Multicast PIM Dense Mode vs PIM Sparse Mode
Multicast PIM Dense mode vs PIM Sparse mode is one of the most important things for every Network Engineer who deploys IP Multicast on their networks. Because these two design option is completely different and the resulting impact can be very high. In this post, we will look at, which situation, which one should be used, and why.
Although we will not explain PIM Dense or PIM Sparse mode in detail in this post, very briefly we will look at them and then compare them for clarity. First of all, you should just know both PIM Dense and PIM Sparse are the PIM Deployment models.
PIM Dense Mode
PIM Dense mode work based on push and prune. Multicast traffic is sent everywhere in the network where you enable PIM Dense mode.
This is not necessarily bad.
In fact, as a network designer, we don’t think there is bad technology. They have use cases
If Multicast receivers are everywhere or most of the places in the network, then pushing the traffic everywhere is not a bad thing.
Because when you push, you don’t build a shared tree, you don’t need to deal with the RP – Rendezvous Point, because Multicast Continue reading
How Does Satellite Internet Work?
The orbiting satellite transmits and receives its information to a location on Earth called the Network Operations Center (NOC). NOC is connected to the Internet so all communications made from the customer location (satellite dish) to the orbiting satellite will flow through the NOC before they reached the Internet and the return traffic from the Internet to the user will follow the same path.
How does Satellite Internet work?
Data over satellite travels at the speed of light and Light speed is 186,300 miles per second. The orbiting satellite is 22,300 miles above earth (This is true for the GEO-based satellite)
The data must travel this distance 4 times:
1. Computer to satellite
2. Satellite to NOC/Internet
3. NOC/Internet to satellite
4. Satellite to computer
Satellite Adds latency
This adds a lot of time to the communication. This time is called “Latency or Delay” and it is almost 500 milliseconds. This may not be seen so much, but some applications like financial and real-time gaming don’t like latency.
Who wants to pull a trigger, and wait for half a second for the gun to go off?
But, latency is related to which orbit the Continue reading
Tier 1 Carriers Performance Report: May, 2022
The post Tier 1 Carriers Performance Report: May, 2022 appeared first on Noction.
When You Find Yourself on Mount Stupid
The early October 2021 Facebook outage generated a predictable phenomenon – couch epidemiologists became experts in little-known Bridging the Gap Protocol (BGP), including its Introvert and Extrovert variants. Unfortunately, I also witnessed several unexpected trips to Mount Stupid by people who should have known better.
To set the record straight: everyone’s been there, and the more vocal you tend to be on social media (including mailing lists), the more probable it is that you’ll take a wrong turn and end there. What matters is how gracefully you descend and what you’ve learned on the way back.
When You Find Yourself on Mount Stupid
The early October 2021 Facebook outage generated a predictable phenomenon – couch epidemiologists became experts in little-known Bridging the Gap Protocol (BGP), including its Introvert and Extrovert variants. Unfortunately, I also witnessed several unexpected trips to Mount Stupid by people who should have known better.
To set the record straight: everyone’s been there, and the more vocal you tend to be on social media (including mailing lists), the more probable it is that you’ll take a wrong turn and end there. What matters is how gracefully you descend and what you’ve learned on the way back.
Content vs Carriage – Who Pays?
The Internet may be many things, but its definitely not free. One way or another the users of the Internet pay for the Internet. But this does not stop various players in the space jostling for relative advantage, claiming others should be paying more while they pay less. This tension is often reflected between carriage providers and content service providers when they try and figure out who should pay whom and how much.BGP RTBH – Remotely Triggered Blackholing
BGP RTBH – Remotely triggered blackholing is used for DDOS prevention for a long time by many companies. DDOS – Distributed Denial of Service Attacks have an economic impact. According to an NBC News article, More than 40% of DDOS Attacks cost $1 million per day.
Remote Triggered Blackhole is a technique that is used to mitigate DDOS attacks dynamically.
Before RTBH, customers used to call the Operator when there is an attack, Operator NOC engineers used to connect to the attacked network, trace the source of the attack, place the filters accordingly and the attack goes away.
•Manual operation is open to configuration mistakes, cannot scale in large networks, and between the attack and the required action, services stay down
There are two types of RTBH
Destination based RTBH
Source-based RTBH
Let’s have a look at both of them in this blog post.
Destination-Based BGP RTBH – Remotely Triggered Blackholing
The first RTBH idea was Destination-based RTBH.With this technique, SP and the Customer agree on the discard community.
When there is an attack on the server, the victim (customer) sends the server prefix with the previously agreed community value.
When SP receives the update with that community, action Continue reading
Addressing Mounting Ransomware Threats and Attacks with SASE
Ransomware's main weapon is lateral movement and infiltration within networks to capture valuable information. SASE can help prevent this.On Building a Personal Brand
How do you balance loyalty to yourself and loyalty to the company you work for?
