netlab 1.8.4: vrnetlab Containers, Catalyst 8000v

I don’t think I ever created two netlab releases in a week, but last week, I stumbled upon a motherlode of goodies, and it would be a shame not to make them available.

Someone tried to use netlab with vrnetlab containers for CSR 1000v and Nexus 9300v. We got it to work, but when I started integrating his changes into the development branch, I wanted to test them, so I installed vrnetlab to create my own container images. vrnetlab is an excellent tool, and building containers is a breeze (running them is a different story), so I added support for vrnetlab containers for every device supported by that tool and netlab for which I happened to have a disk image.

netlab 1.8.4: vrnetlab Containers, Catalyst 8000v

I don’t think I ever created two netlab releases in a week, but last week, I stumbled upon a motherlode of goodies, and it would be a shame not to make them available.

Someone tried to use netlab with vrnetlab containers for CSR 1000v and Nexus 9300v. We got it to work, but when I started integrating his changes into the development branch, I wanted to test them, so I installed vrnetlab to create my own container images. vrnetlab is an excellent tool, and building containers is a breeze (running them is a different story), so I added support for vrnetlab containers for every device supported by that tool and netlab for which I happened to have a disk image.

Why content providers need IPv6

IPv4 is an expensive resource. However, many content providers are still IPv4-only. The most common reason is that IPv4 is here to stay and IPv6 is an additional complexity.¹ This mindset may seem selfish, but there are compelling reasons for a content provider to enable IPv6, even when they have enough IPv4 addresses available for their needs.

Why ISPs need IPv6?​

Providing a public IPv4 address to each customer is quite costly when each IP address costs US$40 on the market. For fixed access, some consumer ISPs are still providing one IPv4 address per customer.² Other ISPs provide, by default, an IPv4 address shared among several customers. For mobile access, most ISPs distribute a shared IPv4 address.

There are several methods to share an IPv4 address:³

NAT44

The customer device is given a private IPv4 address, which is translated to a public one by a service provider device. This device needs to maintain a state for each translation.

464XLAT Continue reading

Is your TLS resuming?

There are two main ways that a TLS handshake can go: Full handshake, or resume.

There are two benefits to resumption:

1. it can save a round trip between the client and server.
2. it saves CPU cost of a public key operation.

Round trip

Saving a round trip is important for latency. Some websites don’t use a CDN, so a roundtrip could take a while. And even those on a CDN can be tens of milliseconds away. Maybe won’t matter much for a human, but roundtrips can kill the performance of something that needs to do sequential connections.

E.g. Australia is far away:

$ ping -c 1 -n www.treasury.gov.au
PING treasury.gov.au (3.104.80.4) 56(84) bytes of data.
64 bytes from 3.104.80.4: icmp_seq=1 ttl=39 time=369 ms

That’s about a third of a second. Certainly noticeable to a human. Especially since rendering a web page usually requires many connections to different hosts.

For TCP based web requests (in other words: not QUIC), there’s usually four roundtrips involved (slightly simplified):

1. TCP connection establishment.
2. ClientHello & ServerHello.
3. Client & Server ChangeCipherSpec.
4. HTTP request & response.

So from the UK to Australia, that’s about Continue reading

Arista Network Test Automation (ANTA) Example

When I was at Autocon1, I visited the Arista booth and had an interesting chat with their team. They mentioned a tool called Arista Network Test Automation (ANTA), which sounded promising, and I wanted to try it out in my lab. As with anything related to automation, I always want to experiment and share my findings with my readers.

What is ANTA?

In a nutshell, if you work with Arista devices, you can use the ANTA Python library to write tests using a simple YAML declarative syntax. From a very high level, you define some tests, run them, and they either pass or fail. This straightforward approach helps you quickly verify the health and configuration of your network.

Here are some of the tests you can write.

• Checking if all your EOS devices are running a specific EOS version,
• Ensuring all BGP peers are up and running
• Verifying if you have a specific route on all or specific devices
• Verify PortChannels and Interfaces
• And many more

Here is a very simple test that checks if all my routers (6 in total) have the specified two routes in their routing tables. The test will fail if the route doesn't Continue reading

VPP with loopback-only OSPFv3 – Part 2

Introduction

When I first built IPng Networks AS8298, I decided to use OSPF as an IPv4 and IPv6 internal gateway protocol. Back in March I took a look at two slightly different ways of doing this for IPng, notably against a backdrop of conserving IPv4 addresses. As the network grows, the little point to point transit networks between routers really start adding up.

