Suresh Vina, Author at NetworkingNexus.net

Suresh Vina

Author Archives: Suresh Vina

AWS Transit Gateway Introduction (VI)

In the previous post, we covered VPC Peering, which is a quick and easy way to create a connection between two VPCs. We also discussed its limitations, primarily that it is non-transitive. This means if VPC 'A' is peered with VPC 'B', and VPC 'B' is peered with VPC 'C', VPC 'A' cannot communicate with VPC 'C' through VPC 'B'. Because of this, to connect multiple VPCs together, you need to create a full mesh, where every VPC has a direct peering connection to every other VPC.

This complexity (when you have many VPCs) is why, in this post, we will look at AWS Transit Gateway (TGW). A Transit Gateway is an incredibly important networking resource in AWS that solves these scaling challenges. You will see the TGW featured in many modern AWS architecture diagrams because of the flexibility and simplicity it provides.

As always, if you find this post helpful, press the ‘clap’ button. It means a lot to me and helps me know you enjoy Continue reading

AWS VPC Peering (V)

Welcome back to the AWS Networking series. So far, we have covered a wide range of foundational topics. We started with the basics of building a VPC, creating subnets, configuring route tables, and providing Internet access with an Internet Gateway and a NAT Gateway. We then looked at the difference between stateful Security Groups attached to an instance's ENI and stateless Network ACLs applied at the subnet level. Most recently, we covered how to build a hybrid network using a Site-to-Site VPN.

In this post, we will continue to expand on VPC connectivity by looking at what AWS VPC Peering is and how to configure one.

If you are completely new to AWS networking, I highly recommend checking out our introductory posts linked below. However, if you are already familiar with the basics, you can carry on with this post.

As always, if you find this post helpful, press the ‘clap’ button. Continue reading

AWS Site-to-Site VPN (IV)

So far in the AWS Networking series, we have covered VPCs, subnets, route tables, Internet Gateways, NAT Gateways, EC2 instances, Security Groups, Network ACLs, and Elastic Network Interfaces. In this post, we will look at using a Site-to-Site VPN in AWS so you can securely connect your on-premise workloads to and from your AWS environment. This is a very important aspect of AWS networking, and this is a service you will use almost always.

If you have been following the series, you can easily follow along with this post. If you just stumbled upon this post, you can still continue, assuming you are already familiar with AWS networking basics. However, if you are completely new to AWS, I highly recommend checking out the previous posts linked below.

Why Do We Need a VPN to AWS?

When we launch an instance in a public subnet with a public IP address, we have seen that we can connect to Continue reading

Palo Alto Upgrade from 10.2 to 11.2 (PA-440)

I have PA-440 in my home lab and was happily running PAN-OS 10.2.10-h9. But with the recent announcement that PAN-OS 10.2 will enter limited support from 26th August 2025, I decided it was time to upgrade. I was deciding between 11.1 and 11.2 for a while, but after reading through a few forums and discussions, I ended up choosing 11.2, specifically PAN-OS 11.2.4-h7.

Since I was already on 10.2, I could upgrade directly to 11.2 without going through any intermediate versions. As per the upgrade guide, all I had to do was download the 11.2.0 base image, then download and install 11.2.4-h7.

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Just to clarify, you only need to download the 11.2.0 base image, there’s no need to install it.

After downloading both the base image and the target image, just click 'Install' on the target image. As usual, make sure to take a backup before starting. If you’re running in HA, you can upgrade the firewalls one at a time without any downtime.

The whole process took about 10 to 15 minutes, and now I'm running 11.2.4-h7. If I come across any issues, I'll be sure to update this post.

Site-to-site VPN between AWS and Palo Alto (Static & BGP)

In this blog post, we'll look at how to create a site-to-site VPN between AWS and a Palo Alto firewall. We'll go through both static routing and BGP options. This post assumes you're already somewhat familiar with AWS and Palo Alto, so we won't cover the basics like creating a VPC in AWS or setting up zones and policies on the firewall.

Overview

To create a VPN connection, you first need a compatible IPsec VPN device, like a firewall or router, at your on-premise location. In AWS, the resource you create to represent this device is called a Customer Gateway. In our example, the customer gateway is the Palo Alto firewall.