This might seem like an odd question, but it’s an important component of work/life balance many of us just don’t think about any longer because, as Pete Davis says in Dedicated, we live in a world of infinite browsing. We’re afraid of sticking to one thing because it might reduce our future options. If we dedicate ourselves to something bigger than ourselves, then we might lose control of our direction. In particular, we should not dedicate ourselves to any single company, especially for too long. As a recent (excellent!) blog post over at the ACM says:
The idea that we should control our own destiny, never getting lost in anything larger than ourselves, is ubitiquos like water is to a fish. We don’t question it. We don’t argue. It is just true. We assume there are three people who are going to look after “me:” me, myself, and I.
I get it. Honestly, I do. I’ve been there Continue reading
Free Online Games You Can Play With Your Friends
Whether you’re looking for a way to stay connected with friends during quarantine or you’re just looking for a fun way to pass the time, playing online games is a great option. But with so many games out there, it can be tough to choose which one to play. That’s why we’ve put together a list of the best online games to play with friends. From classic games like Monopoly and Scrabble to newer favorites like Among Us and Jackbox Party Pack, there’s something for everyone on this list.
Free Online Games to Play With Friends
Monopoly
One of the most classic board games out there, Monopoly is a great option for online play. You can find a Monopoly app for both iPhones and Android devices, or you can play the game on your browser.
Words With Friends
Another classic board game, Words with Friends is a great way to stay in touch with friends and family. You can play the game on your browser or download the app for both iPhones and Android devices.
Scrabble
Like Words with Friends, Scrabble is a great option for those looking for a classic board game experience. You can play Scrabble on your Continue reading
Network Break 386: Extreme Debuts SD-WAN, Digital Twins; Cisco Launches SASE Service
This week's Network Break kicks off with listener FU and then dives into new SD-WAN and AIOps offerings from Extreme Networks. Cisco announces a SASE service and hints at a broader cloud security strategy. Arista adds to its Layer 1 switch portfolio while Ericsson and BT team up on private 5G in the United Kingdom.BGP-LS BGP Link State – What is it? Why BGP LS is used?
BGP LS, BGP Link-State is used to distribute Link state information and traffic engineering attributes from the network nodes to the Centralized TE controller. RSVP-TE has been providing resource allocation and providing an LSP with the distributed path computation algorithm (CSPF) for decades. It requires topology information from the network and only link-state IGP protocols such as OSPF and IS-IS can carry the topology information required for the controller to set up a shortest from each node to each destination prefix.
In order to overcome Bin Packing, Dead Lock, or Network-wide optimal traffic engineering, centralized controllers have been used for a long time. Because with the distributed computation for Traffic Engineering, the above issues might arise.
RFC 7752 specifies the details of North-Bound Distribution of Link-State and Traffic Engineering (TE) Information Using BGP.
PCE (Path Computation Element) is an SDN controller which provides optimal path computation in Multi Area and Multi AS (Autonomous System) deployments.
It requires Link State and Traffic Engineering attributes such as Link coloring, SRLG, reserved bandwidth, etc., from the network.
Link state IGP protocols (OSPF, IS-IS) can be used for this purpose but they are considered chatty and non-scalable, thus BGP with Continue reading
CCIE Service Provider v5.0 What, Why, When?
In this post, we will look at what is CCIE Service Provider v5.0, what comes with it, which technologies we need to learn, what is the difference between CCIE SP v4 and CCIE SP v5, why you should study for CCIE Service Provider v5, when you should study for CCIE SP exam, after which certificate you should aim it for, we will look at all of these questions.
What is the Cisco CCIE Service Provider v5 Exam?
The CCIE Service Provider v5 lab exam is testing skillsets related to the service Provider solutions integration, interoperation, configuration, and troubleshooting in complex networks. CCIE SP v5 is the latest version of the CCIE Service Provider lab exam. When the candidates pass this exam, they get their CCIE number.
This certification syllabus covers most, if not all real-life Service Provider network technologies.
What is the difference between CCIE SP v4 and CCIE SP v5?
From the technology standpoint, the biggest difference between CCIE SPv4.1 and the CCIE SP v5.0 exam is Network Programmability and Automation Module. It is 20% of the entire exam, thus very important in the CCIE Service Provider exam. You can access Orhan Ergun’s CCIE SP Network Continue reading
Tech Bytes: The Evolution Of Zero Trust Network Access (Sponsored)
Today on the Tech Bytes podcast, sponsored by Palo Alto Networks, we talk about Zero Trust Network Access and how it’s evolving to provide more comprehensive and consistent security.
The post Tech Bytes: The Evolution Of Zero Trust Network Access (Sponsored) appeared first on Packet Pushers.