Video: Using Simple PowerShell Scripts

After explaining the basics of PowerShell, Mitja Robas described how to do implement the “Hello, World!” of network automation (collecting printouts from network devices) in PowerShell.

To watch all videos from this free webinar, register here.

Load Balancers Comparisons: F5 Vs KEMP Vs Citrix

Using Telegraf, InfluxDB and Grafana to Monitor Network Statistics

Two years ago I wrote about how to use InfluxDB & Grafana for better visualization of network statistics. I still loathe MRTG graphs, but configuring InfluxSNMP was a bit of a pain. Luckily it’s now much easier to collect SNMP data using Telegraf. InfluxDB and Grafana have also improved a lot. Read on for details about to monitor network interface statistics using Telegraf, InfluxDB and Grafana.

Background - Telegraf, InfluxDB + Grafana

There’s three parts to this:

• Grafana: Grafana is “The open platform for beautiful analytics and monitoring.” It makes it easy to create dashboards for displaying data from many sources, particularly time-series data. It works with several different data sources such as Graphite, Elasticsearch, InfluxDB, and OpenTSDB. We’re going to use this as our main front end for visualising our network statistics.

• InfluxDB: InfluxDB is “…a data store for any use case involving large amounts of timestamped data.” This is where we we’re going to store our network statistics. It is designed for exactly this use-case, where metrics are collected over time.

• Telegraf: Telegraf is “…a plugin-driven server agent for collecting and reporting metrics.” This can collect data from a wide variety of sources, Continue reading

Complexity Isn’t Always Bad

I was reading a great post this week from Gian Paolo Boarina (@GP_Ifconfig) about complexity in networking. He raises some great points about the overall complexity of systems and how we can never really reduce it, just move or hide it. And it made me think about complexity in general. Why are we against complex systems?

Confusion and Delay

Complexity is difficult. The more complicated we make something the more likely we are to have issues with it. Reducing complexity makes everything easier, or at least appears to do so. My favorite non-tech example of this is the carburetor of an internal combustion engine.

Carburetors are wonderful devices that are necessary for the operation of the engine. And they are very complicated indeed. A minor mistake in configuring the spray pattern of the jets or the alignment of them can cause your engine to fail to work at all. However, when you spend the time to learn how to work with one properly, you can make the engine perform even above the normal specifications.

Carburetors have been largely replaced in modern engines by computerized fuel injectors. These systems accomplish the same goal of injecting the fuel-air mixture into Continue reading

Show 367: Silver Peak & The Maturing Of SD-WAN (Sponsored)

When It Comes to Smart Toys, It Pays to Shop Smart

When your in-laws give your child a loud toy for the holidays, you know you are going to have to hear it for the next few months. But when that toy connects to the Internet, how can you be sure that you’re the only ones listening?

This holiday season, “smart toys” (Internet or Bluetooth-enabled toys) are some of the most popular toys on the market. A lot of these toys look awesome, including:

• remote control cars that connect with an app and allow you to race against AI controlled cars;
• stuffed animals that play back messages sent from loved one’s smartphones; and
• soccer balls that track your form when you kick them.

Smart toys come with fantastic features, but if left unsecured, smart toys can present a serious privacy risk to those who use them. For instance:

• Hackers could gather the personal messages recorded to play through a grandchild’s teddy bear;
• Strangers could send messages to nearby children by using a toy robot’s Bluetooth feature – putting their safety at risk; and
• Toy companies could use a toy’s microphones not only for voice commands, but to also collect personal information to sell to third parties.

Unsecured smart toys present Continue reading

Introduction to OSPF NSSA Area

Promoting the African Internet Economy, an opportunity that cannot be missed

Some time ago, a European who visited my country and saw all the potential it possesses asked me “why is your country poor?”. It was a compelling question that made me think for years. It is true that there are external reasons such as the acts of colonial and other powers who have done everything to block economic progress. But, I have to admit, there is at least one major internal reason: we missed many opportunities for development.

We missed the industrial revolution of the 19th century that propelled Japan and many European countries to development. We missed the development opportunity that many South East Asian countries grabbed since the 1960s. We missed many other opportunities, simply because we didn’t realize they were there or we just could not agree on how to make the best out of them.

