Javascript Notes: Variables
Like most languages, variables in Javascript are defined with the = operator. There are 3 different keywords that can be used to define a variable. var - Depricated, should not be used for ES6+. let - Variable can be re-assigned. Value can be mutated. const - Variable cannot be...continue reading
Vapor IO Realizes Open Grid Vision With INZONE 5G Edge Services
One of the defining characteristics of edge applications is the need for low latency to absorb and analyze data from connected devices deployed in locations such as retail stores, manufacturing facilities, distribution centers, and municipal infrastructure. Until recently, most chatter about “the edge” has been vague, often conflating the extension of cloud service delivery to […]
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Tech Bytes: Advania Chooses Apstra For Data Center Operations (Sponsored)
Today on the Tech Bytes podcast, sponsored by Juniper, we talk with a customer of Juniper’s Apstra intent-based networking data center software. IT solutions provider Advania uses Apstra internally to operate its own data centers, as well as for customer engagements.
The post Tech Bytes: Advania Chooses Apstra For Data Center Operations (Sponsored) appeared first on Packet Pushers.
Tech Bytes: Advania Chooses Apstra For Data Center Operations (Sponsored)
Today on the Tech Bytes podcast, sponsored by Juniper, we talk with a customer of Juniper’s Apstra intent-based networking data center software. IT solutions provider Advania uses Apstra internally to operate its own data centers, as well as for customer engagements.Sunburst
docker run -p 8008:8008 -p 6343:6343/udp sflow/prometheusThe pre-built sflow/prometheus Docker image packages sFlow-RT with the applications for exploring real-time sFlow analytics. Run the command above, configure network devices to send sFlow to the application on UDP port 6343 (the default sFlow port) and connect with a web browser to port 8008 to access the user interface.
The chart at the top of this article demonstrates the visibility that sFlow can provide into nested protocol stacks that result from network virtualization. For example, the most deeply nested set of protocols shown in the chart is:
- eth: Ethernet
- q: IEEE 802.1Q VLAN
- trill: Transparent Interconnection of Lots of Links (TRILL)
- eth: Ethernet
- q: IEEE 802.1Q VLAN
- ip: Internet Protocol (IP) version 4
- udp: User Datagram Protocol (UDP)
- vxlan: Virtual eXtensible Local Area Network (VXLAN)
- eth: Ethernet
- ip Internet Protocol (IP) version 4
- esp IPsec Encapsulating Continue reading
VXLAN: Virtualizing Data Center Networks for the Cloud Era
This blog reviews what VXLAN is, why it was developed, how it is being used in data centers, and advantages over other virtualization technologies.
The post VXLAN: Virtualizing Data Center Networks for the Cloud Era appeared first on Pluribus Networks.
VXLAN: Virtualizing Data Center Networks for the Cloud Era
Since VXLAN was introduced in 2014 it has become an important component of modern data center network fabrics. This blog reviews what VXLAN is, why it was developed, how it is being used in data centers, and advantages over other virtualization technologies. In an upcoming blog, we will look at some innovative VXLAN applications outside the data center.
What is VXLAN?
Virtual eXtensible Local Area Network (VXLAN) is an Internet standard protocol that provides a means of encapsulating Ethernet (Layer 2) frames over an IP (Layer 3) network, a concept often referred to as “tunneling.” This allows devices and applications to communicate across a large physical network as if they were located on the same Ethernet Layer 2 network.
Tunneling approaches such as VXLAN provide an important tool to virtualize the physical network, often called the “underlay,” and allow for connectivity to be defined and managed as a set of virtual connections, called the “overlay.” These virtual connections can be created, modified and removed as needed without any change to the physical underlay network. (Mike Capuano’s blog, What to Know About Data Center Overlay Networks, provides a deeper dive on overlays.)
While VXLAN is only one Continue reading
Network Break 357: Switchless Networking? Startup Rockport Says Yes; ISPs Monetize Customer Surveillance
Take a Network Break! This week we discuss how startup Rockport Networks brings switchless networking to the data center. The FTC says ISPs are amassing and monetizing sensitive customer data. Cisco unveils new routing silicon, Juniper sees revenues rise and income fall, and more tech news.
The post Network Break 357: Switchless Networking? Startup Rockport Says Yes; ISPs Monetize Customer Surveillance appeared first on Packet Pushers.
Network Break 357: Switchless Networking? Startup Rockport Says Yes; ISPs Monetize Customer Surveillance
Take a Network Break! This week we discuss how startup Rockport Networks brings switchless networking to the data center. The FTC says ISPs are amassing and monetizing sensitive customer data. Cisco unveils new routing silicon, Juniper sees revenues rise and income fall, and more tech news.LEO Satellite Broadband: Top Considerations for Enterprise IT
The low-earth orbit satellite (LEO) space race is underway and warrants watching and continued evaluation.Sudan: seven days without Internet access (and counting)
It's not every day that there is no Internet access in an entire country. In the case of Sudan, it has been five days without Internet after political turmoil that started last Monday, October 25, 2021 (as we described).
The outage continues with almost a flat line and just a trickle of Internet traffic from Sudan. Cloudflare Radar shows that the Internet in Sudan is still almost completely cut off.
There was a blip of traffic on Tuesday at ~14:00 UTC, for about one hour, but it flattened out again, and it continues like that — anyone can track the evolution on the Sudan page of Cloudflare Radar.
Internet shutdowns are not that rare
Internet disruptions, including shutdowns and social media restrictions, are common occurrences in some countries and Sudan is one where this happens more frequently than most countries according to Human Rights Watch. In our June blog, we talked about Sudan when the country decided to shut down the Internet to prevent cheating in exams, but there were situations in the past more similar to this days-long shutdown — something that usually happens when there’s political unrest.
The country's longest recorded network disruption was back in Continue reading
netsim-tools Release 1.0
It looks like netsim-tools reached a somewhat stable state, so it was time to do a cleanup and publish release 1.0 (also available on PyPi, use pip3 install –upgrade netsim-tools to fetch it).
During the cleanup, I removed all references to the obsolete scripts, leaving only the netlab command. I also found an old bash script that enabled LLDP passthrough on Linux bridges and made it part of netlab up process; your libvirt-based labs will have LLDP enabled by default.
Interested? Install the tools and follow the tutorials to get started.
netsim-tools Release 1.0
It looks like netsim-tools reached a somewhat stable state, so it was time to do a cleanup and publish release 1.0 (also available on PyPi, use pip3 install –upgrade netsim-tools to fetch it).
During the cleanup, I removed all references to the obsolete scripts, leaving only the netlab command. I also found an old bash script that enabled LLDP passthrough on Linux bridges and made it part of netlab up process; your libvirt-based labs will have LLDP enabled by default.
Interested? Install the tools and follow the tutorials to get started.