Kentik

SEPTEMBER 10, 2021

However, despite the new origin (AS749) these prefixes are still routed exclusively through Hurricane Electric (AS6939) and traceroutes to the address space die at a router in Ashburn, Virginia (72.52.92.226, 100ge5-1.core2.ash1.he.net) he.net) as they did previously when AS8003 was the origin. Old AS paths: … 6939 8003.

Advertising 145

Advertising IP Address Internet Routers 145

Kentik

SEPTEMBER 20, 2021

Not as difficult as time travel, but it’s difficult enough so that for 30+ years IT professionals have tried to skirt the issue by adding more bandwidth between locations or by rolling out faster routers and switches. Each switch and router we pass through introduces a bit of latency that adds up quickly. How latency is measured.

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TCP Routers Bandwidth IP Address 116

Kentik

JULY 8, 2021

The Border Gateway Protocol (BGP) is a fundamental part of sending data over the internet. If you advertise some part of the IP space owned by someone else, and that advertisement is more specific than the one made by the owner of that IP space, then all of the data on the internet destined for that space will flow to your border router.

Advertising 124

Advertising Routers Internet Networking 124

Kentik

JANUARY 24, 2022

Back in the 1990s, NetFlow was introduced on Cisco routers as a means to collect information about IP network traffic as it enters or exits an interface. You can also learn about the protocols in use, the ports being used, the top interfaces, etc. IP protocol. Source port for UDP or TCP, 0 for other protocols.

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Application IP Address DNS Port 96

Network Engineering

MAY 5, 2023

I have this network when the network tries to communicate with the routers it fails. Router>enable Router# Router#configure terminal Enter configuration commands, one per line. Router>enable Router# Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z.

IP Address 52

IP Address Routers Protocol Networking 52

Kentik

DECEMBER 8, 2016

Not Just for NetFlow, Kentik Detect’s Analytics Cover All Major Flow Protocols. In networking terms, a “flow” defines a uni-directional set of packets sharing common attributes such as source and destination IP, source and destination ports, IP protocol, and type of service. NetFlow statefully tracks IP packets on a per-flow basis.

Protocol 40

Protocol Port Routers Networking 40

NW Kings

JANUARY 7, 2025

In this blog, we will explore what static routes are, how they differ from dynamic routes, and how to configure them on routers like Cisco devices. This characteristic makes them efficient for routers with limited processing capabilities. What is a Static Route? A static route is a manually configured path in a routing table.

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Routers IP Address Protocol Topology 52

Kentik

OCTOBER 4, 2021

According to a statement published last night, Facebook Engineering wrote, “Configuration changes on the backbone routers that coordinate network traffic between our data centers caused issues that interrupted this communication.” tfbnw.net — which is another router inside AS32934 that belongs to Facebook. So what happened?

TCP 145

TCP DNS Server Media 145

Noction

APRIL 9, 2024

Similar to interior gateway protocols (IGPs) like EIGRP, OSPF, or ISIS, BGP establishes peering with other routers before exchanging routing information. Understanding BGP states is essential to grasp how BGP operates. However,

Port 52

Port TCP Gateway Routers 52

Kentik

JULY 8, 2019

Border Gateway Protocol (more commonly known as BGP ) is the routing protocol that makes the internet work. It is the language spoken by routers to determine how packets can be sent from one router to another to reach their final destination. The entire RPKI process stands outside of the BGP routing protocol itself.

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Routers Protocol Internet Advertising 58

CATO Networks

APRIL 26, 2016

It lies at the core of how the Internet was built, its protocols, and how service providers implemented their routing layer. There isnt going to be a shiny new router that would magically solve it all. If they are lost along the way, it is the responsibility of higher-level protocols such as TCP to recover them.

Internet 52

Internet Routers MPLS Protocol 52

CATO Networks

JUNE 26, 2017

Since the early days of the Internet, routers were shaped by a myriad of technical constraints. General purpose processors lacked the processing power, forcing router vendors to rely on custom hardware. With the separation of the control and data planes, architects could build massively scalable routers.

Internet 52

Internet MPLS Routers Protocol 52

Kentik

MAY 8, 2023

While redundancy is a significant contributor to network resilience, other mechanisms, protocols, and methods can also contribute to overall network resilience. Many network protocols have been designed to handle different aspects of this process. Many network protocols have been designed to handle different aspects of this process.

