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Category: Azure

Feedback: Azure Networking

When I started developing AWS- and Azure Networking webinars, I wondered whether they would make sense – after all, you can easily find tons of training offerings focused on public cloud services.

However, it looks like most of those materials focus on developers (no wonder – they are the most significant audience), with little thought being given to the needs of network engineers… at least according to the feedback left by one of subscribers.

I have been searching online for months for any training content that go deep dive in Azure networking as we are moving to Azure currently in my company, but I didn’t find any content that explains in details the technical architectures, and all ins- and outs about Azure networking. I am so delighted that I have subscribed to Keep up the good work.
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Feedback: Microsoft Azure Networking

Azure and AWS have decent documentation (I always found it relatively easy to figure out what they’re doing), but what they implemented is sometimes so far away from what we’re used to that it’s hard to bridge the gap. Here’s how Olle Wilhelmsson solved that challenge:

I would just like to send a huge thank you, I’ve been a fan of your appearances on tech field day as a voice of reason, and different podcasts all around. Happy to finally be able to contribute and purchase an IPspace subscription, and was not disappointed.

This series on Azure networking was fantastic, it’s been frustrating to find any kind of good material on this topic. Even if Microsofts documentation is generally good, they really don’t have any resources to compare it to “regular” networking in physical equipment. So just a huge thank you, this has definitely saved me countless hours of reading and googling questions!

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Relative Speed of Public Cloud Orchestration Systems

When I was complaining about the speed (or lack thereof) of Azure orchestration system, someone replied “I tried to do $somethingComplicated on AWS and it also took forever

Following the “opinions are great, data is better” mantra (as opposed to “never let facts get in the way of a good story” supposedly practiced by some podcasters), I decided to do a short experiment: create a very similar environment with Azure and AWS.

I took simple Terraform deployment configuration for AWS and Azure. Both included a virtual network, two subnets, a route table, a packet filter, and a VM with public IP address. Here are the observed times:

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Azure Route Server: The Challenge

Imagine you decided to deploy an SD-WAN (or DMVPN) network and make an Azure region one of the sites in the new network because you already deployed some workloads in that region and would like to replace the VPN connectivity you’re using today with the new shiny expensive gadget.

Everyone told you to deploy two SD-WAN instances in the public cloud virtual network to be redundant, so this is what you deploy:

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Why Is Public Cloud Networking So Different?

A while ago (eons before AWS introduced Gateway Load Balancer) I discussed the intricacies of AWS and Azure networking with a very smart engineer working for a security appliance vendor, and he said something along the lines of “it shows these things were designed by software developers – they have no idea how networks should work.

In reality, at least some aspects of public cloud networking come closer to the original ideas of how IP and data-link layers should fit together than today’s flat earth theories, so he probably wanted to say “they make it so hard for me to insert my virtual appliance into their network.

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Renumbering Public Cloud Address Space

Got this question from one of the networking engineers “blessed” with rampant clueless-rush-to-the-cloud.

I plan to peer multiple VNet from different regions. The problem is that there is not any consistent deployment in regards to the private IP subnets used on each VNet to the point I found several of them using public IP blocks as private IP ranges. As far as I recall, in Azure we can’t re-ip the VNets as the resource will be deleted so I don’t see any other option than use NAT from offending VNet subnets to use my internal RFC1918 IPv4 range. Do you have a better idea?

The way I understand Azure, while you COULD have any address range configured as VNet CIDR block, you MUST have non-overlapping address ranges for VNet peering.

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EVPN Control Plane in Infrastructure Cloud Networking

One of my readers sent me this question (probably after stumbling upon a remark I made in the AWS Networking webinar):

You had mentioned that AWS is probably not using EVPN for their overlay control-plane because it doesn’t work for their scale. Can you elaborate please? I’m going through an EVPN PoC and curious to learn more.

It’s safe to assume AWS uses some sort of overlay virtual networking (like every other sane large-scale cloud provider). We don’t know any details; AWS never felt the need to use conferences as recruitment drives, and what little they told us at re:Invent described the system mostly from the customer perspective.

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Cloud Networking Architectures

There’s one thing no cloud vendor ever managed to change: virtual machines running on top of cloud infrastructure expect to have Ethernet interfaces.

It doesn’t matter if the virtual Ethernet Network Interface Cards (NICs) are implemented with software emulation of actual hardware (VMware emulated the ancient Novell NE1000 NIC) or with paravirtual drivers - the virtual machines expect to send and receive Ethernet frames. What happens beyond the Ethernet NIC depends on the cloud implementation details.

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Video: Public Cloud Networking Overview

Donal O Duibhir was trying to get me to present at INOG for ages, and as much as I’d love to get to Ireland we always had a scheduling conflict.

Last week we finally made it work - unfortunately only in a virtual event, so I got none of the famous Irish beer - and the video about alternate universes of public cloud networking is already online.

Maximilian Wilhelm had great fun turning my usual black-and-white statements into tweets, including:

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Stretched Layer-2 Subnets in Azure

Last Thursday morning I found this gem in my Twitter feed (courtesy of Stefan de Kooter)

Greg Cusanza in #BRK3192 just announced #Azure Extended Network, for stretching Layer 2 subnets into Azure!

As I know a little bit about how networking works within Azure, and I’ve seen something very similar a few times in the past, I was able to figure out what’s really going on behind the scenes in a few seconds… and got reminded of an old Russian joke I found somewhere on Quora:

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