Kentik

SEPTEMBER 22, 2021

Knowing the source and destination IPs of the NetFlow of a traffic surge isn’t enough to decompose a networking incident into the specific OTT services, ports, and CDNs involved. The capability is more than simple NetFlow analysis. Microsoft Patch Tuesday. Last week, Kentik customers were experiencing another Patch Tuesday.

DNS 145

DNS Port Routers Network 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

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. Source port for UDP or TCP, 0 for other protocols. Don’t rely on ports.

Application 96

Application IP Address DNS Port 96

Kentik

FEBRUARY 3, 2022

Comparing your transit price with the cost of a port to an internet exchange (IX) will not give an adequate picture since a number of other factors need to be taken into account. Membership fee in the case of an IX port. Share of router per interface. $30. Economics: How to understand the cost of your connectivity. Monthly cost.

Port 105

Port 5G Routers Internet 105

Network Engineering

JANUARY 1, 2025

Objectives Install FreeRADIUS on CentOS(steam 9) to perform Cisco device authentication Perform dot1x authentication on all ports of the switch Perform authentication by connecting a laptop to the switch CentOS(203.230.7.2) - Cisco 2960 Switch(203.230.7.254) - Cisco 2800 Series Router(gig0/0 : 203.230.7.1, 255.255.255.0

Port 52

Port Routers Firewall Server 52

Packet Pushers

MARCH 8, 2024

Today we metaphorically pop open the hood of switches and routers, taking a look at the mechanics of how they work. We also cover line rate, port-to-port latency, and buffers. Read more » Today we metaphorically pop open the hood of switches and routers, taking a look at the mechanics of how they work.

Port 52

Port MPLS Routers Network 52

Kentik

FEBRUARY 8, 2023

This can be done through a variety of techniques, such as using network taps, port mirroring, or software probes. 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.

Network 111

Network Networking Port IP Address 111

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. These addresses were apparently port scanning IP addresses that belonged to the company sending the letter.

Port 81

Port IP Address Internet Network 81

Kentik

NOVEMBER 17, 2021

Knowing the source and destination IPs of the NetFlow of a traffic surge isn’t enough to decompose a networking incident into the specific OTT services, ports, and CDNs involved. The capability is more than simple NetFlow analysis. The spice (and traffic) must flow. HBO Max OTT traffic analysis by source. How does OTT Service Tracking help?

DNS 99

DNS Port Routers Network 99

Network Engineering

OCTOBER 7, 2015

We have a Cisco 3825 router with an IPSec Remote Access VPN configured to authenticate against a radius server. We changed the radius-server host line in our config accordingly and the router is able to communicate with the new radius server. We're retiring the old server and moving to a new one (Windows Server 2012).

VPN 52

VPN Port Routers Server 52

Network Engineering

APRIL 7, 2022

When I connect a device to port 3 or 5, regardless if I have the port set to auto or I assign a static IP, I can not get anything to connect to the VLAN1 or VLAN2 (I am doing all this with the managed led on) I am sure I missing something simple. Anyone see what I am doing wrong? Thank You.

Port 52

Port IP Address Routers 52

Kentik

NOVEMBER 7, 2021

The NetOps team can’t Telnet to routers and look at routing tables, and they can’t change routes or span a port to collect packets. See the example below: If you have several probes all reporting issues with the same isolated router hop, there is strength in numbers. To take advantage of this, the data can be trended over time.

Routers 104

Routers Internet Application Server 104

Kentik

JUNE 7, 2023

They capture detailed information about network traffic, including: Source and destination IP addresses Ports Protocols Packet counts By analyzing these logs, you can gain visibility into the volume, patterns, and characteristics of traffic, such as whether it’s being dropped or incorrectly routed, to identify connectivity issues.

Cloud 97

Cloud Gateway Port IP Address 97

Network Engineering

FEBRUARY 2, 2024

However, I'm encountering difficulties at the step where I need to configure a routed port or a static route. set system mode router ! Despite attempting these configurations, I'm unable to achieve successful communication between the different VLANs. no ip address dhcp !

IP Address 52

IP Address Port Routers 52

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

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. NOTE : Join our Network Specialist Master’s Program today!

Routers 52

Routers IP Address Protocol Topology 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

The Network DNA

NOVEMBER 26, 2024

Security: Cisco ASA Vs Cisco FTD - The Network DNA Site-to-Site VPN: IPSEC Tunnel Between an ASA and a Cisco IOS Router Cisco Security: Cisco ASA 5505 Interfaces configuration for Access Ports Cisco Security: Cisco ASA 5505 Interfaces configuration for Trunk Port Cisco ASA Series 1: Restoring the ASA to Factory Default Configuration Cisco ASA Series (..)

Firewall 52

Firewall VPN IP Address Port 52

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

The Network DNA

NOVEMBER 26, 2024

Security: Cisco ASA Vs Cisco FTD - The Network DNA Site-to-Site VPN: IPSEC Tunnel Between an ASA and a Cisco IOS Router Cisco Security: Cisco ASA 5505 Interfaces configuration for Access Ports Cisco Security: Cisco ASA 5505 Interfaces configuration for Trunk Port Cisco ASA Series 1: Restoring the ASA to Factory Default Configuration Cisco ASA Series (..)