To send traffic from your VPC to your on-premise network, you route it to a Virtual Private Gateway (VGW). The VGW is a logical, redundant resource on the AWS side of the connection that you attach to your VPC. It serves as the target in your Continue reading

AWS Security Groups, NACL and ENI

This is the third blog post in the AWS Networking series. If you have been following along, you can continue with the lab we have built so far. For anyone who has just landed on this page, you can still follow along as long as you are already familiar with the basics of AWS networking. If you are completely new, however, I highly recommend checking out the introductory posts linked below to get up to speed.

In this blog post, we will look at AWS Security Groups, Network ACL (NACL) and Elastic Network Interfaces (ENI).

AWS Security Groups

So far, we have briefly touched on Security Continue reading

AWS NAT Gateway and Private/Public Subnets

When working with AWS networking, you will often hear the terms 'public subnet' and 'private subnet'. However, if you go into the AWS console to create a subnet, you won't find any option to explicitly make it one or the other. So, what exactly makes a subnet public or private?

In this blog post, we will look at the differences between public and private subnets, see how they are defined by their routing, and understand how the AWS NAT Gateway fits into this architecture.

If you are completely new to AWS networking and want to learn the basics of setting up a VPC, feel free to check out my previous post linked below.

Public vs Private Subnets

The key difference between a 'public' and a 'private' subnet is simply its route to the Internet. It is not an inherent setting of the subnet itself, but a behaviour defined by the route table associated Continue reading

Palo Alto Create Bulk Address Objects using Pan-OS Python SDK

In this blog post, we'll see how to configure bulk Address-Objects at once and then add them to an Address-Group using the pan-os-python Library. If you haven't used the pan-os-python library before, have a look at my other blog post to learn more.

Methods we will use

Here is the official guide for the useful methods

add() - This method is used to add an object as a child of another object. In our scenario, it's for adding an Address Object to the firewall or panorama object.
extend() - This method allows you to add a list of objects as children. In our context, it means adding a 'list' of Address objects to the firewall or panorama object.
create() - Once you've defined an object in the script, the create() method is used to push this object to the live device, making the configuration active.
create_similar() - This method pushes objects of the same type to the live Continue reading

Getting Started with the Pytest Plugin for Infrahub

We all write code, but how do we know the changes we make in the future won’t break something that used to work? That’s where testing becomes important.

The idea is to catch problems early, ideally before they reach production. In the Python world, one of the most common ways to do this is with a tool called pytest. It lets you write tests to check that your code behaves the way you expect and helps you catch issues before they become a bigger problem.

Originally published under - https://www.opsmill.com/pytest-plugin-infrahub/

When working with Infrahub, testing is just as important. You might want to make sure your GraphQL queries are valid, your Jinja2 templates render correctly, or your transformations behave as expected.

Infrahub simplifies this by offering a pytest plugin that doesn’t require Python code; you define tests using plain YAML. This makes testing more accessible to teams across roles and speeds up the feedback loop during development.

These kinds of unit tests aren’t just about convenience, they help establish a production-ready automation system. With automated checks built into your process, every change is validated consistently, reducing the chance of something breaking unexpectedly. That consistency builds trust when your Continue reading

UGreen NASync DXP2800 Review and First Impressions

TL;DR - For anyone who doesn’t want to go through the full post, here’s the short version. I bought the UGreen NASync DXP2800 (2 bay) from Amazon for £249 and paired it with two Seagate Ironwolf 8TB HDDs, around £180 each.

The unit comes with an Intel N100 CPU, 8GB of RAM (upgradeable to 16GB, but there’s only one RAM slot), and a 2.5Gb/s LAN port. It has a solid build, was easy to set up, and I actually like the UI. Sure, it lacks a lot of features compared to Synology or QNAP, but since I’m mainly using it for file storage, I’m happy with the purchase.

But Why UGreen NAS?

The short answer is, this is the best bang for the buck. For £249, I’m getting a 2-bay NAS with an N100 CPU, 8GB of RAM, a 2.5Gb/s LAN port, and two NVMe slots.

I’ve been wanting to buy a NAS for over Continue reading

Juniper vJunos-router in Containerlab

If you follow me or read my blog, you probably know I'm a big advocate of Containerlab. I've been using it for over two years now and I absolutely love it. Why? Because it's open source, it has an amazing community behind it (thank you again, Roman), and labs are defined using simple YAML files that are easy to share and reuse.

