Tunnels Between Clouds

I see more and more organizations deploying workloads across different clouds, and some times those workloads need to communicate between each other. There are multiple options to connect clouds together, the cheapest being an encrypted network tunnel over the public Internet, also known as IPsec VPN. All clouds support deploying your favorite network vendor as … Continue reading Tunnels Between Clouds

Where do I put my SDWAN?

You might have come across a post from my good friend Adam on SDWAN Design options in Azure, where he details seven design alternatives when incorporating SDWAN to an Azure network. While I was reading Adam’s great summary, I was wondering whether I could summarize his design options and recommendations using the 3-tier cloud netowrk … Continue reading Where do I put my SDWAN?

Where does AAD App Proxy fit with other Azure reverse proxies?

One of the best kept secrets in Azure is Azure Active Directory (AAD) Application Proxy. When exposing web applications running in Azure or on-premises, we all tend to look at services such as Azure Front Door or Azure Application Gateway, but this little gem can make the life of a network administrator so much simpler. … Continue reading Where does AAD App Proxy fit with other Azure reverse proxies?

Azure Route Server: to encap or not to encap, that is the question

Azure Route Server is a very powerful tool that thas been recently brought to the Azure Networking toolset: it offers a BGP API so that virtual machines can communicate with a VNet to learn and advertise routes. I have written some articles about Route Server in the past on how to achieve certain scenarios, but … Continue reading Azure Route Server: to encap or not to encap, that is the question

ExpressRoute Global Reach under the covers

After some questions in my previous blog post CLI-based analysis of an ExpressRoute private peering I decided to write an addition that includes what Expressroute Global Reach looks like for the CLI lover. In essence, Global Reach allows to use Microsoft’s backbone network for onprem-to-onprem communication. But how does it do it exactly? I have … Continue reading ExpressRoute Global Reach under the covers

What language does the Azure Gateway Load Balancer speak?

As you might have read, one of the new kids on the block in Azure Networking is the Gateway Load Balancer. You can refer to Microsoft docs for more details on what it does and why it was created, suffice to say that it is essentially a way to insert an NVA in a network … Continue reading What language does the Azure Gateway Load Balancer speak?

Multi-region design with Azure Route Server without an overlay

Some time ago I posted a blog commenting on a possible design for interconnecting multiple Azure regions by means of Network Virtual Appliances (NVAs) and the Azure Route Server (ARS), where I used an overlay tunnel between the NVAs with VXLAN as encap protocol. I have received multiple questions to whether it would be possible … Continue reading Multi-region design with Azure Route Server without an overlay

Test like a champ with Azure Connection Monitor

If you work in Azure, you probably know about Connection Monitor, a tool that generates synthetic traffic to test connectivity and measure response times. You configure sources (Virtual Machines) to generate traffic that can be addressed to destinations such as other Virtual Machines or any external endpoint outside of Azure. Alerts can be automatically generated … Continue reading Test like a champ with Azure Connection Monitor

CLI-based analysis of an ExpressRoute private peering

Quite frequently I see Azure connectivity diagrams that do not reflect accurately the topology of Azure Virtual Networks connnected to on-premises data centers via ExpressRoute. Additionally, I got the question last week of how to do some basic BGP troubleshooting in the involved networking devices in a way which is understandable by network administrators (read … Continue reading CLI-based analysis of an ExpressRoute private peering

VNet peering settings, those familiar strangers

Hey everybody! In this post I would like to talk about some of the settings that you can configure in VNet Peerings, and how those actually work. Even if you have been using VNet peerings for years now, I bet I have some surprises for you. TL;DR: Do not rely in the VirtualNetwork service tag … Continue reading VNet peering settings, those familiar strangers