Firewall 52

Firewall IP Address VPN Port 52

DCNN Magazine

JANUARY 8, 2025

To upgrade the LOFAR infrastructure: ASTRON is leveraging Juniper’s PTX Series Packet Transport Routers, including the PTX10004 and PTX10002, to deliver ultra-high port density, unyielding throughput performance, and unmatched sustainable efficiencies to support ASTRONs core infrastructure.

Network 52

Network Networking Bandwidth Routers 52

Juniper

DECEMBER 19, 2024

New Marvis Actions enhance wireless and wired troubleshooting with features like Misconfigured Switch Port for identifying blackhole traffic, AP Loop Detection for reporting traffic loops, and Offline APs for identifying APs that are unreachable due to ISP outages.

Network 83

Network Networking Wide Area Network Data Centers 83

Kentik

JANUARY 13, 2021

Ping is a utility that’s available on practically every system, be it a desktop, server, router, or switch. Both packets and flows provide information about the source and destination IPs, ports, and protocols. If it’s unclear from flow, and often if it’s a router or other system bug, you may need to go to the packets.

Network 114

Network Networking TCP Protocol 114

Kentik

JANUARY 29, 2020

This includes port, IP source, destination, port numbers, and other markings such as quality of service (QoS). For example, looking per IP, per network and, oftentimes, into virtual constructs, such as MPLS, VPNs, and other virtual router devices, allows for a much deeper understanding of the traffic.

Port 16

Port Network Networking Data Centers 16

Kentik

JANUARY 29, 2020

This includes port, IP source, destination, port numbers, and other markings such as quality of service (QoS). For example, looking per IP, per network and, oftentimes, into virtual constructs, such as MPLS, VPNs, and other virtual router devices, allows for a much deeper understanding of the traffic.

Port 78

Port Network Networking Data Centers 78

Engineering at Meta

OCTOBER 2, 2024

Instead of simply porting our mobile social apps, we chose React Native as it enabled our teams to iterate and build quickly with robust animation capabilities, great performance, and a shared platform that powers most of the 2D Meta Quest system apps.

Engineering 135

Engineering Application Port JavaScript 135

Kentik

JANUARY 11, 2016

So next, to shed further light on the nature of the DDoS attack, we want to know the port that this UDP traffic is aimed at. To see that, we go back to the Metrics menu and choose Destination » Port. We can get an initial feel for this by looking a little deeper at the ports involved. 32 from the source countries of the attack.

Port 40

Port Network Networking UDP port 40

Kentik

MARCH 19, 2020

This configuration is known as a “split-tunnel” configuration and is set up by rules to exclude specific ports, protocols, or networks. 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. More advanced VPNs can do this by application type.

VPN 69

VPN Network Networking Gateway 69

Kentik

JUNE 30, 2015

We were one of SprintLink’s first BGP customers, and we had dozens of Cisco and Wellfleet routers. Were our servers talking to each other on weird ports? And we had hundreds of “big” Cisco routers that were capable of generating Cisco’s new NetFlow network data. Between 2001 and 2011, NetFlow export from routers matured.

Routers 40

Routers Port Server Network 40

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 Network 110

CATO Networks

JANUARY 17, 2018

In some cases, network scanners will use port scans and in other cases ping sweeps. Attackers may try to gain control of IoT devices or routers, control them using a bot that may be used later for DDoS attacks (such as the Mirai botnet ) or even cryptocurrencies mining, which are very popular these days. What is Network Scanning?

Network 52

Network Networking Server Port 52

Network Engineering

NOVEMBER 24, 2022

{master} nms@MX960> request routing-engine login other-routing-engine connect to address 128.0.0.4: Operation timed out Trying 10.0.0.4. re0: Operation timed out connect to address 128.0.0.4: Operation timed out Trying 10.0.0.4. But then, it is up again, but from RE1, I still couldn't show any command invoke-on backup RE (RE0).

Engineering 52

Engineering Routers Port MPLS 52

Juniper

JANUARY 21, 2025

Onze producten voor campus en kantoor , datacenters , WAN-routering en beveiliging hebben keer op keer bewezen de IT-productiviteit te verhogen. Naast dit alles was Juniper ook nog eens de eerste die 800G PTX-routers en een QFX-switch op de markt bracht. En ik ben enorm trots op wat Juniper allemaal heeft bereikt in 2024.

Wide Area Network 52

Wide Area Network WAN Routers Ethernet 52

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 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

JULY 20, 2018

Once NetFlow is enabled on a router or other network device, it tracks unidirectional statistics for each unique IP traffic flow, without storing any of the payload data carried in that session. Juniper MX and PTX series routers (via IPFIX). Alcatel-Lucent routers. Huawei routers. Cisco Catalyst switches. Flowmon probes.

Routers 40

Routers IP Address Protocol Server 40

Kentik

APRIL 18, 2016

sFlow, which has been available in switches and routers since 2001, is the brainchild of InMon Corporation, whose continued control over the protocol is both benevolent and absolute. sFlow, on the other hand, is based on interface counters and flow samples created by the network management software of each router or switch.

Protocol 40

Protocol Routers Encryption IP Address 40