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Networking Network IP Address TCP 52

Kentik

FEBRUARY 8, 2016

Designed before the dawn of the commercial Internet, the Border Gateway Protocol (BGP) is a policy-based routing protocol that has long been an established part of the Internet infrastructure. An internal routing scheme so that every router in a given AS knows how to get to every other router and destination within the same AS.

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Advertising Routers Internet Protocol 49

Network Engineering

FEBRUARY 8, 2019

I understand address resolution protocol, etc. For instance, I'd like to discover the MAC address of the nearest switch on the far side of a router. I understand the difference between layer2 & layer3 and MAC & IP. But is there any way to do a traceroute that will show Layer 2 information?

Routers 52

Routers Protocol 52

CATO Networks

SEPTEMBER 28, 2017

With stacks of appliances, including firewalls, WAN optimizers, and routers, comes complexity and breeding ground for problems. The sites ended up with dual routers running HSRP (the Hot Standby Router Protocol) to load balance traffic between them. But when the protocol failed, so did the location.

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MPLS WAN Cloud Routers 52

Kentik

SEPTEMBER 11, 2018

a sequence of related packets) as they traverse routers, switches, load balancers, ADCs, network visibility switches, and other devices. Network elements that support traffic monitoring protocols such as NetFlow and sFlow extract critical details from packet flows, like source, destination, byte and packet counts, and other attributes.

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Protocol Ethernet Networking Network 66

Kentik

MARCH 3, 2020

The most complex point of today’s networks is the edge, where there are more protocols, diverse traffic, and security exposure. switches, routers, firewalls), hence the licensing we use is lower for the data center devices. The network edge is where Kentik provides the highest value. The FlowPak is a bulk-licensed bucket of flows.

Data Centers 77

Data Centers Routers Firewall Protocol 77

Kentik

JANUARY 10, 2022

Or, perhaps one or more of the 10-20 routers in the path needed to reach the destination gets busy for a hundred milliseconds or so. Wifi strength, multiple routers in the path, and cable/fiber quality can and do play a major role in the overall perceived performance of a website. As a result, this event introduces additional slowness.

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IP Address DNS TCP Application 98

Network Engineering

MARCH 17, 2019

However in my case , we have two routers that are directly connected using Bundle Link (AE Link) that has 2 x 10G member Links. Now each router should have interface metric of 50. Both are MX960 series routers. 30; } family mpls; } R2> show configuration protocols isis interface ae16.3 IS-IS is running between them.

Protocol 52

Protocol Bandwidth Routers MPLS 52

Kentik

OCTOBER 12, 2021

Fifteen years ago, NetOps could start up a packet analyzer and see all kinds of different unencrypted protocols such as FTP, SMTP, POP3, HTTP, DNS, etc. These protocols helped the NPM identify applications. Start up a packet or flow analyzer and make note of the most popular protocol. It’s encrypted HTTPS. It’s encrypted HTTPS.

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Encryption DNS IP Address Protocol 84

Kentik

JANUARY 13, 2021

Send these pings using the Internet Control Message Protocol (ICMP) or TCP to one or any of the devices you believe to be involved. Ping is a utility that’s available on practically every system, be it a desktop, server, router, or switch. There’s a sports analogy that says “the most important ability is availability” for systems.

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Networking Network TCP Protocol 114

CATO Networks

OCTOBER 30, 2019

Network packets, the protocol data units (PDUs) of the network layer, are often taken for granted by network pros. Routers forward these packets from source to destination and data encapsulation enables the data to traverse the TCP/IP stack. Common causes of packet loss include: Routers with heavy CPU load. tracert/traceroute.

WAN 52

WAN Routers TCP Protocol 52

Kentik

APRIL 18, 2016

While NetFlow v9 and it’s follow-on protocol IPFIX offer tremendous flexibility there are some tradeoffs including complexity of implementation and the fact that a template must be received before the underlying flow data records can be correctly understood. The sFlow difference.

