Category: SDN

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AVI (NSX-ALB) Quick tip for troubleshooting network connectivity!

A short conversation on how to check and troubleshoot network connectivity from AVI Service Engines.

CuriousTechie: Hello IT Guy, I am new to AVI and sometimes I get stuck in troubleshooting connectivity issues on service engines. Is there a way to check connectivity of the data nics from the service engines?

ITGuy: Sure there is a simple way! You may login to the network namespace of the data nic inside the service engine and check the connectivity.

CuriousTechie: Can you please show me how to do that? Here is my scenario!

I have NSX-T cloud with service engines running, I have created a virtual service but the Virtual Service is DOWN and the Pool is DOWN as well. Also I am not able to reach the SE data nics.

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NSX-ALB GSLB Public or Private IP??

A conversation about how to configure GSLB service to provide the appropriate Public or Private IP as per the incoming DNS request.

CuriousTechie: Hello IT Guy, I am in a planning phase for a GSLB implementation and have some doubts around the DNS services, can you help me with it.

ITGuy: Sure! I recently had a conversation around GSLB which you can find here.

CuriousTechie: Yes! I have a fair understanding of GSLB, but I am looking for some specifics around how the GSLB DNS service determines which IP (Public or Private) it provides in the DNS response for Internal and External users. Can you help me to get some clarity and show the actual configuration?

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Broke my LAB with Distributed Firewall !!!

Recently I had an interesting conversation about implementing micro-segmentation using NSX Distributed Firewall and things to be careful about while implementation.

CuriousTechie: Hey, I was implementing Micro-segmentation in my Lab using DFW and I broke the Lab. Can you check if it can be fixed or I have to rebuild from scratch again!!

ITGuy: Let’s take a look at the problem and see if we can recover from it. What did you do?

CuriousTechie: I was testing micro-segmentation and changed the default rule to reject all traffic.

ITGuy: Let me guess..! You forgot it’s a collapsed cluster and you accidently locked away your NSX manager and vCenter ?

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NSX ALB – A conversation about GSLB Basics

CuriousTechie: Hey, I am learning to setup Global Server Load Balancing on AVI. I do not have much experience on GSLB especially with AVI or NSX ALB, can you help me understand the basic concept of GSLB with NSX ALB?

ITGuy: Sure! Are you good with how GSLB works irrespective of the Load Balancer?

CuriousTechie: I know some basics, but a white board refresher will be helpful.

ITGuy: Sure! Let’s see what happens when you type a URL in your favourite web browser. You input a URL lets say “curioustechies.in”and DNS does its magic and run multiple DNS queries to find you the IP of the web site/server that you are looking for. I believe you have a fair understanding of how DNS works so will not go much deep into it. OK?

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NSX ALB Virtual Service Placement

A conversation about placement of Virtual Services on NSX ALB Service Engines

CuriousTechie: Hey IT Guy, I am starting my starting my journey with NSX ALB and I am little confused with different knobs in the Service Engine Group setting to manage the Virtual Service Placement. Can you show me around the setting to build a better understanding?

ITGuy: Yes, sure! Let’s start with some basic understanding of the knobs and then we can work on few scenarios to see how the placement works.

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