So far, I've used Cisco IOL, Arista EOS, and Palo Alto VM in Containerlab. And finally, the time came to try Juniper. I decided to test the Juniper vJunos-router, which is a virtualized MX router. It's a single-VM version of vMX that doesn't require any feature licenses and is meant for lab or testing purposes. You can even download the image directly from Juniper's website without needing an account. Thank you, Juniper and Cisco, please take note. In this post, I'll show you how to run Juniper vJunos-router in Containerlab.

Prerequisites

This post assumes you're somewhat familiar with Containerlab and already have it installed. If you're new, feel free to check out my introductory blog below. Containerlab also has great documentation on how to use vJunos-router, so be sure to check that out as well.

Containerlab - Creating Continue reading

My Experience at AutoCon3

This is my second time attending the AutoCon event. The first one I went to was last year in Amsterdam (AutoCon1), and it was absolutely amazing. I decided to attend again this year, and AutoCon3 took place from the 26th to the 30th of May. The first two days were dedicated to workshops, and the conference itself ran from the 28th to the 30th. I only attended the conference. I heard there were around 650 attendees at this event, which is great to see.

Network Automation Forum (NAF)

In case you’ve never heard of AutoCon, it’s a community-driven conference focused on network automation, organized by the Network Automation Forum (NAF). NAF brings together people from across the industry to share ideas, tools, and best practices around automation, orchestration, and observability in networking.

They typically hold two conferences each year, one in Europe and one in the USA, or at least that’s how it’s been so far. The European event is usually around the end of May, and the US one takes place around November. Tickets are released in tiers, with early bird pricing being cheaper. I grabbed the early bird ticket for 299 euros as soon as it was announced.

Continue reading

Configuring VLANs on UniFi Switches

I’ve worked with Cisco, Arista, and Juniper switches most of my life, but when I first started using UniFi switches in my homelab, I found myself a bit confused. The way VLANs are configured on UniFi switches is slightly different from what I was used to. In this post, I’ll go through how to configure VLANs on UniFi switches, specifically focusing on the USW-Pro-Max-16 and USW-Lite-8 models.

Quick Recap on VLANs

VLAN stands for Virtual LAN, and it's a way to logically segment a network, even if all devices are connected to the same physical switch. Different vendors use slightly different terms when it comes to VLAN port types. For example, Cisco calls them access and trunk ports, while others might refer to them as untagged and tagged ports.

An untagged (or access) port is typically used to connect end devices like PCs or printers. These devices have no awareness of VLANs, they just send regular Ethernet frames. When the switch receives a frame on an access port, it tags it with the VLAN configured for that port before forwarding it internally or out via a trunk port.

Tagged (or trunk) ports are used between switches or to other Continue reading

Creating, Modifying, and Deleting Data in Infrahub Using the Python SDK

The Infrahub Python SDK allows you to interact with Infrahub programmatically and can be used to query, create, modify, and delete data. In a previous blog post, we looked at how to query data using the Python SDK and explored various examples, including filters, relationships, and how to retrieve related data.

Originally published under - https://www.opsmill.com/infrahub-python-sdk-create-modify-delete/

In this post, we’ll focus on how to create, modify, delete and upsert data using the SDK. We’ll walk through practical examples that show how to add new resources, update existing ones, and delete data from Infrahub.

Throughout this post, we’ll be using the Infrahub sandbox, which is freely available. The sandbox already has some data in it, so if you’d like to follow along or try this yourself, you can use it without needing to set up anything.

Initial Setup

In the previous post, we covered the basics of using the Python SDK, including how to install it and set up the client object. If you’re new to the SDK, I recommend going back to that first article to start from the install.

To get started today, I’ve generated an API token on the Infrahub demo instance Continue reading

Querying Data in Infrahub via the Python SDK

Infrahub provides multiple ways to interact with your infrastructure data, including the Web GUI, GraphQL queries, and the Python SDK. These can be used to query, modify, create, or delete data in Infrahub. In this post, we’ll focus on using the Python SDK to query data from Infrahub.

This post assumes you are familiar with basic Python and Infrahub. If you’re new to these topics, don’t worry, you can still follow along.

Throughout this post, we’ll be using the Always-On Infrahub demo instance, which is available for anyone to access via this link. The demo instance already has some data in it, so if you’d like to follow along or try this yourself, you can use it without needing to set up anything.