I explored two potential solutions to this problem:

1. [Babel] can use IPv6 nexthops for IPv4 destinations - which is super useful because it would allow me to retire all of the IPv4 /31 point to point networks between my routers.
2. [OSPFv3] makes it difficult to use IPv6 nexthops for IPv4 destinations, but in a discussion with the Bird Users mailinglist, we found a way: by reusing a single IPv4 loopback address on adjacent interfaces

In May I ran a modest set of two canaries, one between the two routers in my house (chbtl0 and chbtl1), and another between a router at the Daedalean colocation and Interxion datacenters (ddln0 and chgtg0). AS8298 has about quarter of a /24 tied up in these otherwise pointless point-to-point transit networks (see what Continue reading

Oracle OCI DRCC – Who, What, How? Regional Subnet – Happiness

Disclaimer: All writings and opinions are my own and are interpreted solely from my understanding. Please contact the concerned support teams for a professional opinion, as technology and features change rapidly.

Topics Discussed: DRCCs Intro and OCI Cloud Regional Subnet

Spoiler alert: This involves an on-premises cloud for customers offered by Oracle. All offerings for cloud@customer by Oracle can be viewed at https://www.oracle.com/cloud/cloud-at-customer/

Dedicate Region Cloud @Customer – DRCC

Ref: https://www.oracle.com/cloud/cloud-at-customer/dedicated-region/#rc30category-documentation

Before understanding DRCC, let’s consider the scope of improvement on customer premises with their own Data Center and what it tries to solve. Fair? Let’s imagine I have my own data centre. Great! My infrastructure supports some of my workloads, but how do I get the latest technology stack, support, and services that the public cloud offers?

For example, how can someone leverage all these services without having to invest in development cycles yet meet latency/integration/data security and multiple other requirements?

Ref: https://www.oracle.com/cloud/

Can Marvell Profit As It Tries To Triple Its Business By 2028?

A rising tide may lift all boats, and that is a good thing these days with any company that has an AI oar in the water. …

Can Marvell Profit As It Tries To Triple Its Business By 2028? was written by Timothy Prickett Morgan at The Next Platform.

MikroTik ROSv7 cheat sheets – OSPFv2/v3 LSAs

When troubleshooting OSPF in MikroTik, it’s often helpful to look at the LSAs to determine the root cause of an issue.

However, MikroTik’s LSA names don’t always match up to the language used in RFCs and other resources when trying to verify the behavior of an LSA is working as intended. This can make troubleshooting difficult.

These cheat sheets match up the lsa description for OSPFv2 and OSPFv3 in RouterOSv7 with the common LSA Type and number reference.

PDF links are listed below – hope you find this helpful!

OSPFv2

PDF: https://stubarea51.net/wp-content/uploads/2024/06/ROSv7-OSPF-Fundamentals-SA51-LSA-Types-OSPFv2.pdf

OSPFv3

PDF: https://stubarea51.net/wp-content/uploads/2024/06/ROSv7-OSPF-Fundamentals-SA51-LSA-Types-OSPFv3-1.pdf

How the UEFA Euro 2024 football games are impacting local Internet traffic

Football (“soccer” in the US) is considered the most popular sport in the world, with around 3.5 billion fans spread across the world. European football is central to its popularity. The UEFA Euro 2024 (the European Football Championship) started on June 14 and will run until July 14, 2024. But how much do these games impact Internet traffic in countries where national teams are playing? That’s what we aim to explore in this blog post. We found that, on average, traffic dropped 6% during games in European countries with national teams playing in the tournament.

Cloudflare has a global presence with data centers in over 320 cities, which helps provide a global view of what’s happening on the Internet. This is helpful for security, privacy, efficiency, and speed purposes, but also for observing Internet disruptions and traffic trends.

In the past, we’ve seen how Internet traffic and HTTP requests are impacted by events such as total solar eclipses, the Super Bowl, and elections. 2024 is the year of elections, and we’ve been sharing our observations in blog posts and our new 2024 Election Insights report on Cloudflare Radar.

However, football games are different from elections. Related trends Continue reading

rule 11 reader 2024-06-21 15:19:04

Talking at Bernstein’s 40th Annual Strategic Decision Conference late last week, HP boss Enrique Lores acknowledged the pressures facing the print division, saying the number of printed pages has dropped by a fifth.

The petition makes three general arguments for issuing a pause on net neutrality, the first of which is that the FCC may not have the authority to reinstate net neutrality at all.

Each time someone interacts with a large language model (LLM), there is an energy cost in running the model for inference. In addition, there is an energy cost in the preparation and training of the model before it was brought to production.

On December 14, 2022, the European Parliament adopted the Directive on measures for a high common level of cybersecurity across the Union (Directive (EU) 2022/2555) hereinafter referred to as “NIS2”), which was published in the official journal on December 27, 2022

In my view, Thomas’ approach is inconsistent with the remainder of Article 28 and would not achieve the goals of NIS2 to improve cybersecurity across the EU member states.

This kind of marketing, historically, is quite effective – bigger numbers are easier for us customers to understand. But, as is the case Continue reading

Hedge 231: Decoupling for Security

We often think of decoupling, or modularization in network engineering speak, as a primary tool for scaling networks, but it also one of the best tools network engineers have to increase security. In this roundtable, Eyvonne, Tom, and Russ discuss an article by Bruce Schneier on decoupling, and how it applies to networking engineering.
 

 
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