Protocol 40

Protocol Routers Encryption IP Address 40

Network Engineering

DECEMBER 11, 2023

We have a block of static IPs facing the public, and have to have a router which points all the traffic to our router/gateway which points all the traffic to the ISP. Right now, all traffic has a static rule to send all traffic to the ISP gateway on the router at the edge going to the hand off. network subnet 10.113.0.0

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VPN Port Protocol WAN 52

Kentik

FEBRUARY 8, 2023

Port mirroring Another method for gathering traffic telemetry is port mirroring, which replicates (mirrors) the network traffic on a switch or router to a monitoring device. This data can then be analyzed and used to monitor network performance, detect issues, and troubleshoot problems.

Networking 111

Networking Network Port IP Address 111

Kentik

MARCH 28, 2016

How flow protocols adapt as network needs evolve. But while NetFlow and its variants like IPFIX and sFlow are similar overall, beneath the surface there are significant differences in the way the protocols are structured, how they operate, and the types of information they can provide. More of a good thing.

Protocol 40

Protocol Routers MPLS IP Address 40

Kentik

AUGUST 1, 2016

In particular we’ve learned that speaking or advertising BGP to your service providers and/or peers lets you do two things: Make semi-intelligent routing decisions concerning the best path for a particular route to take outbound from your network (otherwise you would simply set a default route from your border routers into your service providers).

Routers 40

Routers Advertising IP Address Ethernet 40

NW Kings

JANUARY 9, 2025

Ensuring security protocols are in place. On the other hand, if you prefer working with routers, switches, and network systems, a career as a Network Engineer could be ideal. They design, maintain, and manage cloud infrastructure and services. Key responsibilities include: Deploying applications in the cloud.

Engineering 52

Engineering Cloud Networking Network 52

Kentik

JULY 20, 2018

NetFlow is a protocol that was originally developed by Cisco to help network operators gain a better understanding of their network traffic conditions. Juniper MX and PTX series routers (via IPFIX). Alcatel-Lucent routers. Huawei routers. Cisco Catalyst switches. Enterasys switches. Flowmon probes. Linux devices.

Routers 40

Routers IP Address Protocol Server 40

Kentik

APRIL 24, 2017

Comparing flow protocols for real-world large-scale networks. A lot of ink has been spilled over the years on the topic of flow protocols, specifically how they work and their relative accuracy. One of the things that can be rather confusing is that there are a lot of different flow protocol names.

Protocol 40

Protocol Routers Bandwidth Internet 40

CATO Networks

APRIL 20, 2016

Originally, the concept of SDN emerged as a way to unbundle a hardware networking device (like a router) into a software-based control plane and a hardware-based data plane. It was slow to evolve, but it was unavoidable. Enters software-defined networking (SDN).

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Network Security Networking Cloud Network 52

CloudFaire

JANUARY 3, 2025

As a result, Internet devices usually use a single path and let the routers handle the path selection. It's a major extension to the TCP protocol, and historically most of the TCP changes failed to gain traction. There is another way. MPTCP has had a long history see the Wikipedia article and the spec (RFC 8684) for details.

TCP 137

TCP Port Server Advertising 137

Kentik

JANUARY 19, 2018

And a Google Cast protocol bug caused temporary Wi-Fi outages. Google Cast protocol bug causing temporary Wi-Fi outages on many routers (The Register) “Wi-Fi router vendors have started issuing patches to defend their products against Google Chromecast devices,” reported The Register earlier this week.

Networking 40

Networking Network Routers Artificial Intelligence 40

Kentik

MAY 21, 2019

The Mirai botnet was first discovered back in 2016, but has continued to persist and abuse common vulnerabilities and exposures (CVEs) on IoT devices, including home routers and many other network-connected devices. Vuldb has additional information on the life of this exploit.).

Port 81

Port IP Address Internet Networking 81

Kentik

APRIL 3, 2023

For example, to determine latency using traffic generated from probes or by analyzing packets, that traffic would likely pass through routers, firewalls, security appliances, load balancers, etc. Second, in a busy network, devices such as routers, switches, and firewalls may be very busy operating at a relatively high CPU.

TCP 110

TCP Application Virtual machine Networking 110

Kentik

FEBRUARY 13, 2017

Another fun project utilized kFlow (Kentik’s internal flow-data protocol) to send measurements from an Intel Arduino board and GPIO-connected temperature sensor to the Kentik Data Engine (KDE), our distributed big data backend. So a major area of interest is exploring the use of lower-cost edge routers or even white box-based solutions.

Routers 40

Routers DNS Protocol Engineering 40