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. Get the Path with Traceroute. Could it be a misconfiguration issue?

Network 114

Network Networking TCP Protocol 114

Kentik

APRIL 3, 2023

event(data) duration = float(event) / 1000000 print("TCP retransmit detected (duration: %0.2f Higher level abstractions For another level of abstraction, open source tools have emerged, such as Cilium , which runs as an agent in container pods or on servers. ms)" % duration) # loop and handle perf output events bpf["events"].open_perf_buffer(print_event)

TCP 110

TCP Application Virtual machine Network 110

Kentik

DECEMBER 18, 2019

we never initiate connections to the customers) on servers running Debian GNU/Linux. 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. BGP peering uptime is part of Kentik’s contracted SLA - 99.99%.

Server 13

Server Topology TCP Network 13

CATO Networks

OCTOBER 30, 2019

We all get the concept: to transmit data over a TCP/IP network like the Internet requires the data be broken down into small packets (usually less than 1500 bytes) containing the relevant application data (payload) and headers. Common causes of packet loss include: Routers with heavy CPU load. Security breaches. Network congestion.

WAN 52

WAN Routers TCP Protocol 52

Kentik

SEPTEMBER 20, 2016

For example, using SNMP or flow data to track traffic volume on interfaces, servers, and devices can provide necessary visibility into possible congestion points. In this post we’ll talk about using Kentik’s NPM solution to watch the TCP performance of traffic as reported to Kentik Detect from a Kentik nProbe host agent.

Network 40

Network Networking TCP Server 40

CATO Networks

JUNE 1, 2020

The challenge in the underlying causes of packet loss can be anything from overworked routers to network congestion to software bugs. Proxy TCP Connections Fundamentally, TCP (Transmission Control Protocol) connections inherently add more overhead than their UDP (User Datagram Protocol) counterparts.

Network 52

Network Networking TCP MPLS 52

Kentik

OCTOBER 12, 2021

Once you saw a person’s password to any given application, you knew they were generally using the same one for all of their other applications — email, the ticketing system, the FTP and Novell servers, etc. HTTP is the new TCP. Well, that didn’t last long. Encrypted passwords came along as did token authentication.

Encryption 84

Encryption DNS IP Address Protocol 84

Kentik

DECEMBER 2, 2015

The issue was a new type of “spam reflection” that was causing headaches by allowing spammers to avoid detection while utilizing servers inside the customer’s network as spam sources. Here’s how these types of schemes work: The spammer sends a SYN from a spoofed source IP address to TCP port 25 (SMTP) on the target mail server.

TCP 40

TCP Protocol Port IP Address 40

Kentik

AUGUST 28, 2019

Steaming telemetry uses a push-based mechanism with which data can be transmitted automatically and continuously from various remote sources (such as routers, switches, firewalls, etc.) For example: Transport options: Many choices like TCP, UDP, and gRPC. to some centralized platform for storage and analysis.

Network 16

Network Networking Protocol TCP 16

Kentik

DECEMBER 19, 2016

If the link is congested, then a basic NetFlow tool function allows you to double click on that, and you can see that the link is full because there’s tons of traffic due to the database servers syncing. The link may be almost full, but there may be no TCP retransmits, and the latency may be good. So the data’s coming from the servers.

Network 40

Network Networking Application Server 40

Kentik

AUGUST 28, 2019

Steaming telemetry uses a push-based mechanism with which data can be transmitted automatically and continuously from various remote network devices (such as routers, switches, firewalls, etc.) For example: Transport options: Many choices like TCP, UDP, and gRPC. to some centralized location for storage and analysis.

Network 52

Network Networking Protocol TCP 52

CATO Networks

MAY 21, 2018

If a link becomes congested, Internet routers use Random Early Discard (RED) queuing algorithms to reduce the flow rate of TCP sessions, dropping packets as necessary. The photos and the actual HTML page content are often served from a separate web server using separate sessions of only few milliseconds.

Internet 40

Internet MPLS WAN Media 40

Kentik

MARCH 27, 2017

The disruption of network bandwidth or performance to any particular set of services can create a disastrous ripple effect on the entire application eco-system, which makes it critical to protect more than just north-south, client-server Web traffic. Hackers can shut down Web revenues by disabling just one critical dependency.

Cloud 40

Cloud Internet Bandwidth Network 40

Kentik

JULY 11, 2017

This pane is nearly identical to the Devices pane in Kentik Detect’s Data Explorer (see our Knowledge Base topic Explorer Device Selector ), but without the Router and nProbe buttons. For example, maybe you want to track the top 25 interfaces in your network receiving web (80/TCP) traffic and be notified if that list changes for any reason.

Email 40

Email Network Networking IP Address 40

Kentik

JULY 28, 2021

It isn’t so much that packet loss is a huge problem — TCP and QUIC were engineered in anticipation that lost packets would be inevitable. Latency : Missing packets in connection-oriented protocols such as TCP and QUIC result in lost packets getting resent. Bad hardware (the switch or router port). Overwhelmed router.

Cloud 116

Cloud TCP Routers Protocol 116