Kentik

APRIL 3, 2023

event(data) duration = float(event) / 1000000 print("TCP retransmit detected (duration: %0.2f 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.

TCP 110

TCP Application Virtual machine Network 110

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. port=0, tag=any dst ip/id=0.0.0.0,

VPN 52

VPN Port Protocol WAN 52

Kentik

MARCH 13, 2019

A common DDoS mitigation technique is Remotely-Triggered Black Hole (RTBH), which requires extensive pre-configuration of discard routes and/or uRPF on all edge routers. Destination port. Source port. It’s now much easier to propagate filters to all edge routers in large networks. Destination Prefix. Source Prefix.

IP Address 49

IP Address Port Routers DNS 49

Kentik

FEBRUARY 8, 2016

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. One or multiple border routers. This peering connection is used by border routers in one AS to “advertise” routes to border routers in a different AS (more on this below).

Advertising 49

Advertising Routers Internet Protocol 49

Kentik

DECEMBER 2, 2015

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. First, we’ll write a query to get a list of all the hosts in the network that are receiving traffic from remote source port TCP/25 (the traffic described in Step 2 above).

TCP 40

TCP Protocol Port IP Address 40

Kentik

SEPTEMBER 11, 2018

a sequence of related packets) as they traverse routers, switches, load balancers, ADCs, network visibility switches, and other devices. In networking terms, a “flow” is a unidirectional set of packets sharing common attributes such as source and destination IP, source and destination ports, IP protocol, and type of service.

Protocol 66

Protocol Ethernet Network Networking 66

Kentik

DECEMBER 8, 2016

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. Source & dest port. Not Just for NetFlow, Kentik Detect’s Analytics Cover All Major Flow Protocols. Flow Data Variations. Next hop IP.

Protocol 40

Protocol Port Routers Network 40

Kentik

SEPTEMBER 20, 2016

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. TCP is the key. Specifically TCP, which is used in over 90% of network transactions. As an example, we’ll use traffic from Kentik’s own servers.

Network 40

Network Networking TCP Server 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

Kentik

DECEMBER 18, 2017

So it’s interesting to see that Juniper Networks, at 49.6%, is the leading maker of routers and switches sending flow to Kentik Detect. Port Numbers and Services. Now let’s take a look at TCP/UDP port numbers, so we can get an idea of what kind of services are in use. Network Devices: Which Brands are Trending?

Protocol 40

Protocol UDP port Port TCP 40