Originally published under - https://www.opsmill.com/querying-data-in-infrahub-via-the-python-sdk/

Introduction

The Python SDK supports both synchronous and asynchronous Python. However, in this post, we’ll focus on using synchronous Python, which I hope most of us are comfortable with. We’ll cover async in a future blog post.

Interacting with Infrahub through the Python SDK is done using a client object, which defines the Infrahub instance you’ll be working with. This client acts as the connection point, allowing you to Continue reading

Tailscale VPN – A Network Engineer’s Perspective

Before we get into what Tailscale is or how it compares to a traditional remote access VPN, let’s take a quick look at Tailscale in action. The main problem Tailscale solves is remote access to your internal workloads.

In my homelab, I have a server running Linux. When I’m on my home network, I can access it directly without any issues. But if I step outside and want to access the same server over the Internet, Tailscale makes that much easier and you can have it up and running in about 10 minutes for free.

Typically, you would set up some kind of a VPN, either running on a server or a dedicated firewall. Then, you’d install a VPN client on the devices and point them to the public IP of your VPN server or firewall. That’s exactly what I have at the moment.

Tailscale takes a completely different approach, and you don’t need any of that. I’m not saying one is better than the other, I’m just pointing this out for comparison. I’ve shared my thoughts on the pros and cons of each solution at the end of this post.

Tailscale Installation and Setup

Head over to the Tailscale Continue reading

Docker Series – Networking and IP Addresses

It’s a bit embarrassing as a Network Engineer that we’ve made it this far into the Docker series without looking into Docker Networking and IP Addresses. So, in this part of the series, let’s take a quick look at the basics of Docker Networking. There’s a lot more to Docker networking than what we’ll cover here, but this should be enough to get most people started. We can always explore advanced topics in future posts.

If you haven’t been following the Docker series and just landed on this post, don’t worry; you can still follow along without any issues. If you’re curious about the previous posts, feel free to check them out below.

As always, if you find this post helpful, press the ‘clap’ button. It means a lot to me and helps me know you enjoy this type of content.

Docker Networking Basics

Container networking refers to the ability for containers to connect to and communicate with each other or Continue reading

Palo Alto Automated Scheduled Configuration Backup

I'm writing this in February 2025, and as far as I know, Palo Alto firewalls (not Panorama) don’t have a built-in mechanism for automatic configuration backups. Panorama, on the other hand, supports scheduled backups and allows you to send them to various locations like an SCP or FTP server. I’m not sure why this feature isn’t available on standalone firewalls, but in any case, let’s look at how you can use the API to periodically fetch the configuration from the Palo Alto firewall.

As always, if you find this post helpful, press the ‘clap’ button. It means a lot to me and helps me know you enjoy this type of content.

Overview

The Palo Alto KB article explains how to use the XML API with cURL to fetch the configuration and then use a cron job to run it periodically. This method works, but I want to make some tweaks to ensure we have Continue reading

Palo Alto Clientless VPN Configuration

As the title suggests, Palo Alto's clientless VPN allows users to access internal resources (HTTPS-based) without installing the GlobalProtect client. This is useful when you have an internal application that external contractors need to use, but they may not want to install a VPN client. All they need to do is open a browser, log in to your GlobalProtect portal, and access the applications directly. In this blog post, we'll go through the steps to configure Palo Alto Clientless VPN.

As always, if you find this post helpful, press the ‘clap’ button. It means a lot to me and helps me know you enjoy this type of content.

Overview

GlobalProtect Clientless VPN lets users securely access internal web applications from a browser without installing the GlobalProtect client. This is helpful for providing partners or contractors with access to specific internal applications. You can set up the GlobalProtect portal landing page to give users direct access to these applications.

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Clientless VPN acts as a reverse proxy, intercepting and modifying web pages from internal applications before presenting them to remote users. When users access these URLs, their requests pass through the GlobalProtect portal.

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Before proceeding, Continue reading

Python Getters, Setters and @property Decorator

When I first started working with Python classes, some of the most confusing topics were getters, setters, and @property. There are plenty of tutorials on how to use them, but very few actually explain why do we need them or what problem do they solve. So, I thought I’d write a dedicated post covering what they are and the problems they solve. Let’s get to it.

As always, if you find this post helpful, press the ‘clap’ button. It means a lot to me and helps me know you enjoy this type of content.

Python Classes

Before diving in, let's have a quick look at a Python class. Here’s a simple example of a Person class with two attributes name and age.

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

I'm going to create an instance of the class called p1, passing Continue reading

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