The African Union has a very clear vision to transform the socio-economic condition of the continent by 2063; by this year, the Union will be celebrating its hundredth anniversary (see Agenda 2063). This is a great vision. But, is Africa ready to use the opportunities that exist today and can enable it to arrive to its aspirations enshrined in Continue reading

Worth Reading: Designing Container Networking

Diane Patton (Cumulus Networks) published a short overview of container networking design options, from traditional MLAG to running Quagga on Docker host.

If you want to learn more about individual designs described in that blog post, watch the Leaf-and-Spine Fabric Architectures and Docker Networking webinars, or join one of the data center online courses.

Basic Configuration for Cisco ASA 5505 Interfaces- Trunk Port

Today I am going to talk about the basic Cisco ASA configuration of trunk ports and also to make that Cisco asa with the failover link. We are putting two ASA where one is the primary one and another is the failover ASA in the DMZ zone. I already discuss on the Cisco ASA access port configurations. If you want to have a look on the configurations, please go through the below link as a reference
Basic Configuration for Cisco ASA 5505 Interfaces- Access Ports

Before we talk about these protocols,  I would like to tell you guys that we have our own youtube channel for various network videos that can further help you guys to study further. I will going to add many more videos soon on the channel, Please subscribe to the channel for the study network related videos

Subscribe us on Youtube: http://y2u.be/0c4lMYVp9go

Now let's talk about the basic Cisco ASA configuration for the trunk port. Below is the basic topology showing the Cisco ASA placed in the enterprise network. The configurations, IP addresses and topology shown here is only for the demo purposes and has no relevance with any of the enterprise networks.

Fig 1.1- Continue reading

Basic Configuration for Cisco ASA 5505 Interfaces- Access Ports

Today I am going to talk about the basic Cisco ASA configuration on the access ports and also to make that Cisco asa with the failover link. Later on i will come up with the configuration part of the Cisco asa with the trunk port configurations. We are putting two ASA where one is the primary one and another is the failover ASA in the DMZ zone.

Before we talk about these protocols,  I would like to tell you guys that we have our own youtube channel for various network videos that can further help you guys to study further. I will going to add many more videos soon on the channel, Please subscribe to the channel for the study network related videos

Subscribe us on Youtube: http://y2u.be/0c4lMYVp9go

Lets talk about the Cisco ASA configurations where we configures five VLAN interfaces, including the failover interface which is configured using the failover lan command. 

Fig 1.1- Cisco ASA 5505

Configuration Examples for ASA 5505 Interfaces

Here in the below example, we are taking VLAN 2, VLAN 3, VLAN 4 and VLAN 5 where VLAN 6 will be the failover link and after that all VLANs will be assigned to the Continue reading

The New DDoS Landscape

News outlets and blogs will frequently compare DDoS attacks by the volume of traffic that a victim receives. Surely this makes some sense, right? The greater the volume of traffic a victim receives, the harder to mitigate an attack - right?

At least, this is how things used to work. An attacker would gain capacity and then use that capacity to launch an attack. With enough capacity, an attack would overwhelm the victim's network hardware with junk traffic such that they can no longer serve legitimate requests. If your web traffic is served by a server with a 100 Gbps port and someone sends you 200 Gbps, your network will be saturated and the website will be unavailable.

Recently, this dynamic has shifted as attackers have gotten far more sophisticated. The practical realities of the modern Internet have increased the amount of effort required to clog up the network capacity of a DDoS victim - attackers have noticed this and are now choosing to perform attacks higher up the network stack.

In recent months, Cloudflare has seen a dramatic reduction in simple attempts to flood our network with junk traffic. Whilst we continue to see large network level attacks, in Continue reading

Want to try Warp? We just enabled the beta for you

Tomorrow is Thanksgiving in the United States. It’s a holiday for getting together with family characterized by turkey dinner and whatever it is that happens in American football. While celebrating with family is great, if you use a computer for your main line of work, sometimes the conversation turns to how to setup the home wifi or can Russia really use Facebook to hack the US election. Just in case you’re a geek who finds yourself in that position this week, we wanted to give you something to play with. To that end, we’re opening the Warp beta to all Cloudflare users. Feel free to tell your family there’s been an important technical development you need to attend to immediately and enjoy!

