Network Engineering

JULY 2, 2020

I'm trying to connect 4 networks with 1 router, i created 2 sub-interfaces in the router, when i tried to create the 3rd sub-interface i got this output "%Cannot create sub-interface", this is my topology: This is my Router's configuration: hostname Router ! ip cef ip ipv6 cef ! spanning-tree mode pvst !

IP Address 130

IP Address Routers Topology Gateway 130

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.

TCP 116

TCP Routers Bandwidth IP Address 116

Kentik

MARCH 13, 2023

Why do we need to create site-to-site VPNs or some sort of modern SD-WAN topology connecting all our branches when almost all traffic goes to the public internet and the cloud? We still need to connect our infrastructure to the public internet, so the enterprise WAN is still about routers, circuit IDs, and perimeter firewalls.

WAN 98

WAN Wide Area Network Topology Internet 98

Kentik

DECEMBER 13, 2021

Notice above that the routers used in the connection are looking pretty snappy. If you don’t have fancy tools that tell you who is communicating through the router, take all other internet capable devices offline. If you have access to your local router, login and see if you can give connections to your SaaS application a priority.

Application 95

Application DNS Routers Server 95

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 feature in networks predicts and stabilizes the topology. This characteristic makes them efficient for routers with limited processing capabilities.

Routers 52

Routers IP Address Protocol Topology 52

Kentik

JUNE 7, 2023

Kentik Cloud users can now access the new Kentik Map for Google Cloud to automatically visualize detailed Google Cloud and hybrid cloud infrastructure topology. In addition, the map visualizes Dedicated Interconnect attachments, VM interfaces, and VPN gateways with their associated on-prem and cloud routers.

Cloud 97

Cloud Gateway Port IP Address 97

Kentik

MAY 8, 2023

This includes the ability to: Dynamically adjust to changes in network topology Detect and respond to outages Route around faults in order to maintain connectivity and service levels. It is used to maintain network connectivity by helping routers find the best path for traffic to travel through.

Networking 52

Networking Network IP Address TCP 52

The Network DNA

JULY 5, 2024

VXLAN EVPN Basic Topology EVPN Route Type The EVPN control plane advertises the following types of information: Ethernet auto-discovery (AD) routes are route type 1. Ethernet segment routes, or route type 4, are used to broadcast the length of the IP address, the originating router's IP address, and the Ethernet segment identifier.

IP Address 52

IP Address Ethernet Advertising Unicast 52

Kentik

SEPTEMBER 19, 2018

The physical topology continues to expand with relentless traffic growth, and a constant stream of new technologies like SDN, Clos architectures, and cloud interconnects make it even harder to understand how services traverse the network between application infrastructure and users or customers. Let’s face it — today’s networks are complex.

Networking 49

Networking Network Routers Server 49

Kentik

MARCH 19, 2020

If the VPN gateways cannot generate flow or Syslog with traffic, the next richest data comes from the edge routers or switches near the VPN devices. This data is useful for Kentik’s automated capacity planning workflows and building topological maps (layer 2 and layer 3 connectivity).

VPN 69

VPN Networking Network Gateway 69

Kentik

APRIL 4, 2023

Be it power supplies, servers, routers, load balancers, proxies, or any other physical and virtual network components, the horizontal scaling that redundancy provides is the ultimate safety net in the presence of failure or atypical traffic demands.

Cloud 104

Cloud Networking Network Bandwidth 104

Kentik

DECEMBER 18, 2019

Given that we only have one IP active in on each node, the next step was to have this landing node act as a router for inbound BGP connections with policy routing as the high-level design. On top of that, since our BGP nodes were identical, the distribution of sessions should be balanced. IPv6 peerings are starting to outgrow a single node.

Server 13

Server Topology TCP DNS 13

Kentik

JANUARY 29, 2020

That includes adding in high-value data such as threat feed and threat modeling, routing, topology, and other important networking information to model answers to difficult questions. Flow can also be used to understand consumption of bandwidth in a more granular manner.

