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

DECEMBER 13, 2021

This is sort of a long shot, but are you using a corporate DNS server? You might try temporarily switching to a public DNS like Google’s 8.8.8.8. DNS lookups can introduce significant latency on new connections. Notice above that the routers used in the connection are looking pretty snappy.

Application 95

Application DNS Routers Server 95

Kentik

NOVEMBER 17, 2021

Kentik’s OTT Service Tracking (part of Kentik Service Provider Analytics) combines DNS queries with NetFlow to allow a user to understand exactly how OTT services are being delivered — an invaluable capability when trying to determine what is responsible for the latest traffic surge. OTT Service Tracking. How does OTT Service Tracking help?

DNS 99

DNS Port Routers Network 99

ByteByteGo

NOVEMBER 23, 2024

share one router with a single public IP address. When a device wants to access the internet, it sends a request to your router. The router’s NAT process replaces the private IP with the router’s public IP. In a corporate or home setting, multiple devices (phones, computers, etc.)

IP Address 100

IP Address Routers Internet Server 100

Kentik

OCTOBER 12, 2021

Some NPM vendors started pairing DNS lookup records with flow data in order to separate business applications from non-business applications hosted on the same IP address. The problem is that many companies have several DNS servers spread out in far-reaching locations, and not all DNS vendors allow access to the logs.

Encryption 84

Encryption DNS IP Address Protocol 84

Network Engineering

AUGUST 19, 2020

The problem is that when ESXi is down it takes down all the network with it, so I have to boot up another router to log in to it. default-router 10.0.0.1 dns-server 10.0.0.2 default-router 10.0.10.1 dns-server 10.0.0.2 default-router 10.0.20.1 dns-server 10.0.0.2 default-router 10.0.30.1

IP Address 52

IP Address DNS Routers Server 52

The Network DNA

JULY 9, 2024

Replacing cEdge in Cisco SDWAN environment Replacing the cEdge router with another cEdge through an RMA process for Cisco SDWAN , we need to put the basic configuration on the new RMA router and should be reachable via vManage. It is important that you should know the new router serial number should be learned to vManage NMS.

Routers 52

Routers IP Address MPLS WAN 52

Kentik

MARCH 13, 2023

We still need to connect our infrastructure to the public internet, so the enterprise WAN is still about routers, circuit IDs, and perimeter firewalls. But today, those routers are likely a centrally managed SD-WAN, and those perimeter firewalls could be a CASB or other cloud-based firewall service. So where are we today?

WAN 98

WAN Wide Area Network Topology Internet 98

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

Kentik

AUGUST 3, 2021

For example, some DevOps teams feel that AWS is more ideal for infrastructure services such as DNS services and load balancing. This is because much like an on-premises network, each cloud is a restricted network full of routers, switches and servers that can stretch the entire globe.

Cloud 124

Cloud Network Networking Gateway 124

Kentik

MAY 8, 2023

IP address abstraction and failover capabilities with DNS Domain Name System (DNS) is a system for mapping domain names to IP addresses. By using DNS, users can access a website or other service using a human-readable name without needing to remember the IP address.

Network 52

Network Networking IP Address TCP 52

Network Engineering

JANUARY 4, 2025

[I'm unsure whether this should be posted on Network Engineering, Server Faults or Android Enthusiasts] We have a hotspot service that connects into MikroTik routers, using the built-in hotspot facility. From a networking point of view, DNS is functional and there are no firewall entries that can restrict the traffic.

Firewall 52

Firewall DNS Gateway Routers 52

DoorDash Engineering

JANUARY 16, 2024

Internal Envoy routers allow communication between the global cell and replicated cells. Custom multi-cluster service discovery: Our custom service discovery solution, DoorDash data center Service Discovery, or DDSD, provides a custom DNS domain to support multi-cluster communication.

Cloud 84

Cloud IP Address DNS Routers 84

Kentik

JULY 8, 2019

It is the language spoken by routers to determine how packets can be sent from one router to another to reach their final destination. One way to think about it is that RPKI is to BGP what DNSSEC is to DNS. This method pairs routers with a server, which is aptly called a “validator”.

Routers 58

Routers Protocol Internet Advertising 58

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. The victim can update DNS to point at a different IP address in an attempt to get their application back up. The mitigation actually “completes the attack.”

IP Address 49

IP Address Port Routers DNS 49

Rule 11

JUNE 21, 2024

Our recent discovery in router firmware exposes a security flaw in routers Network Address Translation (NAT) mapping handling, which can be exploited by attackers to bypass TCPs built-in randomization.

Energy 40

Energy Routers Topology DNS 40

CATO Networks

JUNE 23, 2019

The infamous malware that crippled global DNS provider Dyn, French Web host OVH and security journalist Brain Krebs Web site with botnets of infected home routers, baby monitors and other IoT devices is now infecting enterprise network equipment, according to a recent Palo Alto Networks blog and Network Computing article.

IoT 52

IoT WAN Routers IP Address 52

Kentik

APRIL 24, 2023

Rather than collecting only flow data from routers, or only eBPF information from containers, the fact that application traffic traverses so many devices means we need much more data to get an accurate view of what’s happening. Some of these devices an enterprise network engineer owns and manages, and a lot of it they don’t.

Network 52

Network Networking DNS Data Centers 52

The Network DNA

NOVEMBER 26, 2024

10.10.10.100 inside NDNA-ASA(config)# dhcpd dns 112.110.112.5 Basic configurations on Cisco ASA Firewall - Part 2 As a part of the understanding on the basics of Cisco ASA firewalls, these are some of the commands used to configure Cisco ASA firewall in real scenario. NDNA-ASA(config)# dhcpd option 3 ip 10.10.10.1 255.255.255.0 255.255.255.0

Firewall 52

Firewall IP Address VPN Port 52

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 Network Networking Bandwidth 104

Kentik

FEBRUARY 13, 2017

This project took a feed of DNS data and performed a streaming analysis of flow data. Using source AS or DNS matching it was possible to detect the percent of traffic in a given network that was from CDNs as well as the cumulative (overlapping) percentage. It takes a lot of $24.99/month month subscribers to make that pay.