Hello Warp! Getting Started

Warp allows you to expose a locally running web server to the internet without having to open up ports in the firewall or even needing a public IP address. Warp connects a web server directly to the Cloudflare network where Cloudflare acts as your web server’s network gateway. Every request reaching your origin must travel to the Cloudflare network where you can apply rate limits, access policies and authentication before the request hits your Continue reading

OpenStack SDN – NFV Management and Orchestration

In the ongoing hysteria surrounding all things SDN, one important thing gets often overlooked. You don’t build SDN for its own sake. SDN is just a little cog in a big machine called “cloud”. To take it even further, I would argue that the best SDN solution is the one that you don’t know even exists. Despite what the big vendors tell you, operators are not supposed to interact with SDN interface, be it GUI or CLI. If you dig up some of the earliest presentation about Cisco ACI, when the people talking about it were the actual people who designed the product, you’ll notice one common motif being repeated over and over again. That is that ACI was never designed for direct human interaction, but rather was supposed to be configured by a higher level orchestrating system. In data center environments such orchestrating system may glue together services of virtualization layer and SDN layer to provide a seamless “cloud” experience to the end users. The focus of this post will be one incarnation of such orchestration system, specific to SP/Telco world, commonly known as NFV MANO.

NFV MANO for Telco SDN

At the early dawn of SDN/NFV era a Continue reading

Pseudo-wires With Vagrant and Libvirt

Pseudo-wires With Vagrant and Libvirt

Openstack SDN – NFV Management and Orchestration

In this post I’ll have a brief look at the NFV MANO framework developed by ETSI and create a simple vIDS network service using Tacker.

The Internet Society and NetBlocks Team up to Keep it on!

By Constance Bommelaer de Leusse and Alp Toker

How much do government shutdowns cost? How do they impact growth and prosperity?

In 2016 Internet shutdowns cost globally about $2.4 billion USD, and across 10 African countries they led to loss of $237 million USD over 236 days.

If we don’t act now, shutdowns and restrictions of access will continue to rise and the economic cost will increase over the next few years. At a time where developing countries can benefit the most from Internet access for economic growth, education and health, we cannot let this situation become the new normal.

The economic rationale of keeping it on

The impact of shutdowns on freedom of expression and human rights is already well understood. Unfortunately, this has little effect in reversing the trend. This is why we need the ear of economic and trade Ministers, investors, development banks, and others who can ensure the Internet isn’t shut down. Because they care about the growth and prosperity the Internet can bring.

Today we are excited to announce that the Internet Society and NetBlocks are teaming up to develop a tool to better measure the cost of shutdowns, and convince governments to keep the Continue reading

Holiday Weekend Reads (22nov17)

The coming holiday is cutting my publishing schedule short, but I didn’t want to leave too many interesting stories on the cutting room floor. Hence the weekend read comes early this week, and contains a lot more stuff to keep you busy for those couple of extra days. For the long weekend, I have five on security and one on culture. Enjoy!

This first read is about the US government’s collection and maintenance of security vulnerabilities. This is always a tricky topic; if a government knows about security vulnerabilities, there is at least some chance some “bad actor” will, as well. While the government might want to hoard such knowledge, in order to be more effective at breaking into systems, there is at least some possibility that refusing to release information about the vulnerabilities could lead to them not being fixed, and therefore to various systems being comrpomised, resulting in damage to real lives. The US government appears to be rethinking their use and disclosure of vulnerabilities

There can be no doubt that America faces significant risk to our national security and public safety from cyber threats. During the past 25 years, we have moved much of what we value Continue reading

Worth Reading: A Request for Clarity

The other day I was researching a product for a blog I was writing. After twenty or so minutes on the Web page, I still had no clear idea what the product did or how it worked. Like a fortune teller reading entrails, it was up to me to make sense out of a bloody mess of the marketing grizzle strewn among the bones of “intent” “automation” and “machine learning.” And then I realized that was the point. If, like a fortune, a vendor’s language is broad enough and vague enough, it can. — Drew Conry-Murray @ Packet Pushers