Port 16

Port Networking Network Data Centers 16

DoorDash Engineering

JANUARY 16, 2024

Internal Envoy routers allow communication between the global cell and replicated cells. Enable the zone-aware routing feature for internal Envoy routers Make the solution more extensible to support HTTP1/HTTP2/gRPC traffic using other domains beyond DDSD. This approach enables us to reduce the blast radius of a single-cell failure.

Cloud 84

Cloud IP Address DNS Routers 84

Kentik

JANUARY 29, 2020

That includes adding in high-value data such as threat feed and threat modeling, routing, topology, and other important networking information to model answers to difficult questions. Flow can also be used to understand consumption of bandwidth in a more granular manner.

Port 78

Port Networking Network Data Centers 78

CATO Networks

AUGUST 22, 2023

Traditional WAN Overview WANs were designed to connect distributed corporate locations, traditionally, with WAN routers at each location. These WAN routers defined the network boundaries and routed traffic to the appropriate destination. This generates significant cost savings when compared to traditional WANs.

WAN 52

WAN Bandwidth Data Centers Routers 52

CATO Networks

NOVEMBER 15, 2017

MPLS circuits are extremely expensive, with a router required at each site, access circuits, bandwidth cost, and the associated CoS fee. Managing hybrid WAN topologies, which combine MPLS and the Internet, with legacy approaches to branch networking is often costly and ineffective as well.

MPLS 52

MPLS WAN Cloud Wide Area Network 52

Kentik

MAY 31, 2023

Under this model, network topology is highly variable, creating a complexity that can mask root causes and make proactive availability configurations a highly brittle point of the network. A single misconfiguration, such as an incorrect firewall rule or a misrouted connection, can trigger a cascade of failures.

Networking 52

Networking Network Cloud Routers 52

Kentik

OCTOBER 3, 2016

There are appliances, there’s downloadable software, but there’s been no SaaS option that gives them the basic network visibility that they want, with an understanding of their topology and how networks interconnect, but also gives them the context of what the performance of that traffic is. It gets back to that age-old “is it the network?”

Routers 40

Routers Internet Networking Network 40

CATO Networks

AUGUST 7, 2018

The policies and routing intelligence would run in one or more servers (controllers), which would instruct the networking elements forwarding the packets (switches and routers). SDNs first were introduced in the data center with the goal of increasing network by separating the data plane from the control plane.

WAN 52

WAN MPLS Wide Area Network Data Centers 52

Kentik

MAY 9, 2017

ingested into the Kentik Data Engine with two new fields that represent the Device (router) and Site (PoP) where that flow will exit the network to an adjacent autonomous system (AS). We can’t yet see where (geographically or topologically) the traffic from XYZ is entering the network, and we also can’t see where it egresses to the next hop.

Internet 40

Internet Routers Networking Network 40

Kentik

MARCH 6, 2019

Kube-router (CloudNativeLabs) - provides a Linux LVS/IPVS-based service proxy, a Linux kernel forwarding-based pod-to-pod networking solution with no overlays. It’s responsible for the reliable delivery of requests through the complex topology of services that comprise a modern, cloud-native application.

Networking 63

Networking Network Application Cloud 63

Kentik

JUNE 5, 2023

In this incident, a software bug caused a router to announce a large part of the IP address ranges present in the global routing table as if they were originated by AS7007. Two competing methodologies, RPSL and RPKI, are used to inform the defensive configuration of routers.

IP Address 145

IP Address DNS Internet Routers 145

Rule 11

JUNE 21, 2024

Topology Aware Routing is a feature of Kubernetes that prevents cluster traffic within one availability zone from crossing to another availability zone. TL;DR: AES-GCM is great, as long as every nonce (mnemonic: number used once) is truly unique. Once a nonce is reused, AES-GCM completely falls apart.

Energy 40

Energy Routers Topology DNS 40

Network Engineering

JANUARY 24, 2025

Let's say, that there is a following network topology: As seen on the drawing, the router named as30-r1 is connected to IXP LAN with network 10.81.80.0/22 count 1 sends an ICMP echo request message correctly to as10-r1 router. Accepting these routes may create a black hole for connectivity to the IXP LAN. 24 user 0 192.168.5.1

LAN 130

LAN Routers Topology Internet 130