Routers 40

Routers DNS Protocol Engineering 40

Kentik

NOVEMBER 1, 2016

In the wake of the recent takedown of DNS provider Dyn, it’s common knowledge that Distributed Denial of Service (DDoS) attacks pose a serious and growing threat to the Internet and its component networks. The “black hole” part of RTBH refers to the fact that edge routers are typically provisioned with a static route (commonly 192.0.2.1)

Routers 40

Routers Network Networking DNS 40

Kentik

JANUARY 19, 2018

project to build cloud computing solutions (Pittsburgh Post-Gazette) Carnegie Mellon University (CMU) has a big investment in a new program “to build a smarter solution for edge devices — like a router or larger access point to a network — to operate on the cloud,” according to the Pittsburgh Post-Gazette. Carnegie Mellon is home to a $27.5M

Network 40

Network Networking Routers Artificial Intelligence 40

Network Engineering

MAY 7, 2023

So my question, Assuming there is no other device (router/server) that can be used as DDNS client. What I want, is obviously the value would be the Public IP of SNAT from the broadband modem not the private ip of palo alto interface. DDNS Configuration: DDNS Info: NoIP record: Our environment: PANOS 10.2.4 If it is, how to do it?

Internet 52

Internet Routers Server DNS 52

CATO Networks

NOVEMBER 18, 2018

When backhoes cut a wiring duct, squirrels chewed through wires, or router updates blew up the network, the MPLS provider was charged with fixing the problem. The carrier and providers who will monitor and manage your last miles are often limited to the capabilities of the edge device, namely the router.

WAN 52

WAN MPLS Routers DNS 52

Kentik

MARCH 28, 2016

To make it work, routers were equipped to read packet headers and use field values to group the packets. Later, users began wanting to add MPLS and other data that routers and switches could observe. What about capturing MAC address, or VLAN tag, or IPv6?

Protocol 40

Protocol Routers MPLS IP Address 40

AWS Architecture

OCTOBER 4, 2024

It allows them to route traffic across their containers as they grow, and perform health checks accordingly, and it provides Banfico customers access to the application workloads running on ROSA through the ROSA router layers. They can set up in minutes, and having custom routing policies help Banfico maintain compliance.

Banking 56

Banking Financial Application DNS 56

Kentik

DECEMBER 18, 2019

These include SNMP, DNS, RADIUS and streaming telemetry. 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 routing data is another important data source.

Server 13

Server Topology TCP Network 13

CATO Networks

JUNE 4, 2017

Redundant Provider Edge (PE) MPLS-enabled routers, switches, and other appliances were needed in each point-of-presence (PoP). Locations connecting to the UberNet, for example, are directed to the closest available PoP by DNS. With limited competition, providers had little incentive to reduce their fees.

MPLS 52

MPLS Internet Bandwidth WAN 52

Kentik

MARCH 6, 2017

The Akamai report identifies these top infrastructure attack vectors as UDP fragmentation, Domain Name Service (DNS) reflection, and Network Time Protocol (NTP) reflection. Incomplete baselining: - Per router/flow exporter (not network-wide); - Single dimension monitoring & alerting.

IoT 40

IoT DNS IP Address Server 40

CATO Networks

MARCH 23, 2017

The Mirai botnet that launched the DDOS attack DYNs DNS, for example, used home routers, cameras and other IOT devices. Its not just that our users increasingly work from the home. Its also that homes house new, more powerful devices that are being used to launch attacks against us.

Cloud 52

Cloud Network Networking Wide Area Network 52

CATO Networks

APRIL 19, 2017

Failover between lines with MPLS is based on DNS or route convergence, which takes too long to sustain a session. Bottom Line Conventional enterprise wide area networks are a hodge podges of routers, load balancers, firewalls, next generation firewalls (NGFW), anti-virus and more.

WAN 40

WAN MPLS Wide Area Network Firewall 40

Kentik

FEBRUARY 22, 2018

As an example of what can happen, the Mirai malware set loose in late 2016 created a botnet of IoT devices that included ordinary consumer devices such as security cameras, routers, and other home use IoT devices purposely designed to take websites and entire networks offline. The scale of the initial Mirai-based attack was eye-opening.

IoT 40

IoT Advertising Internet Network 40

Kentik

JANUARY 11, 2016

So now we can see that the UDP traffic is being sent to multiple ports, and it’s obvious that we’re experiencing a DNS redirection/amplification attack occurring on port 53, with a lot of port 0 UDP packet fragments being generated as collateral traffic. To see that, we go back to the Metrics menu and choose Destination » Port. Conclusion.

Port 40

Port Network Networking UDP port 40

Kentik

MARCH 27, 2017

To get an idea of how important effective protection can be, remember that by disabling just one digital dependency — the Dyn DNS service — hackers were recently able to shut down e-commerce for many of the industry’s most visible Web brands. Hackers can shut down Web revenues by disabling just one critical dependency.

Cloud 40

Cloud Internet Bandwidth Network 40

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

Kentik

JULY 28, 2021

Bad hardware (the switch or router port). Overwhelmed router. Congestion in the form of high-connection utilization or an overworked router in the path is another common source of trouble. TCP traceroute : A TCP trace reaches out to every router in the path to a target destination. Miss-matched duplexing (full vs. half).

Cloud 116

Cloud TCP Routers Protocol 116