mellanox to present our joint solution around the latest SDN revolution, which is centered on creating efficient virtualized data center networks using VXLAN & EVPN.
In the next few paragraphs, I’ll share some highlights of the event, some photos, and a recap of that exact discussion. There was a lot to learn and discover, and I’m excited to share the details.
Day 1: Don’t you just love working with collaborative open source projects?
On our first day, lots of things were going on — we Continue reading
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